ORCID Profile
0000-0003-0282-7960
Current Organisations
VA Northern California Health Care System
,
University of California Davis School of Medicine
,
Delft University of Technology
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Renewable Power and Energy Systems Engineering (excl. Solar Cells) | Energy Generation, Conversion and Storage Engineering | Computational Fluid Dynamics | Mechanical Engineering | Computational Heat Transfer | Electrical and Electronic Engineering | Database Management | Atmospheric Aerosols
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Engineering | Hydrogen-based Energy Systems (incl. Internal Hydrogen Combustion Engines) | Atmospheric Processes and Dynamics | Solid Oxide Fuel Cells | Energy Conservation and Efficiency in Transport | Solar-Photovoltaic Energy | Information Processing Services (incl. Data Entry and Capture) | Management of Greenhouse Gas Emissions from Transport Activities |
Related Links
Publications
Comments on two analyses of thermal non-equilibrium Darcy-Brinkman convection in cylindrical porous media
Publisher: Elsevier BV
Date: 11-2013
Investigation and simulation of the transport of gas containing mercury in microporous silica membranes
Publisher: Elsevier BV
Date: 11-2018
A perturbation solution for forced convection in a porous-saturated duct
Publisher: Elsevier BV
Date: 2008
Convective Heat Transfer in Porous Media
Publisher: CRC Press
Date: 06-11-2019
Water pool boiling in metal foams: From experimental results to a generalized model based on artificial neural network
Publisher: Elsevier BV
Date: 09-2021
Experimental study of crosswind effects on the performance of small cylindrical natural draft dry cooling towers
Publisher: Elsevier BV
Date: 02-2015
Performance evaluation of single tubular aluminium foam heat exchangers
Publisher: Elsevier BV
Date: 05-2014
Heatline and Energy-Flux-Vector Visualization of Natural Convection in a Porous Cavity Occupied by a Fluid with Temperature-Dependent Viscosity
Publisher: Begell House
Date: 2009
Conditional methods in modeling CO2 capture from coal syngas
Publisher: MDPI AG
Date: 27-03-2014
DOI: 10.3390/EN7041899
Structural improvement to accelerate the start-up process of natural draft dry cooling towers in dispatchable power plants
Publisher: Elsevier BV
Date: 11-2020
Nozzle arrangement effect on cooling performance of saline water spray cooling
Publisher: Elsevier BV
Date: 07-2016
Heat transfer and entropy generation for forced convection through a microduct of rectangular cross-section: Effects of velocity slip, temperature jump, and duct geometry
Publisher: Elsevier BV
Date: 11-2008
Estimation of pore size distribution of amorphous silica-based membrane by the activation energies of gas permeation
Publisher: MDPI AG
Date: 23-11-2018
DOI: 10.3390/PR6120239
Abstract: Cobalt oxide silica membranes were prepared and tested to separate small molecular gases, such as He (dk = 2.6 Å) and H2 (dk = 2.89 Å), from other gases with larger kinetic diameters, such as CO2 (dk = 3.47 Å) and Ar (dk = 3.41 Å). In view of the amorphous nature of silica membranes, pore sizes are generally distributed in the ultra-microporous range. However, it is difficult to determine the pore size of silica derived membranes by conventional characterization methods, such as N2 physisorption-desorption or high-resolution electron microscopy. Therefore, this work endeavors to determine the pore size of the membranes based on transport phenomena and computer modelling. This was carried out by using the oscillator model and correlating with experimental results, such as gas permeance (i.e., normalized pressure flux), apparent activation energy for gas permeation. Based on the oscillator model, He and H2 can diffuse through constrictions narrower than their gas kinetic diameters at high temperatures, and this was possibly due to the high kinetic energy promoted by the increase in external temperature. It was interesting to observe changes in transport phenomena for the cobalt oxide doped membranes exposed to H2 at high temperatures up to 500 °C. This was attributed to the reduction of cobalt oxide, and this redox effect gave different apparent activation energy. The reduced membrane showed lower apparent activation energy and higher gas permeance than the oxidized membrane, due to the enlargement of pores. These results together with effective medium theory (EMT) suggest that the pore size distribution is changed and the peak of the distribution is slightly shifted to a larger value. Hence, this work showed for the first time that the oscillator model with EMT is a potential tool to determine the pore size of silica derived membranes from experimental gas permeation data.
Impact of Particulate Deposition on the Thermohydraulic Performance of Metal Foam Heat Exchangers: A Simplified Theoretical Model
Publisher: ASME International
Date: 09-07-2012
DOI: 10.1115/1.4006272
Abstract: Assuming uniform particulate deposit layer, with deposition layer thickness in the range of 10–400 μm, on the ligaments of a metal foam heat sink, the effects of airborne particle deposition on the steady-state thermohydraulic performance of a metal foam heat sink are examined theoretically. Using a cubic cell model, changes in the foam internal structure, due to deposition, have been theoretically related to the increased pressure drop due to partial blockage of the pores. Our results suggest that the fouled to clean pressure drop ratio is only a function of the ligament to pore diameter ratio. Another interesting observation is that, compared to clean foams, the pressure drop can increase by orders of magnitude depending on the extent to which the pores are blocked. To examine the fouling effects on heat transfer from the foams, a thermal resistance network has been used. Moreover, the heat transfer from metal foams is more affected by fouling at higher fluid velocities. For ex le, when air is pushed through foams which their ligaments are uniformly covered by particles at 3 m/s, up to 15% decrease in the total heat transfer from the heated surface is predicted.
Comparative study on the cooling performance of evaporative cooling systems using seawater and freshwater
Publisher: Elsevier BV
Date: 2021
Thermal assessment of forced convection through metal foam heat exchangers
Publisher: ASME International
Date: 16-09-2011
DOI: 10.1115/1.4004530
Abstract: Using a thermal resistance approach, forced convection heat transfer through metal foam heat exchangers is studied theoretically. The complex microstructure of metal foams is modeled as a matrix of interconnected solid ligaments forming simple cubic arrays of cylinders. The geometrical parameters are evaluated from existing correlations in the literature with the exception of ligament diameter which is calculated from a compact relationship offered in the present study. The proposed, simple but accurate, thermal resistance model considers: the conduction inside the solid ligaments, the interfacial convection heat transfer, and convection heat transfer to (or from) the solid bounding walls. The present model makes it possible to conduct a parametric study. Based on the generated results, it is observed that the heat transfer rate from the heated plate has a direct relationship with the foam pore per inch (PPI) and solidity. Furthermore, it is noted that increasing the height of the metal foam layer augments the overall heat transfer rate however, the increment is not linear. Results obtained from the proposed model were successfully compared with experimental data found in the literature for rectangular and tubular metal foam heat exchangers.
Simulation of binary gas separation through multi-tube molecular sieving membranes at high temperatures
Publisher: Elsevier BV
Date: 02-2013
Slip flow forced convection in a microchannel with semi-circular cross-section
Publisher: Elsevier BV
Date: 02-2011
A theoretical analysis of forced convection in a porous-saturated circular tube: Brinkman–Forchheimer model
Publisher: Springer Science and Business Media LLC
Date: 02-12-2006
Advances in dry cooling for concentrating solar thermal (CST) power plants
Publisher: Elsevier
Date: 2017
Effects of Temperature-Dependent Viscosity on Forced Convection Inside a Porous Medium
Publisher: Springer Science and Business Media LLC
Date: 28-03-2008
A comparison between the wake behind finned and foamed circular cylinders in cross-flow
Publisher: Elsevier BV
Date: 2014
Scale-Up Design Analysis and Modelling of Cobalt Oxide Silica Membrane Module for Hydrogen Processing
Publisher: MDPI AG
Date: 05-08-2013
DOI: 10.3390/PR1020049
Comments on Flow, thermal, and entropy generation characteristics inside a porous channel with viscous dissipation by S. Mahmud and R.A. Fraser [Int. J. Thermal Sciences 44 (2005) 21-32]
Publisher: Elsevier BV
Date: 06-2007
Lattice Boltzmann Pore Scale Simulation of Natural Convection in a Differentially Heated Enclosure Filled with a Detached or Attached Bidisperse Porous Medium
Publisher: Springer Science and Business Media LLC
Date: 22-09-2016
Viscoelastic parameters of invasive breast cancer in correlation with porous structure and elemental analysis data
Publisher: Elsevier BV
Date: 11-2021
Influence of cascaded graphite foams on thermal performance of high temperature phase change material storage systems
Publisher: Elsevier BV
Date: 11-2020
A superposition approach to study slip-flow forced convection in straight microchannels of uniform but arbitrary cross-section
Publisher: Elsevier BV
Date: 07-2008
Solar-enhanced air-cooled heat exchangers for geothermal power plants
Publisher: MDPI AG
Date: 23-10-2017
DOI: 10.3390/EN10101676
Sensitivity analysis of design parameters for melting process of lauric acid in the vertically and horizontally oriented rectangular thermal storage units
Publisher: Elsevier BV
Date: 09-2022
Application of high porosity metal foams as air-cooled heat exchangers to high heat load removal systems
Publisher: Elsevier BV
Date: 08-2009
Comparative study on the performance of natural draft dry, pre-cooled and wet cooling towers
Publisher: Elsevier BV
Date: 04-2016
Optimization of adaptive metal foam arrangement in a heat storage tank
Publisher: Elsevier BV
Date: 10-2023
A novel vacuum discharge thermal energy combined desalination and power generation system utilizing R290/R600a
Publisher: Elsevier BV
Date: 03-2016
The cooling efficiency of s‐CO₂ microchannel heat sink compared with a water‐based design
Publisher: Wiley
Date: 18-07-2022
DOI: 10.1002/MMA.8535
Abstract: High‐pressure drops characteristic of microchannel heat sinks (MCHS) is an issue that needs to be addressed to reduce the size of heat‐removing devices in compact electronic devices. Supercritical carbon dioxide (s‐CO₂) is a suitable candidate being proposed as an alternative coolant to enhance the cooling of the microchannel heat sink (MCHS), with high heat flux, due to its favorable thermophysical properties near its critical point. In this study, numerical simulations are conducted to evaluate the thermal and hydraulic performance of a channel for a designed heat sink with s‐CO₂ (at constant ) and compare it with conventional liquid coolant (water). The effect of coolants mass flow rate ( ), channel aspect ratio (AR), and inlet temperatures on the thermal and hydraulic performance of one channel is studied by varying from 0.004 to 0.03 kg/s and AR from 0.33 to 10. The results show that, for the same aspect ratio, same geometry, and constant heat flux, s‐CO₂ offers a higher overall heat transfer coefficient (32%) with a lower friction factor (pumping power) compared with the water at the same inlet temperature (T = 32°C). The results of pumping power comparison between two coolants reveal that for CO₂ in supercritical conditions ( , T = 32°C), the consumed power varies by change of the aspect ratio, which is 1.85 times lower than water for AR = 0.33 and is 3.6 times higher for AR = 10. However, in the subcooled state, the reverse effect of the aspect ratio is seen.
Particulate Fouling and Challenges of Metal Foam Heat Exchangers
Publisher: Informa UK Limited
Date: 29-06-2016
Estimation of heat flux bifurcation at the heated boundary of a porous medium using a pore-scale numerical simulation
Publisher: Elsevier BV
Date: 04-2012
A comparative analysis on the shed vortices from the wake of finned, foam-wrapped cylinders
Publisher: IOP Publishing
Date: 23-06-2017
Production of Open-Cell Foam Using Additive Manufacturing Method and Porous Morphology Effects
Publisher: Springer Nature Singapore
Date: 2022
The fluid dynamic effect on the driving force for a cobalt oxide silica membrane module at high temperatures
Publisher: Elsevier BV
Date: 05-2014
Slip flow forced convection in a microporous duct of rectangular cross-section
Publisher: Elsevier BV
Date: 04-2009
Thermohydraulics of the liquid films in rotating heat pipes
Publisher: Emerald
Date: 07-06-2019
Abstract: In this study, closed-form solutions are presented to investigate thermohydraulics of liquid films in a rotating heat pipe. The film thickness is expressed as a function of flow rate. Further, sensitivity of both film thickness and flow rate to the length of the rotating heat pipe can now be investigated using the explicit expressions presented here. To make it easier for practical application, an approximate solution is presented on top of the exact solution. Both approximate and exact solutions are then applied to note that results are in good agreement when compared to those available in the literature.
Supercritical CO2 Radial Turbine Design Performance as a Function of Turbine Size Parameters
Publisher: ASME International
Date: 28-03-2017
DOI: 10.1115/1.4035920
Abstract: Supercritical CO2 (sCO2) cycles are considered as a promising technology for next generation concentrated solar thermal, waste heat recovery, and nuclear applications. Particularly at small scale, where radial inflow turbines can be employed, using sCO2 results in both system advantages and simplifications of the turbine design, leading to improved performance and cost reductions. This paper aims to provide new insight toward the design of radial turbines for operation with sCO2 in the 100–200 kW range. The quasi-one-dimensional mean-line design code topgen is enhanced to explore and map the radial turbine design space. This mapping process over a state space defined by head and flow coefficients allows the selection of an optimum turbine design, while balancing performance and geometrical constraints. By considering three operating points with varying power levels and rotor speeds, the effect of these on feasible design space and performance is explored. This provides new insight toward the key geometric features and operational constraints that limit the design space as well as scaling effects. Finally, review of the loss break-down of the designs elucidates the importance of the respective loss mechanisms. Similarly, it allows the identification of design directions that lead to improved performance. Overall, this work has shown that turbine design with efficiencies in the range of 78–82% is possible in this power range and provides insight into the design space that allows the selection of optimum designs.
Performance analysis of a low pressure discharge thermal energy combined desalination unit
Publisher: Elsevier BV
Date: 02-2015
An investigation on spray cooling using saline water with experimental verification
Publisher: Elsevier BV
Date: 2016
Natural draft dry cooling tower modelling
Publisher: Springer Science and Business Media LLC
Date: 18-09-2013
Heat and fluid flow in a rectangular microchannel filled with a porous medium
Publisher: Elsevier BV
Date: 12-2008
Numerical investigation of swirl effects on a short natural draft dry cooling tower under windless and crosswind conditions
Publisher: Elsevier BV
Date: 04-2021
Periodic structures for melting enhancement: observation of critical cell size and localized melting
Publisher: Elsevier BV
Date: 10-2022
Slip flow forced convection through microducts of arbitrary cross-section: Heat and momentum analogy
Publisher: Elsevier BV
Date: 02-2016
Particle size distribution effects on preferential deposition areas in metal foam wrapped tube bundle
Publisher: Elsevier BV
Date: 12-2014
CFD analyses for the development of an innovative latent thermal energy storage for food transportation
Publisher: Elsevier BV
Date: 02-2023
Numerical Study of Turbulent Convective in Upward Flows of Supercritical Water in the Triangular Lattice Fuel Rod Bundle
Publisher: American Society of Mechanical Engineers
Date: 03-08-2014
Abstract: Convection heat transfer in upward flows of supercritical water in triangular tight fuel rod bundles is numerically investigated by using the commercial CFD code, ANSYS Fluent© 14.5. The fuel rod with an inner diameter of 7.6 mm and the pitch-to-diameter ratio (P/D) of 1.14 is studied for mass flux ranging between 550 and 1050 kg/m2s and heat flux of 560 kW/m2 at pressures of 25 MPa. V2F eddy viscosity turbulence model is used and, to isolate the effect of buoyancy, constant values are used for thermo-physical properties with Boussinesq approximation for the density variation with temperature in the momentum equations. The computed Nusselt number normalized by that of the same Reynolds number with no buoyancy against the buoyancy parameter proposed by Jackson and Hall’s criterion. Mentioned results are compared with V2F turbulence model whereas strong nonmonotonic variation of the thermo-physical properties as function of temperature have been applied to the commercial CFD code using user defined function (UDF) technique. A significant decrease in Nusselt number was observed in the range of 10-6 Grq/Reb3.425Prb0.8 ×10-6 before entering a serious heat transfer deterioration regime. Based on an analysis of the shear-stress distribution in the turbulent boundary layer and the significant variation of the specific heat across the turbulent boundary layer, it is found that the same mechanism that leads to impairment of turbulence production in concentric annular pipes is present in triangular lattice fuel rod bundles at supercritical pressure.
A novel method to predict the transient start-up time for natural draft dry cooling towers in dispatchable power plants
Publisher: Elsevier BV
Date: 12-2019
Forced Response Analysis of Supercritical CO2 Radial Inflow Turbine Designed for Concentrating Solar Power
Publisher: American Society of Mechanical Engineers
Date: 13-06-2016
DOI: 10.1115/GT2016-58144
Abstract: The forced response of high-pressure sCO2 radial-inflow turbine blisk is studied with regards to internal mistuning and inherent characteristics of supercritical Brayton cycle. A novel preliminary meanline analysis led to the generation of turbine designs for the sCO2 Brayton cycle with respect to concentrating solar power (CSP) applications. Details of mentioned study are published in a separate paper. The sCO2 turbine with a pressure ratio of 2.2 and the mild inlet temperature of 560 C is studied for rotational speed ranging between 75000 and 125000 RPM. Aiming to achieve an enhanced understanding of the fluid-structure-interaction in sCO2 radial-inflow turbine, a numerical method capable of predicting the forced responses of tuned and intentionally mistuned blisks due to aerodynamic excitation is presented. The numerical work involves the simulation of the transient flow field, and then the unsteady aerodynamic excitation forces on the blades are determined by modelling various resonance condition, including the influence of the operating condition and stator number. Performing the forced response of the structure, the transient and spatially resolved pressure distribution is used as a boundary condition in an FE model. As a result, the response lifications of sCO2 turbines are eventually compared. The similar geometrical turbine was designed and manufactured to be operated in subcritical state for the sake of validation. The results of the subcritical turbine are derived by means of experimental and numerical analyses. To update the effect of mistuning in the FE model, blade by blade measurements using the ex le of a subcritical turbine blisk is performed and results of well correlated FRFs are used as inputs to adjust the blade in idual Young’s modulus. The tendency of results is approved by previous works done in subcritical state. The structural d ing information to be considered in the update process is taken from results of an experimental modal analysis and the aerodynamic d ing induced by blade vibration is computed using an energy balance technique. It has been found that increase of the maximum forced response beyond that of the sCO2 turbine with higher rotational speed is not significant due to the existence of high pressure-density sCO2. This implies an occurrence of high aerodynamic d ing which would cause a low vibrational litude in case of a mistuned blisk. Considering aeroelastic coupling, in supercritical turbine with small mistuning, no change of maximum response magnitudes is achieved for the fundamental bending mode however, with large mistuning pattern, aerodynamic d ing can cause significantly better response level. This result indicates considerable contrast with responses obtained from subcritical model which would be expressed by either characteristic or state of working fluid.
A review on the performance evaluation of natural draft dry cooling towers and possible improvements via inlet air spray cooling
Publisher: Elsevier BV
Date: 11-2017
Heat and fluid flow in entrance region of a channel with staggered baffles
Publisher: Elsevier BV
Date: 09-2006
Heat transfer enhancement from a blade tip-cap using metal foams
Publisher: ASME International
Date: 28-09-2012
DOI: 10.1115/1.4007134
Abstract: 3D numerical results are presented to compare the heat transfer augmentation from a plate by using pin fins and metal foams. It is observed that maximizing the inlet velocity and pores per inch maximizes the overall heat transfer rate. The thickness of the foam layer has minimal effect on overall rates of heat transfer, but great effect on the maximum plate temperature. It has been shown that an optimum thickness exists which minimizes the hot spot temperature. Hot spots are generally located in the corners where velocities are the lowest. While the pressure drop remains almost unaltered, the heat transfer increases by 146% and 12% compared with a smooth channel and the optimal pin-fin data available in the literature, respectively. Interestingly, the additional mass of the foams, to achieve this performance, is approximately one-quarter of the best pin-fin sink quoted above.
Conditional methods in modeling CO2 capture from coal syngas
Publisher: MDPI AG
Date: 31-03-2014
DOI: 10.3390/EN7042051
Water pool boiling across low pore density aluminum foams
Publisher: Informa UK Limited
Date: 16-08-2019
Particle deposition effects on heat transfer from a metal foam-wrapped tube bundle
Publisher: Emerald
Date: 04-01-2013
DOI: 10.1108/09615531311289114
Abstract: The purpose of this paper is to clarify the relationship between dust deposition effects on the thermohydraulic performance of a metal foam heat exchanger. The paper uses finite volume approximation to solve the two‐dimensional volume‐averaged form of governing equations through and around a metal foam‐covered tube bundle. Modified porosity, permeability, and form drag coefficient for a dusty foam layer are obtained through the application of a thermal resistance network model. The paper provides novel data to predict the fouling effects on the performance of foam‐wrapped tube bundles as air‐cooled heat exchangers. It is observed that depending on the deposited layer thickness, the increased pressure drop and heat transfer deterioration can be very significant. This paper fulfils an identified need to study fouling effects on thermohydraulic performance of a foam heat exchanger.
Influence of solder condition on effective thermal conductivity of two-directional random fibres: Pore-scale simulation
Publisher: Elsevier BV
Date: 03-2023
Effects of viscous dissipation on thermally developing forced convection in a porous saturated circular tube with an isoflux wall
Publisher: Springer Science and Business Media LLC
Date: 05-2006
Scaling effects for flow in micro-channels: Variable property, viscous heating, velocity slip, and temperature jump
Publisher: Elsevier BV
Date: 02-2009
Pore-Scale Numerical Experiment on the Effect of the Pertinent Parameters on Heat Flux Splitting at the Boundary of a Porous Medium
Publisher: Springer Science and Business Media LLC
Date: 02-05-2013
A perturbation based analysis to investigate forced convection in a porous saturated tube
Publisher: Elsevier BV
Date: 2004
Thermal performance assessment of a thermal energy storage tank: effect of aspect ratio and tilted angle
Publisher: Hindawi Limited
Date: 08-03-2021
DOI: 10.1002/ER.6598
Development of Decision-Making Tool and Pareto Set Analysis for Bi-Objective Optimization of an ORC Power Plant
Publisher: MDPI AG
Date: 12-10-2020
DOI: 10.3390/EN13205280
Abstract: Power plants based on organic Rankine cycle (ORC) are known for their capacity in converting low and medium-temperature energy sources to electricity. To find the optimal operating conditions, a designer must evaluate the ORC from different perspectives including thermodynamic performance, technological limits, economic viability, and environmental impact. A popular approach to include different criteria simultaneously is to formulate a bi-objective optimization problem. This type of multi-objective optimization (MOO) allows for finding a set of optimal design points by defining two different objectives. Once the optimization is completed, the decision-making analysis shall be carried out to identify the final design solution. This study aims to develop a decision-making tool for facilitating the choice of the optimal design point. The proposed procedure is coded in MATLAB based on the commonly used Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). By providing the capability to graphically identify the decisions taken, the tool developed in the study is called Tracking and Recognizing Alternative Design Solutions (TRADeS). Analysis of our data shows that certain regions of Pareto set points should be excluded from the design space. It was noted that in these regions a high rate at which one of the objectives moves away from its ideal value coincides with a low rate at which the second criterion approaches its ideal solution. Hence, it was recommended that the criteria weights corresponding to excluded regions of the Pareto set should be discarded when selecting the final design point. By comparing the results obtained using the proposed model to those of existing decision-making techniques, it was concluded that while the known approaches are appropriate for an easy and fast selection of the final design point, the presented procedure allows for a more comprehensive and well-rounded design. It was shown that our design tool can be successfully applied in the decision-making analysis for problems that aim at optimizing the ORC using two design criteria. Finally, the proposed software benefits from a generic structure and is easy to implement which will facilitate its use in other industrial applications.
Simulations of melting performance enhancement for a PCM embedded in metal periodic structures
Publisher: Elsevier BV
Date: 04-2021
Thermal storage based on phase change materials (PCMs) for refrigerated transport and distribution applications along the cold chain
Publisher: Elsevier BV
Date: 11-2022
A study on multi-nozzle arrangement for spray cooling system in natural draft dry cooling tower
Publisher: Elsevier BV
Date: 09-2017
Special Section on Flow Physics of Supercritical Fluids in Engineering
Publisher: ASME International
Date: 18-01-2021
DOI: 10.1115/1.4049402
Asymptotic approximations for swirling turbulent plume rising from circular sources
Publisher: American Physical Society (APS)
Date: 10-09-2021
Effects of viscous dissipation and boundary conditions on forced convection in a channel occupied by a saturated porous medium
Publisher: Springer Science and Business Media LLC
Date: 12-12-2006
Entropy generation for forced convection in a porous channel with isoflux or isothermal walls
Publisher: Inderscience Publishers
Date: 2008
LATTICE BOLTZMANN METHOD FOR SIMULATING CONJUGATE HEAT TRANSFER FROM AN OBSTACLE MOUNTED IN A PARALLEL-PLATE CHANNEL WITH THE USE OF THREE DIFFERENT HEAT INPUT METHODS
Publisher: Begell House
Date: 2012
Combustion Air Humidification for NOx Emissions Reduction in Gas Boiler: An Experimental Study
Publisher: Informa UK Limited
Date: 02-2023
Thermal Analysis of Flow in a Porous Medium Over a Permeable Stretching Wall
Publisher: Springer Science and Business Media LLC
Date: 20-05-2010
Heat Transfer in Saline Water Evaporative Cooling
Publisher: Informa UK Limited
Date: 16-02-2019
A novel hybrid geo-solar thermal design for power generation in Australia
Publisher: Elsevier BV
Date: 07-2021
Numerical analysis of multiple phase change materials based heat sink with angled thermal conductivity enhancer
Publisher: Elsevier BV
Date: 11-2022
Performance of tubular aluminum foam heat exchangers in multiple row bundles
Publisher: Springer Science and Business Media LLC
Date: 17-05-2019
Natural Convection in a Nanofluids-Filled Portioned Cavity: The Lattice-Boltzmann Method
Publisher: Informa UK Limited
Date: 02-03-2011
Investigation of large-scale structures behind a single tube (finned and foamed tube) using two-point correlations
Publisher: American Society of Mechanical Engineers
Date: 03-08-2014
Abstract: Flow structures downstream of a finned-tube are compared to those of an identical pipe with the same diameter and length, covered with a foam layer. The standard case of cross-flow over a bare tube, i.e. no surface extension, is also tested as a benchmark. Experiments are conducted in a wind tunnel at Reynolds numbers of 4000 and 16000. Particle image velocimetry (PIV) was used for flow visualization on two different perpendicular planes. To characterize the size of the flow structures downstream of the tube, for each of the aforementioned case, two-point correlation, as a statistical analysis tool, has been used. It has been observed that by decreasing the Reynolds number, the flow structures are further stretched in streamwise direction for both bare and finned-tube cases. This is, however, more pronounced with the former. Interestingly, with a foam-wrapped tube the sizes of the flow structures are found to be independent of the Reynolds number. Finally, the structure sizes are smaller in the case of the foam-wrapped tube compared to those of finned-tube.
CFD Convective Flow Simulation of the Varying Properties of CO2-H2O Mixtures in Geothermal Systems
Publisher: Hindawi Limited
Date: 2015
DOI: 10.1155/2015/843068
Abstract: Numerical simulation of a geothermal reservoir, modelled as a bottom-heated square box, filled with water-CO 2 mixture is presented in this work. Furthermore, results for two limiting cases of a reservoir filled with either pure water or CO 2 are presented. Effects of different parameters including CO 2 concentration as well as reservoir pressure and temperature on the overall performance of the system are investigated. It has been noted that, with a fixed reservoir pressure and temperature, any increase in CO 2 concentration leads to better performance, that is, stronger convection and higher heat transfer rates. With a fixed CO 2 concentration, however, the reservoir pressure and temperature can significantly affect the overall heat transfer and flow rate from the reservoir. Details of such variations are documented and discussed in the present paper.
Numerical investigation of temperature-dependent viscosity variation effects on thermally developing forced convection through a porous medium
Publisher: Begell House
Date: 2007
On the modelling of heat and fluid transport in fibrous porous media: Analytical fractal models for permeability and thermal conductivity
Publisher: Elsevier BV
Date: 02-2022
A computationally derived heat transfer correlation for in-tube cooling turbulent supercritical CO2
Publisher: Elsevier BV
Date: 04-2019
Investigation of the effect of thermal resistance on the performance of phase change materials
Publisher: Elsevier BV
Date: 06-2021
Theoretical and numerical investigations of swirl enhanced short natural draft dry cooling towers
Publisher: Elsevier BV
Date: 11-2020
Selection of wetted media for pre-cooling of air entering natural draft dry cooling towers
Publisher: Elsevier BV
Date: 03-2017
Solid–Liquid Thermal Energy Storage
Publisher: CRC Press
Date: 13-04-2022
Air-cooled micro-porous heat exchangers for thermal management of fuel cells
Publisher: Elsevier BV
Date: 03-2012
Advances in Thermal Engineering through Computational Heat and Mass Transfer: Selected papers from ICCHMT 2018, Cracow (Poland)
Publisher: Elsevier BV
Date: 05-2019
Numerical investigation of the influence of local effects on the transient start-up process of natural draft dry cooling towers in dispatchable power plants
Publisher: Elsevier BV
Date: 04-2019
Numerical and experimental study on the spray characteristics of full-cone pressure swirl atomizers
Publisher: Elsevier BV
Date: 10-2018
A detailed model of direct dry-cooling for the supercritical carbon dioxide Brayton power cycle
Publisher: Elsevier BV
Date: 12-2019
Low grade heat driven multi-effect distillation technology
Publisher: Elsevier BV
Date: 12-2011
Experimental analysis of heat transfer of supercritical fluids in plate heat exchangers
Publisher: Elsevier BV
Date: 07-2014
Dry cooling towers as condensers for geothermal power plants
Publisher: Elsevier BV
Date: 11-2010
An Investigation on Cooling Performance of Air-Cooled Heat Exchangers Used in Coal Seam Gas Production
Publisher: Informa UK Limited
Date: 13-09-2017
A new automatic spark generation system for gasoline engines
Publisher: IEEE
Date: 03-2016
Eulerian–Lagrangian analysis of solid particle distribution in an internally heated and cooled air-filled cavity
Publisher: Elsevier BV
Date: 2015
Forced convection through a hyperporous duct with internal heating/cooling effects
Publisher: Begell House
Date: 2003
Analytical solution of forced convection in a duct of rectangular cross section saturated by a porous medium
Publisher: ASME International
Date: 16-12-2006
DOI: 10.1115/1.2188510
Abstract: A theoretical analysis is presented to investigate thermally and hydrodynamically fully developed forced convection in a duct of rectangular cross section filled with a hyper-porous medium. The Darcy-Brinkman model was adopted in the present analysis. A Fourier series type solution is applied to obtain the exact velocity and temperature distribution within the duct. The case of uniform heat flux on the walls, i.e., the H boundary condition in the terminology of Kays and Crawford (1993, Convective Heat and Mass Transfer, 3rd ed., McGraw-Hill, NY), is treated. Values of the Nusselt number and the friction factor as a function of the aspect ratio, the Darcy number, and the viscosity ratio are reported.
Cooling performance of solid containing water for spray assisted dry cooling towers
Publisher: Elsevier BV
Date: 02-2015
Numerical study on cooling heat transfer of turbulent supercritical CO2 in large horizontal tubes
Publisher: Elsevier BV
Date: 11-2018
Cavitation in Diesel Fuel Injector Nozzles and its Influence on Atomization and Spray
Publisher: Wiley
Date: 20-11-2019
Effects of temperature-dependent viscosity on Bénard convection in a porous medium using a non-Darcy model
Publisher: Elsevier BV
Date: 03-2008
Techno‐economic analysis of a hybrid solar‐geothermal power plant integrated with a desalination system
Publisher: Hindawi Limited
Date: 08-06-2021
DOI: 10.1002/ER.6948
Effect of buoyancy on turbulent convection heat transfer in corrugated channels – A numerical study
Publisher: Elsevier BV
Date: 09-2013
Spray cooling system design and optimization for cooling performance enhancement of natural draft dry cooling tower in concentrated solar power plants
Publisher: Elsevier BV
Date: 02-2019
Enhanced Double-Pass Solar Air Heater With and Without Porous Medium
Publisher: Informa UK Limited
Date: 08-2011
Computational fluid dynamics applied to high temperature hydrogen separation membranes
Publisher: Springer Science and Business Media LLC
Date: 17-02-2012
Comments on Effects of viscous dissipation on the heat transfer in forced pipe flow. Part 1: Both hydrodynamically and thermally fully developed flow [Energy Conv. Manage. 2005; 46: 757-769] and Part 2: Thermally developing flow [Energy Conv. Manage. 2005; 46: 3091-3202] by O. Aydin
Publisher: Elsevier BV
Date: 11-2006
Theoretical Analysis of Natural Convection in an Enclosure Filled with Disconnected Conducting Square Solid Blocks
Publisher: Springer Science and Business Media LLC
Date: 24-04-2010
Heat transfer enhancement in phase change materials for thermal energy storage in concentrated solar power plants
Publisher: The University of Queensland
Date: 11-12-2020
DOI: 10.14264/ADD80CC
Multi-objective analysis of an influence of a geothermal water salinity on optimal operating parameters in low-temperature ORC power plant
Publisher: Elsevier BV
Date: 07-2020
Comments on Viscous-dissipation effects on the heat transfer in a Poiseuille flow by O. Aydin and M. Avci
Publisher: Elsevier BV
Date: 2008
The crosswind effects on the start-up process of natural draft dry cooling towers in dispatchable power plants
Publisher: Elsevier BV
Date: 06-2019
A Theoretical Model with Experimental Verification to Predict Hydrodynamics of Foams
Publisher: Springer Science and Business Media LLC
Date: 30-10-2013
Turbulent heat transfer and nanofluid flow in an annular cylinder with sudden reduction
Publisher: Springer Science and Business Media LLC
Date: 21-03-2020
Application of metal foams in air-cooled condensers for geothermal power plants: An optimization study
Publisher: Elsevier BV
Date: 08-2011
Thermal performance and mechanisms of soot deposition in foam structured exhaust gas recirculation coolers
Publisher: Elsevier BV
Date: 12-2019
Computational investigations on convective flow and heat transfer of turbulent supercritical CO2 cooled in large inclined tubes
Publisher: Elsevier BV
Date: 08-2019
An Experimental Facility to Validate Ground Source Heat Pump Optimisation Models for the Australian Climate
Publisher: MDPI AG
Date: 22-01-2017
DOI: 10.3390/EN10010138
Entropy generation for microscale forced convection: Effects of different thermal boundary conditions, velocity slip, temperature jump, viscous dissipation, and duct geometry
Publisher: Elsevier BV
Date: 10-2007
Modeling traffic jams in intracellular transport in axons
Publisher: Elsevier BV
Date: 11-2008
Experimental investigation on a novel arrangement of wet medium for evaporative cooling of air,Étude expérimentale sur une nouvelle configuration de support humide pour le refroidissement par évaporation de l'air
Publisher: Elsevier BV
Date: 04-2021
Thermal characteristics of melting of a phase change material enhanced by a stainless-steel 304 periodic structure
Publisher: Elsevier BV
Date: 06-2023
Energy flux vectors as a new tool for convection visualization
Publisher: Emerald
Date: 30-03-2010
DOI: 10.1108/09615531011016984
Abstract: The aim of this paper is to introduce a new technique for convection visualization. This is similar to Bejan's heatlines and is even an exact match to Landau and Lifshitz's energy streamlines for two‐dimensional geometries. The work benefits from a combination of numerical and analytical tools to show that, in two‐dimensional space, heatlines and energy streamlines are effectively the same. More importantly, the energy flux vectors are tracing both of them accurately as verified for some cases of free and forced convection problems in this paper. The new technique is easier to implement compared to the existing counterparts which are available in the literature. More specifically, the advantage of this new technique is that, contrary to heatlines and energy streamlines, it does not require further numerical analysis in addition to solving momentum and energy equations. Energy flux vectors offer higher resolution compared to existing visualization tools.
On numerical study of calcium sulphate fouling under sub-cooled flow boiling conditions
Publisher: Elsevier BV
Date: 04-2015
Thermal dispersion effects on forced convection in a parallel plate porous channel
Publisher: Springer Science and Business Media LLC
Date: 24-03-2015
The analysis of the wake behind a foamed and a finned cylinder
Publisher: ACTAPRESS
Date: 2013
The Hazen-Dupuit-Darcy model for investigation of viscous dissipation effects on thermal development of a liquid-metal flow in a porous medium: Circular tube with uniform wall temperature
Publisher: Begell House
Date: 2004
Experimental Investigation on Spray Cooling Using Saline Water
Publisher: Springer Science and Business Media LLC
Date: 2019
Numerical simulation of a supercritical CO2 geothermosiphon
Publisher: Elsevier BV
Date: 12-2010
Numerical study of the transient behaviour of a thermal storage module containing phase-change material
Publisher: SAGE Publications
Date: 25-03-2010
Abstract: In this paper, the transient behaviour of a thermal storage module is studied numerically based on the enthalpy transforming method. The module is composed of a concentric tube, in which the annulus contains the phase-change material (PCM) and the inner tube carries the heat transfer fluid. The full set of governing equations accounting for heat and fluid flow in the inner tube, the change of phase of the PCM in the annulus, and heat conduction in the walls are solved simultaneously as a conjugate problem. A parametric study, based on three different PCMs, one with hypothetical constant properties and the other two with variable properties, is conducted to investigate the effects of outer wall thickness and variable thermo-physical properties of the PCM on the performance of the storage module during the phase-change process. It is observed that property variation effects become more pronounced as the Stefan number increases. Interestingly, more latent heat can be stored at a given time as the thermal diffusivity ratio is increased for both constant and variable property cases. This can prevent the over-sizing of the system based on constant property data. Another feature of considerable interests is the delay in the charging time: the time required for the PCM to store a certain amount of energy when the wall thermal resistance is included. A s le set of predicted data shows an error of at least 22 and/or 7.7 per cent when the property variation and/or wall thermal resistance is neglected, respectively.
Review of printed circuit heat exchangers and its applications in solar thermal energy
Publisher: Elsevier BV
Date: 03-2022
Selected Papers from the 1st International Conference on Nanofluids (ICNf)
Publisher: Informa UK Limited
Date: 22-09-2020
Numerical simulation of laminar to turbulent nanofluid flow and heat transfer over a backward-facing step
Publisher: Elsevier BV
Date: 07-1970
Transient natural convection: scale analysis of dry cooling towers
Publisher: Springer Science and Business Media LLC
Date: 30-11-2020
Entropy-energy analysis of forced convection in a porous-saturated circular tube considering temperature-dependent viscosity effects
Publisher: Inderscience Publishers
Date: 2006
CFD modeling of asphaltene deposition rate from crude oil
Publisher: Elsevier BV
Date: 04-2015
Metal foam heat exchangers for thermal management of fuel cell systems
Publisher: AIP
Date: 2011
DOI: 10.1063/1.4711182
Theoretical and experimental studies on a solid containing water droplet
Publisher: Elsevier BV
Date: 11-2014
Analysis of heat transfer and entropy generation for a thermally developing Brinkman-Brinkman forced convection problem in a rectangular duct with isoflux walls
Publisher: Elsevier BV
Date: 10-2007
Effect of CO2-based binary mixtures on the performance of radial-inflow turbines for the supercritical CO2 cycles
Publisher: Elsevier BV
Date: 03-2023
Effects of porosity changes on the self-heating characteristics of coal stockpiles
Publisher: Begell House
Date: 2012
Combined Functional Task Practice and Dynamic High Intensity Resistance Training Promotes Recovery of Upper-extremity Motor Function in Post-stroke Hemiparesis
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 09-2006
DOI: 10.1097/01.NPT.0000281945.55816.E1
Abstract: Weakness is a significant impairment in persons with post-stroke hemiparesis, yet traditional clinical perspectives caution against strengthening in neurological populations. Significant correlations between weakness and functional movement have been demonstrated, however, a clear relationship between increased strength and functional improvement has been elusive. This case study describes a combined program of dynamic, high-intensity resistance training and functional task practice for the upper-extremity in adult hemiparesis. The patient was a 65-year-old, right hand dominant woman who presented to the Neural Control of Movement Laboratory at the Palo Alto VA Rehabilitation Research and Development Center 16 weeks following clipping of an unruptured aneurysm with consequent dense right hemiparesis. She received 7 weeks of acute rehabilitation according to CARF guidelines (ie, at least 3 hours of two or more disciplines, 6 days per week). Her baseline research evaluation revealed significant upperextremity deficits at the ICF body structure/function level including: weakness, shoulder pain, mild resistance to passive movement, and need for moderate to maximal assistance in many activities of daily living including bathing and dressing. The Stroke Impact Scale score reporting her perspective indicated she had recovered from her stroke only 50%. The hybrid resistance training-functional task practice intervention, detailed in this report, was delivered 3 times per week for 6 weeks with each session lasting 75:00. The subject revealed marked improvements in isometric and dynamic force production in 5 key upper-extremity actions: elbow flexion, elbow extension, shoulder flexion, shoulder abduction, and shoulder external rotation. Strength gains were accompanied by increased EMG activation immediately postintervention and by a combination of increased activation and apparent hypertrophic effects at 6 month follow up. Marked improvements were noted in all clinical and functional measures and in an elbow trajectorytracking task which served as a surrogate measure of motor control. Improvements in strength and positive outcome effects at the physiological, clinical, and functional levels were observed in this subject following the experimental hybrid upper-extremity rehabilitation intervention described. Importantly, no deleterious effects were observed including exacerbation of spasticity or musculoskeletal compromise. Observations of improved EMG activation in this case study suggest that improvements in motor activation underlie these strength gains and can likely be attributed to working at a high intensity level.
Experimental analysis of phase change phenomenon of paraffin waxes embedded in copper foams
Publisher: Elsevier BV
Date: 04-2015
Numerical investigation of flow and heat transfer of a liquid metal in a compact heat exchanger
Publisher: Begell House
Date: 2004
Experimental and numerical analysis of transient heat transfer from inclined tube bundles
Publisher: Springer Science and Business Media LLC
Date: 14-06-2020
Hydrodynamic modeling of traffic jams in intracellular transport in axons
Publisher: Elsevier BV
Date: 04-2009
Metal foams as gas coolers for exhaust gas recirculation systems subjected to particulate fouling
Publisher: Elsevier BV
Date: 06-2016
CFD modeling of the building integrated with a novel design of a one-sided wind-catcher with water spray
Publisher: Elsevier BV
Date: 10-2022
Theory of dynamical cavitation threshold for diesel fuel atomization
Publisher: IOP Publishing
Date: 08-2022
Abstract: Theory of dynamical cavitation threshold for vapor and non-condensable gas bubble nuclei is proposed based on a model equation constructed from Rayleigh–Plesset equation for glycerol, the liquid with viscosity higher than that of water by 1500 times, under a finite duration of strong tension. The model equation is ascertained to be valid in cases of strong tension under which cavitation occurs. Our model enables the study of dynamics of nuclei on the phase plane of the nucleus radius and the growth velocity, by which the full details of the threshold are revealed. We propose a dimensionless parameter to be used to classify the threshold of cavitation. Our model offers a simple mathematical expression to calculate the maximum radii attained, while under tension, for each of these three recognized patterns. For each observed pattern, we present unique predictive correlations for the radius of the nucleus growing for the tension duration. Moreover, we elucidate that the dynamics of the nuclei, grown up to certain sizes, is fully controlled by tension independent of the viscosity. The discrepancy between the dynamical threshold and the conventional Blake’s threshold is discussed. Finally, the utility of the theory presented here is demonstrated through numerical ex les.
Long term and performance testing of NaMg double salts for H 2 /CO 2 separation
Publisher: Elsevier BV
Date: 03-2017
Moderate Reynolds number flow through microchannels filled with arrays of micro-cylinders
Publisher: AIP
Date: 2012
DOI: 10.1063/1.4711157
Performance evaluation of tubular aluminum foam heat exchangers in single row arrays
Publisher: Elsevier BV
Date: 05-2015
Effect of a discrete heat source location on entropy generation in mixed convective cooling of a nanofluid inside the ventilated cavity
Publisher: Inderscience Publishers
Date: 2013
Theoretical prediction with numerical and experimental verification to predict crosswind effects on the performance of cooling towers
Publisher: Informa UK Limited
Date: 24-10-2015
Water Pool boiling on Aluminum Metal Foams
Publisher: IOP Publishing
Date: 08-2020
DOI: 10.1088/1742-6596/1599/1/012012
Abstract: With current growth in electronic systems, their physical sizes decrease, and the spacing between components decreases, both the total amount of heat generated and the power density increase significantly. There is a general agreement in the scientific community that current air-cooling technologies are asymptotically approaching their intrinsic limits. Pool boiling is widely used in many different engineering systems, but most of these applications have a common limitation: the maximum heat flux that can be rejected by the cooling systems under safe, reliable, and efficient operation. In this paper experimental data pertinent to deionized water pool boiling across 10 mm thick aluminum foams are presented. Three foam s les with different pore densities, 5, 10, and 40 PPI, yet with an identical mean porosity of 0.92 are tested. Compared to a heated flat plate, the foams offer higher heat transfer area albeit at induced bubble escaping resistance. The tradeoff between these two effects is investigated. Through the use of high speed video camera recording, bubble generation, trajectory and growth rate were analyzed and critically discussed.
Theoretical analysis of coal stockpile self-heating
Publisher: Elsevier BV
Date: 07-2014
Effects of viscous heating, fluid property variation, velocity slip, and temperature jump on convection through parallel plate and circular microchannels
Publisher: Elsevier BV
Date: 2010
Optimised exergy efficiency of a combined flash spray desalinator recovering discharge thermal energy
Publisher: Informa UK Limited
Date: 07-10-2016
Experimental study of film media used for evaporative pre-cooling of air
Publisher: Elsevier BV
Date: 11-2014
Second-law analysis of thermally developing forced convection in a porous medium
Publisher: Begell House
Date: 2005
Enhanced heat transfer in a pyramidal lattice sandwich panel by introducing pin-fins/protrusions/dimples
Publisher: Elsevier BV
Date: 10-2020
Phase change behaviour study of PCM tanks partially filled with graphite foam
Publisher: Elsevier BV
Date: 09-2021
Comparison of the Finite Volume and Lattice Boltzmann Methods for Solving Natural Convection Heat Transfer Problems inside Cavities and Enclosures
Publisher: Hindawi Limited
Date: 2014
DOI: 10.1155/2014/762184
Abstract: Different numerical methods have been implemented to simulate internal natural convection heat transfer and also to identify the most accurate and efficient one. A laterally heated square enclosure, filled with air, was studied. A FORTRAN code based on the lattice Boltzmann method (LBM) was developed for this purpose. The finite difference method was applied to discretize the LBM equations. Furthermore, for comparison purpose, the commercially available CFD package FLUENT, which uses finite volume Method (FVM), was also used to simulate the same problem. Different discretization schemes, being the first order upwind, second order upwind, power law, and QUICK, were used with the finite volume solver where the SIMPLE and SIMPLEC algorithms linked the velocity-pressure terms. The results were also compared with existing experimental and numerical data. It was observed that the finite volume method requires less CPU usage time and yields more accurate results compared to the LBM. It has been noted that the 1st order upwind/SIMPLEC combination converges comparatively quickly with a very high accuracy especially at the boundaries. Interestingly, all variants of FVM discretization ressure-velocity linking methods lead to almost the same number of iterations to converge but higher-order schemes ask for longer iterations.
Numerical simulation of mixture homogenization through jet impingement on cylindrical obstacles
Publisher: IOP Publishing
Date: 19-07-2018
Viscous dissipation effects on thermally developing forced convection in a porous medium: Circular duct with isothermal wall
Publisher: Elsevier BV
Date: 08-2004
Laminar dissipative flow in a porous channel bounded by isothermal parallel plates
Publisher: Springer Science and Business Media LLC
Date: 05-2005
DOI: 10.1007/BF02466332
Metal Foam Heat Exchangers for Heat Transfer Augmentation from a Cylinder in Cross-Flow
Publisher: Springer Science and Business Media LLC
Date: 13-10-2010
Investigation of Micro- and Nanosized Particle Erosion in a 90° Pipe Bend Using a Two-Phase Discrete Phase Model
Publisher: Hindawi Limited
Date: 2014
DOI: 10.1155/2014/740578
Abstract: This paper addresses erosion prediction in 3-D, 90° elbow for two-phase (solid and liquid) turbulent flow with low volume fraction of copper. For a range of particle sizes from 10 nm to 100 microns and particle volume fractions from 0.00 to 0.04, the simulations were performed for the velocity range of 5–20 m/s. The 3-D governing differential equations were discretized using finite volume method. The influences of size and concentration of micro- and nanoparticles, shear forces, and turbulence on erosion behavior of fluid flow were studied. The model predictions are compared with the earlier studies and a good agreement is found. The results indicate that the erosion rate is directly dependent on particles’ size and volume fraction as well as flow velocity. It has been observed that the maximum pressure has direct relationship with the particle volume fraction and velocity but has a reverse relationship with the particle diameter. It also has been noted that there is a threshold velocity as well as a threshold particle size, beyond which significant erosion effects kick in. The average friction factor is independent of the particle size and volume fraction at a given fluid velocity but increases with the increase of inlet velocities.
Thermal dispersion effects on forced convection in a porous-saturated pipe
Publisher: Elsevier BV
Date: 06-2017
Thermo-Economic Assessment on Insulation Conditions of the Buried Heating Pipeline for District Heating
Publisher: Informa UK Limited
Date: 16-09-2022
Comparison between continuum and porous continuum models in studying natural convection in porous cavity with random distribution of solid obstacles
Publisher: Emerald
Date: 07-04-2015
Abstract: – The purpose of this paper is to improve the volume-averaged models for free convection flow in porous media. – A pore scale simulation is conducted against which an independent volume-averaged solver is fine-tuned. – Micro and macro scale results can merge if proper choice of local thermal non-equilibrium and thermal dispersion models are selected. This depends on the range of Ra values investigated. – This is the first time a work like this is published in the literature.
Techno-economic Analysis of Supercritical Carbon Dioxide Power Blocks
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4984409
Entropy generation for forced convection in a porous saturated circular tube with uniform wall temperature
Publisher: Elsevier BV
Date: 04-2007
Fully developed temperature distribution in a porous saturated duct of elliptical cross section with viscous dissipation effects and entropy generation analysis
Publisher: Begell House
Date: 2005
A comparison between the separated flow structures near the wake of a bare and a foam-covered circular cylinder
Publisher: ASME International
Date: 10-09-2014
DOI: 10.1115/1.4027686
Abstract: The flow structures behind bare and aluminum foam-covered single circular cylinders were investigated using particle image velocimetry (PIV). The experiments are conducted for a range of Reynolds numbers from 2000 to 8000, based on the outer cylinders diameter and the air velocity upstream of the cylinder. The analysis of the PIV data shows the important effects of the foam cover and the inlet velocity on the separated structures. The results show a considerable increase in the wake size behind a foam-covered cylinder compared to that of a bare cylinder. Furthermore, the turbulence intensity is found to be around 10% higher in the case of the foam-covered cylinder where the wake size is approximately doubled for the former case compared to the latter. The turbulence kinetic energy, however, is found to be less Reynolds dependent in the case of the foam-covered cylinder. In addition, small scale structures contribute to the formation of the flow structures in the foam-covered cylinder making them a more efficient turbulent generator for the next rows when used in a heat exchanger tube bundle. On the other hand, a higher energy level in such separated structures will translate into increased pressure drop compared to bare cylinders. Finally, the results of this study can be used as an accurate set of boundary conditions for modeling the flow field past such cylinders.
Effects of temperature-dependent viscosity variation on entropy generation, heat and fluid flow through a porous-saturated duct of rectangular cross-section
Publisher: Springer Science and Business Media LLC
Date: 2007
Coupling supercritical carbon dioxide Brayton cycle with spray-assisted dry cooling technology for concentrated solar power
Publisher: Elsevier BV
Date: 10-2019
Effects of temperature-dependent viscosity on thermally developing forced convection through a Porous medium
Publisher: Begell House
Date: 2005
Numerical modelling of the self-heating process of a wet porous medium
Publisher: Elsevier BV
Date: 12-2011
Supercritical CO2 Radial Turbine Design Performance as a Function of Turbine Size Parameters
Publisher: American Society of Mechanical Engineers
Date: 13-06-2016
DOI: 10.1115/GT2016-58137
Abstract: Supercritical CO2 (sCO2) radial inflow turbine are an enabling technology for small scale concentrated solar thermal power. They are a research direction of the Australian Solar Thermal Research Initiative (ASTRI). This study uses the 1D meanline design code TOPGEN, to explore the radial turbine design space under consideration of sCO2 real gas properties. TOPGEN maps a parametric design space defined by flow and head coefficient. The preliminary design code is used explore the feasibility, geometry and performance of sCO2 turbines in the 100kW to 200kW range in order to assess feasible design spaces and to investigate turbine scaling. Turbines are scaled with respect to power, while maintaining specific speed constant and with respect to speed. This analysis shows that both scaling approaches change the feasible design space and that both geometric constraints such as blade height or operational constraints such as blade natural frequency can significantly limit the design space. Detailed analysis of four shortlisted designs shows that turbine efficiencies close to 85% can be attained for 100kW and 200kW output powers, even when operating at reduced rotor speeds. This work provides new insight towards the design of small scale radial turbines for operation with sCO2 and highlights scaling issues that may arise when testing sub-scale turbine prototypes.
Multi-objective aerodynamic optimisation of a real gas radial-inflow turbine
Publisher: American Society of Mechanical Engineers
Date: 13-06-2016
DOI: 10.1115/GT2016-58132
Abstract: The above referenced paper has been removed from publication. June 29, 2017. Copyright © 2017 by ASME
Efficiency of a Combined Desalination and Power System Utilizing a Two-Phase Flow Multistream Heat Exchanger
Publisher: Informa UK Limited
Date: 13-09-2017
Thermally developing Brinkman-Brinkman forced convection in rectangular ducts with isothermal walls
Publisher: Elsevier BV
Date: 08-2007
Selected Papers From the 17th IAHR (International Association for Hydro-Environment Engineering and Research) International Conference on Cooling Tower and Heat Exchanger
Publisher: Informa UK Limited
Date: 13-09-2016
Design and assessments on a hybrid pin fin-metal foam structure towards enhancing melting heat transfer: An experimental study
Publisher: Elsevier BV
Date: 12-2022
Computational investigations of heat transfer to supercritical CO2 in a large horizontal tube
Publisher: Elsevier BV
Date: 02-2018
Lattice Boltzmann Simulation of Conjugate Heat Transfer from Multiple Heated Obstacles Mounted in a Walled Parallel Plate Channel
Publisher: Informa UK Limited
Date: 15-10-2012
Characteristics of the wake behind a heated cylinder in relatively high Reynolds number
Publisher: Elsevier BV
Date: 07-2015
Buoyancy Effects on Cooling a Heat Generating Porous Medium: Coal Stockpile
Publisher: Springer Science and Business Media LLC
Date: 12-02-2011
On the electrical and thermal contact resistance of metal foam
Publisher: Elsevier BV
Date: 05-2014
Discharge performance of a high temperature phase change material with low-cost wire mesh
Publisher: Elsevier BV
Date: 03-2023
Thermohydraulics of a metal foam-filled annulus
Publisher: Elsevier BV
Date: 02-2018
Heatline Visualization of Natural Convection in a Porous Cavity Occupied by a Fluid With Temperature-Dependent Viscosity
Publisher: ASME International
Date: 2008
DOI: 10.1115/1.2780179
Abstract: Temperature-dependent viscosity effect in buoyancy driven flow of a gas or a liquid in an enclosure filled with a porous medium is studied numerically based on the general model of momentum transfer in a porous medium. The exponential form of viscosity-temperature relation is applied to examine three cases of viscosity-temperature relation: constant, decreasing, and increasing. Application of arithmetic and harmonic mean values of the viscosity is also investigated for their ability to represent the Nusselt number versus the effective Rayleigh number. Heat lines are illustrated for a more comprehensive investigation of the problem.
Effects of thermal boundary condition, fin size, spacing, tip clearance, and material on pressure drop, heat transfer, and entropy generation optimization for forced convection from a variable-height shrouded fin array
Publisher: Begell House
Date: 2009
A comprehensive review on numerical approaches to simulate heat transfer of turbulent supercritical CO2 flows
Publisher: Informa UK Limited
Date: 04-02-2020
Experimental study of fluid flow behaviour and pressure drop in channels partially filled with metal foams
Publisher: Elsevier BV
Date: 12-2018
Thermodynamic study on a combined heat and compressed air energy storage system with a dual-pressure organic Rankine cycle
Publisher: Elsevier BV
Date: 10-2020
Numerical study of turbulent convection in inclined pipes with significant buoyancy influence
Publisher: Elsevier BV
Date: 06-2013
Metal foam heat exchangers for heat transfer augmentation from a tube bank
Publisher: Elsevier BV
Date: 04-2012
Addressing the adverse cold air inflow effects for a short natural draft dry cooling tower through swirl generation
Publisher: Elsevier BV
Date: 12-2019
Effects of viscous dissipation on forced convection in a porous saturated duct with a uniform wall temperature
Publisher: Begell House
Date: 2004
Numerical study of melting performance enhancement for PCM in an annular enclosure with internal-external fins and metal foams
Publisher: Elsevier BV
Date: 04-2020
A new criterion to design reactive coal stockpiles
Publisher: Elsevier BV
Date: 08-2009
Investigations on the influence of nozzle arrangement on the pre-cooling effect for the natural draft dry cooling tower
Publisher: Elsevier BV
Date: 02-2018
A conceptual study on air jet-induced swirling plume for performance improvement of natural draft cooling towers
Publisher: Elsevier BV
Date: 05-2018
A designed wall roughness approach to improve turbulent heat transfer to supercritical CO2 flowing in horizontal tubes
Publisher: Elsevier BV
Date: 11-2022
Experimental study on the air-side flow resistance of different water collecting devices for wet cooling tower applications
Publisher: Elsevier BV
Date: 07-2019
Numerical and experimental study on a single cone saline water spray in a wind tunnel
Publisher: Elsevier BV
Date: 10-2017
A facile, green fabrication of aqueous nanofluids containing hydrophilic functionalized carbon nanotubes toward improving heat transfer in a closed horizontal flow passage
Publisher: Elsevier BV
Date: 05-2022
A review of patents in tyre cooling
Publisher: Bentham Science Publishers Ltd.
Date: 06-2008
Metal foam heat exchangers for thermal management of fuel cell systems - An experimental study
Publisher: Elsevier BV
Date: 11-2013
Numerical simulation of natural convection and mixed convection of the nanofluid in a square cavity using Buongiorno model
Publisher: Elsevier BV
Date: 12-2014
Evaluating transport in irregular pore networks
Publisher: American Physical Society (APS)
Date: 10-07-2012
Second law analysis of laminar flow in a channel filled with saturated porous media: A numerical solution
Publisher: MDPI AG
Date: 09-12-2005
DOI: 10.3390/E7040300
Optimisation of a high pressure ratio radial-inflow turbine: Coupled CFD-FE analysis
Publisher: American Society of Mechanical Engineers
Date: 15-06-2015
DOI: 10.1115/GT2015-42208
Abstract: The optimisation of a 5.7 air pressure ratio single stage radial-inflow turbine applied in the Sundstrand Power Systems T-100 Multipurpose Small Power Unit (MPSPU) is performed using coupled CFD-FE method. The commercial software ANSYS-Vista RTD along with a built-in module, BladeGen, is used to conduct a meanline design and, consequently, create the 3D geometry of the flow passage. Carefully examining the proposed design against the geometrical and experimental data, ANSYS-TurboGrid is applied to generate computational mesh. CFD simulations are then performed with ANSYS-CFX in which three-dimensional Reynolds-Averaged Navier-Stokes equations are solved subject to appropriate boundary conditions. Conducting the CFD simulations, the pressure and temperature distributions are imported to the ANSYS-FE module. The von Mises stress σv distribution is then calculated taking into account the centrifugal force acting on the turbine wheel. To obtain the optimised geometry, 25 major design points are regenerated where the meridional parameters, tip clearance, and blade thickness distribution are systematically changed. Furthermore, constraints are defined as high aerothermodynamic performance and acceptable vibration with a stress distribution less than yield limit of the turbine material. Results of coupled CFD-FE method show the power, efficiency, stress and deformation. Finally, performance of the optimised radial-inflow turbine indicates enhanced aero-thermodynamics (ηTS and) and structural performance (σv) compared to the MPSPU turbine design.
Numerical investigation of the natural convection film boiling around elliptical tubes
Publisher: Informa UK Limited
Date: 20-09-2016
Theoretical analysis of free convection in a partially foam-filled enclosure
Publisher: Springer Science and Business Media LLC
Date: 31-08-2018
Slip-flow in microchannels of non-circular cross sections
Publisher: ASME International
Date: 09-2011
DOI: 10.1115/1.4004591
Abstract: Closed form solutions are presented for fully developed pressure driven slip-flow in straight microchannels of uniform noncircular cross-sections. To achieve this goal, starting from the general solution of the Poisson’s equation in the cylindrical coordinate, a least-squares-matching of boundary values is employed for applying the slip boundary condition at the wall. Then the application of boundary conditions for three different types of cross sections is examined. While the model is general enough to be extended to almost any arbitrary cross section, microchannels of polygonal (with circular as a limiting case), rectangular, and rhombic cross sections are analyzed in this study. The results are then successfully compared to the existing data in the literature.
Investigation on the influence of injection direction on the spray cooling performance in natural draft dry cooling tower
Publisher: Elsevier BV
Date: 07-2017
Porous Medium Modeling of Air-Cooled Condensers
Publisher: Springer Science and Business Media LLC
Date: 14-11-2009
Flow visualization study of partially filled channel with aluminium foam block
Publisher: Elsevier BV
Date: 12-2018
CFD simulations of flow and heat transfer through the porous interface of a metal foam heat exchanger
Publisher: American Society of Mechanical Engineers
Date: 28-07-2014
Abstract: This paper offers numerical modelling of a waste heat recovery system. A thin layer of metal foam is attached to a cold plate to absorb heat from hot gases leaving the system. The heat transferred from the exhaust gas is then transferred to a cold liquid flowing in a secondary loop. Two different foam PPI (Pores Per Inch) values are examined over a range of fluid velocities. Numerical results are then compared to both experimental data and theoretical results available in the literature. Challenges in getting the simulation results to match those of the experiments are addressed and discussed in detail. In particular, interface boundary conditions specified between a porous layer and a fluid layer are investigated. While physically one expects much lower fluid velocity in the pores compared to that of free flow, capturing this sharp gradient at the interface can add to the difficulties of numerical simulation. The existing models in the literature are modified by considering the pressure gradient inside and outside the foam. Comparisons against the numerical modelling are presented. Finally, based on experimentally-validated numerical results, thermo-hydraulic performance of foam heat exchangers as waste heat recovery units is discussed with the main goal of reducing the excess pressure drop and maximising the amount of heat that can be recovered from the hot gas stream.
Experimental study of the application of two trickle media for inlet air pre-cooling of natural draft dry cooling towers
Publisher: Elsevier BV
Date: 2015
Using a porous segment to increase thermal efficiency by converting gas enthalpy to thermal radiation in high-temperature industrial furnaces: Exact solution
Publisher: Begell House
Date: 2004
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Publisher: ASME
Date: 07-07-2014
Buoyancy induced heat transfer deterioration in vertical concentric and eccentric annuli
Publisher: Elsevier BV
Date: 02-2015
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Publisher: Elsevier BV
Date: 2020
A biomimetic red blood cell inspired encapsulation design for advanced hydrate-based carbon capture
Publisher: Elsevier BV
Date: 05-2023
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Publisher: Elsevier BV
Date: 02-2015
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Publisher: Springer Science and Business Media LLC
Date: 02-2008
Genetic algorithm optimization for finned channel performance
Publisher: Springer Science and Business Media LLC
Date: 12-2007
Entropy generation for natural convection by heated partitions in a cavity
Publisher: Elsevier BV
Date: 04-2008
Design and Testing of a Low-speed Rotating Wind Tunnel
Publisher: The University of Queensland
Date: 11-12-2020
DOI: 10.14264/E001EC9
Theoretical modelling of momentum transfer function of bi-disperse porous media
Publisher: Elsevier BV
Date: 2015
Comparison of direct and indirect natural draft dry cooling tower cooling of the sCO2 Brayton cycle for concentrated solar power plants
Publisher: Elsevier BV
Date: 02-2018
Heat transfer in the thermal entrance region for flow through rectangular porous passages
Publisher: Elsevier BV
Date: 08-2006
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Date: 09-2014
Heat transfer and entropy generation optimization of forced convection in porous-saturated ducts of rectangular cross-section
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Date: 06-2007
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Publisher: Elsevier BV
Date: 07-2017
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University Of Massachusetts Amherst
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Related Funding Activities
Discovery Early Career Researcher Award - Grant ID: DE150100397
Start Date: 06-2015
End Date: 06-2018
Amount: $340,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE220100022
Start Date: 04-2022
End Date: 12-2023
Amount: $475,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP110103270
Start Date: 2011
End Date: 12-2013
Amount: $202,000.00
Funder: Australian Research Council
View Funded Activity