ORCID Profile
0000-0002-7669-2221
Current Organisation
University of Adelaide
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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)
Interdisciplinary Engineering | Turbulent Flows | Energy Generation, Conversion and Storage Engineering | Renewable Power and Energy Systems Engineering (excl. Solar Cells) | Interdisciplinary Engineering not elsewhere classified | Aerospace Engineering | Non-automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels) | Electrical and Electronic Engineering | Aerodynamics (excl. Hypersonic Aerodynamics) | Petroleum and reservoir engineering | Resources engineering and extractive metallurgy | Geomechanics and resources geotechnical engineering | Multiphysics flows (incl. multiphase and reacting flows) | Fluidisation and Fluid Mechanics | Heat and Mass Transfer Operations | Ocean Engineering |
ANZSRC Socio-Economic Objective (SEO)
Solar-Thermal Energy | First Stage Treatment of Ores and Minerals not elsewhere classified | Energy Storage, Distribution and Supply not elsewhere classified | Transformation of Coal into Liquid Fuels | Wave Energy | Biofuel (Biomass) Energy | Energy Storage (excl. Hydrogen) | Energy Conservation and Efficiency in Transport | Expanding Knowledge in the Physical Sciences |
Related Links
Publications
A size-dependent nonlinear third-order shear-deformable dynamic model for a microplate on an elastic medium
Publisher: Springer Science and Business Media LLC
Date: 11-08-2016
High Quality Syngas Production with Supercritical Biomass Gasification Integrated with a Water–Gas Shift Reactor
Publisher: MDPI AG
Date: 05-07-2019
DOI: 10.3390/EN12132591
Abstract: A thermodynamic assessment is conducted for a new configuration of a supercritical water gasification plant with a water–gas shift reactor. The proposed configuration offers the potential for the production of syngas at different H2:CO ratios for various applications such as the Fischer–Tropsch process or fuel cells, and it is a path for addressing the common challenges associated with conventional gasification plants such as nitrogen dilution and ash separation. The proposed concept consists of two reactors, R1 and R2, where the carbon containing fuel is gasified (in reactor R1) and in reactor R2, the quality of the syngas (H2:CO ratio) is substantially improved. Reactor R1 is a supercritical water gasifier and reactor R2 is a water–gas shift reactor. The proposed concept was modelled using the Gibbs minimization method with HSC chemistry software. Our results show that the supercritical water to fuel ratio (SCW/C) is a key parameter for determining the quality of syngas (molar ratio of H2:CO) and the carbon conversion reaches 100%, when the SWC/C ratio ranges between two and 2.5 at 500–1000 °C.
An investigation into the effect of aspect ratio on the heat loss from a solar cavity receiver
Publisher: Elsevier BV
Date: 06-2017
Reply
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 09-2013
Thermogravimetric analysis of Cu, Mn, Co, and Pb oxides for thermochemical energy storage
Publisher: Elsevier BV
Date: 06-2019
A hybrid solar chemical looping combustion system with a high solar share
Publisher: Elsevier BV
Date: 08-2014
Experimental investigation of peak wind loads on tandem operating heliostats within an atmospheric boundary layer
Publisher: Elsevier BV
Date: 05-2019
Formation of vortices on a tubercled wing, and their effects on drag
Publisher: Elsevier BV
Date: 09-2016
Energy analysis within a vortex tube
Publisher: Elsevier BV
Date: 2014
Experimental thermal energy assessment of a liquid metal eutectic in a microchannel heat exchanger equipped with a (10 Hz/50 Hz) resonator
Publisher: Elsevier BV
Date: 02-2019
Attenuation of turbulence by the passive control of sweep events in a turbulent boundary layer using micro-cavities
Publisher: AIP Publishing
Date: 11-2017
DOI: 10.1063/1.4995466
Abstract: Cavity arrays have been previously identified to disrupt the sweep events and consequently the bursting cycle in the boundary layer by capturing the structures responsible for the Reynolds stresses. In the present study, the sensitivity of a flushed-surface cavity array in reducing the turbulent energy production has been investigated. Two plates of varying thicknesses and four different backing cavity volumes were considered, at three different Reynolds numbers. The volume of the backing cavity was shown to be the most important characteristic in determining the attenuation of streamwise velocity fluctuations within the logarithmic region of the turbulent boundary layer. However, the results also demonstrated that the orifice length of the cavity array had negligible effect in modifying the reduction of the turbulent energy by the cavity array in this investigation. The results show that the maximum reduction in turbulence generation achieved for this study occurs when the backing volume is 3.1 × 106 times greater than the viscous length scale at Reθ = 3771. The reduction in turbulence intensity, sweep intensity, and energy spectrum were shown to be 5.6%, 6.3%, and 13.4%, respectively. By decreasing the cavity volume to zero, no change in the turbulent boundary layer turbulence statistics was found. The results suggest a larger reduction in turbulence intensity, sweep intensity, and energy spectrum that can be achieved with a larger backing volume.
Measurement of unsteady wind loads in a wind tunnel: Scaling of turbulence spectra
Publisher: Elsevier BV
Date: 10-2019
A hybrid solar and chemical looping combustion system for solar thermal energy storage
Publisher: Elsevier BV
Date: 03-2013
The energetic performance of a novel hybrid solar thermal & chemical looping combustion plant
Publisher: Elsevier BV
Date: 11-2014
Thin airfoil load control during post-stall and large pitch angles using leading-edge trips
Publisher: Elsevier BV
Date: 08-2018
Considerations on the control design for a three-tether wave energy converter
Publisher: Elsevier BV
Date: 07-2019
Towards testing of a second-generation bladed receiver
Publisher: AIP Publishing
Date: 2019
DOI: 10.1063/1.5117556
Investigation of peak wind loads on tandem heliostats in stow position
Publisher: Elsevier BV
Date: 06-2018
Visualization of the flow structure in a vortex tube
Publisher: Elsevier BV
Date: 11-2011
The response of a flat plate boundary layer to an orthogonally arranged dielectric barrier discharge actuator
Publisher: IOP Publishing
Date: 16-12-2012
Turbulence length scales in a low-roughness near-neutral atmospheric surface layer
Publisher: Informa UK Limited
Date: 02-09-2019
Effect of heliostat design wind speed on the levelised cost of electricity from concentrating solar thermal power tower plants
Publisher: Elsevier BV
Date: 05-2015
Investigation into the Effect of Electrode Angle on Force Production of a Dielectric Barrier Discharge Plasma Actuator
Publisher: American Institute of Aeronautics and Astronautics
Date: 09-01-2012
DOI: 10.2514/6.2012-821
Analytical assessment of a novel rotating fluidized bed solar reactor for steam gasification of char particles
Publisher: Elsevier BV
Date: 12-2016
Understanding of the flow behaviour on a Helmholtz resonator excited by grazing flow
Publisher: Informa UK Limited
Date: 28-05-2014
Horizontal axis wind turbine dynamic stall predictions based on wind speed and direction variability
Publisher: SAGE Publications
Date: 24-04-2013
Abstract: The onset of dynamic stall in horizontal axis wind turbines (HAWTs) is related to the rapid increase in the angle of attack caused by sudden changes in wind speed and direction. In order to relate the changes in wind speed and direction with the variations in the blade-section angle of attack, an analytical model is proposed to determine the regions of the blade affected by dynamic stall. The so-called threshold radius has been identified and defined as the percentage of the blade length from the horizontal axis wind turbines hub beyond which the probability of dynamic stall occurrence falls to zero. High quality wind data were acquired to determine the average wind conditions that serve as the model inputs. It is shown that the rate of change of wind speed, due to gusts or the average turbulence, can cause large regions of dynamic stall on the wind turbine blade. Other parameters, such as the yaw misalignment and the rate of change of yaw angle are shown to be the cause of asymmetrical distribution of threshold radius with azimuth and also serve to increase the affected regions. Finally it is shown that the type of airfoil used in the turbine blade also has a significant effect on the threshold radius due to the different limiting reduced frequencies.
Thermal and hydraulic analysis of a rectangular microchannel with gallium-copper oxide nano-suspension
Publisher: Elsevier BV
Date: 08-2018
An investigation into the sensory application of DBD plasma actuators for pressure measurement
Publisher: Elsevier BV
Date: 11-2011
Pool boiling under the magnetic environment: experimental study on the role of magnetism in particulate fouling and bubbling of iron oxide/ethylene glycol nano-suspension
Publisher: Springer Science and Business Media LLC
Date: 31-07-2019
Performance comparison of the floating and fully submerged quasi-point absorber wave energy converters
Publisher: Elsevier BV
Date: 08-2017
Experimental and numerical investigation of the flow characteristics within a Solar Expanding-Vortex Particle Receiver-Reactor
Publisher: Elsevier BV
Date: 2017
The impact of geometrical parameters on acoustically driven drug delivery to maxillary sinuses
Publisher: Springer Science and Business Media LLC
Date: 10-2020
DOI: 10.1007/S10237-019-01230-5
Abstract: Acoustically driven nebulized drug delivery (acoustic aerosol delivery) is the most efficient noninvasive technique for drug delivery to maxillary sinuses (MS). This method is based on the oscillation of the air plug inside the ostium to transport drug particles from the nasal cavity (NC) to the MS. The larger the wavelength of the air plug oscillation in the ostium, the greater the penetration of drug particles to the MS. However, using this technique, the maximum drug delivery efficiency achieved to date is 5%, which means 95% of the aerosolized drugs do not enter the MS and are wasted. Since the largest litude of the air plug oscillation occurs at its resonance frequency, to achieve an improved MS drug delivery efficiency, it is important to determine the resonance frequency of the nose-sinus combination accurately. This paper aims to investigate the impact of geometrical parameters on the resonance frequency of the nose-sinus model. Both experimental and computational acoustic models, along with the theoretical analysis, were conducted to determine the resonance frequency of an idealized nose-sinus model. The computational modeling was carried out using computational fluid dynamics (CFD) and finite element analysis (FEA), whereas in the analytical solution, the mathematical relationships developed for a conventional Helmholtz resonator were employed. A series of experiments were also conducted to measure the resonance frequency of a realistic NC-MS combination. The results demonstrated a good agreement between the experimental and CFD modeling, while the FEA and theoretical analysis showed a significant deviation from the experimental data. Also, it was shown that the resonance frequency of the idealized nose-sinus model increases by up to twofold with increasing the ostium diameter from 3 to 9 mm however, it has an inverse relationship with the ostium length and sinus volume. It was also reported that the resonance frequency of the nose-sinus model is independent of the NC width and MS shape.
Effect of artery curvature on the coronary fractional flow reserve
Publisher: AIP Publishing
Date: 03-2021
DOI: 10.1063/5.0042601
Abstract: Understanding the effect of the artery curvature on the pressure drop inside the arteries is of great importance due to the existence of several curved portions inside the coronary arterial system. In this paper, an experimental model is developed to account for the effect of the curvature of the coronary arteries on the pressure drop and Fractional Flow Reserve (FFR). FFR is an index for the evaluation of the functional significance of coronary stenosis and is defined as the ratio of the coronary pressure downstream of the stenosis to its upstream value. To measure the pressure drop and FFR across curved artery models, three-dimensional-printed curved artery models are fabricated and installed in the test section of the experimental rig. For ratios of curvature radius over the artery diameter ranging from 2 to 7, there are a minimum value for the pressure drop and, hence, a corresponding maximum value for FFR at a ratio of approximately 3. For the curved arteries with larger curvature radii, the pressure drop increases, and consequently, FFR decreases with an increase in the radius. The results showed that an accurate evaluation of the pressure drop and FFR inside a curved coronary artery can only be achieved by accounting for the effect of curvature parameters including the curvature angle and radius, such that neglecting the effect of the artery curvature results in an underestimation of the pressure drop by about 25%–35%. The developed equation is able to determine the pressure drop inside a curved coronary artery model noninvasively.
Flow-induced vibration of an elastically mounted airfoil under the influence of the wake of a circular cylinder
Publisher: Elsevier BV
Date: 06-2016
Mechanism of sweep event attenuation using micro-cavities in a turbulent boundary layer
Publisher: AIP Publishing
Date: 05-2018
DOI: 10.1063/1.5026130
Abstract: Cavity arrays have been identified as a potential passive device to disrupt and capture sweep events, which are responsible for the excess Reynolds stresses in the boundary layer. In the present study, the mechanism of the attenuation of captured sweep events has been analyzed, as well as the non-linear relationship between the volume of the backing cavity and the reduction in sweep intensity. The influence of cavity array on the turbulent boundary layer has been analyzed, with a total of six different backing cavity arrangements with varying volumes. Three of the backing cavities have been used to determine the non-linear relationship between the effectiveness of the cavity array in reducing sweep intensity and the volume of the backing cavity. The other three have been used to determine the mechanism by which the arrays manipulate the captured sweep events. The pre-multiplied energy spectra of multiple velocity histories were significantly reduced, by up to 12.5%, in the low and mid-range wavelength values (λx+& ), which is associated with the coherent structures. The results show that the maximum reduction in sweep intensity of approximately 7% may be obtained when Reθ = 3771. It has been demonstrated that the non-linear relationship between sweep event intensity reduction and cavity volume has reached an upper limit in this investigation. Results from this study have revealed that the cavity array weakens the sweep intensity of the captured sweep events by d ing the energy of the events through the friction losses in the cavity array and also in the large volume of the backing cavity.
Modal analysis of a submerged spherical point absorber with asymmetric mass distribution
Publisher: Elsevier BV
Date: 2019
Tubercles and Their Applications
Publisher: American Society of Civil Engineers (ASCE)
Date: 2016
Heat transfer and fluid flow of MgO/ethylene glycol in a corrugated heat exchanger
Publisher: Springer Science and Business Media LLC
Date: 08-2018
Nonlinear hydrodynamics analysis of a submerged spherical point absorber with asymmetric mass distribution
Publisher: Elsevier BV
Date: 03-2020
Methods to control dynamic stall for wind turbine applications
Publisher: Elsevier BV
Date: 02-2016
An investigation into the effect of electric field on the performance of Dielectric Barrier Discharge plasma actuators
Publisher: Elsevier BV
Date: 11-2011
Development of the ASTRI heliostat
Publisher: Author(s)
Date: 2016
DOI: 10.1063/1.4949029
Dynamic- and post-stall characteristics of pitching airfoils at extreme conditions
Publisher: SAGE Publications
Date: 06-2017
The Application of Different Tripping Techniques to Determine the Characteristics of the Turbulent Boundary Layer Over a Flat Plate
Publisher: ASME International
Date: 20-09-2017
DOI: 10.1115/1.4037675
Abstract: In the present study, the optimal two-dimensional (2D) tripping technique for inducing a naturally fully developed turbulent boundary layer in wind tunnels has been investigated. Various tripping techniques were tested, including wires of different diameters and changes in roughness. Experimental measurements were taken on a flat plate in a wind tunnel at a number of locations along the flat plate and at a variety of flow speeds using hot-wire anemometry to measure the boundary layer resulting from each tripping method. The results have demonstrated that to produce a natural turbulent boundary layer using a 2D protuberance, the height of the trip must be less than the undisturbed boundary layer thickness. Using such a trip was shown to reduce the development length of the turbulent boundary layer by approximately 50%. This was shown to hold true for all Reynolds numbers investigated (Rex=1.2×105−1.5×106). The present study provides an insight into the effect of the investigated trip techniques on the induced transition of a laminar boundary layer into turbulence.
A discussion of wind turbine interaction and stall contributions to wind farm noise
Publisher: Elsevier BV
Date: 04-2014
Energy Concentration by Bluff Bodies-A Particle Image Velocimetry Investigation
Publisher: ASME International
Date: 24-12-2019
DOI: 10.1115/1.4041886
Abstract: Particle image velocimetry (PIV) of four cylinders with different cross sections were performed in a recirculating water channel at Reynolds numbers of 5000 and 10,000. The cylinders were split into two distinct categories semicircular and convex-edged triangular (c-triangular) prisms which have a smooth erging fore-face and a flat, backward facing step aft-face, and a trapezoid which has a flat fore face and a backward-facing step aft-face. The resulting streamwise and transverse velocity vectors (u and v, respectively) were analyzed to provide a qualitative comparison of the bluff body wakes to the circular cylinder, which is the standard upstream stationary body in wake-induced vibration (WIV) energy technology. The Reynolds stresses, turbulent kinetic energy (TKE), mean spanwise vorticity, and the energy in the fluctuating component of the wake were compared. The main findings are: (i) a convex fore-face and a backward-facing step aft face are more effective at converting the flow energy to temporal wake energy (+20%) compared to a circular cylinder, (ii) a trapezoid type shape is less effective at converting flow energy to temporal wake energy (−40%) compared to a circular cylinder, (iii) increasing Reynolds number reduces the efficiency of conversion of upstream flow energy to downstream transverse temporal energy. Utilizing stationary upstream bodies such as the semicircle and the c-triangle can result in concentrating more energy in the fluctuating components for the downstream transversely vibrating bluff body in a WIV system, and hence can realize in more efficient WIV technology.
Dynamic Stall Flow Structure and Forces on Symmetrical Airfoils at High Angles of Attack and Rotation Rates
Publisher: ASME International
Date: 13-11-2018
DOI: 10.1115/1.4041523
Abstract: This article describes a direct comparison between two symmetrical airfoils undergoing dynamic stall at high, unsteady reduced frequencies under otherwise identical conditions. Particle image velocimetry (PIV) was performed to distinguish the differences in flow structure between a NACA 0021 and a NACA 0012 airfoil undergoing dynamic stall. In addition, surface pressure measurements were performed to evaluate aerodynamic load and investigate the effect of laminar separation bubbles and vortex structures on the pressure fields surrounding the airfoils. Airfoil geometry is shown to have a significant effect on flow structure development and boundary layer separation, with separation occurring earlier for thinner airfoil sections undergoing constant pitch-rate motion. Inertial forces were identified to have a considerable impact on the overall force generation with increasing rotation rate. Force oscillation was observed to correlate with multiple vortex structures shedding at the trailing-edge during high rotation rates. The presence of laminar separation bubbles on the upper and lower surfaces was shown to dramatically influence the steady-state lift of both airfoils. Poststall characteristics are shown to be independent of airfoil geometry such that periodic vortex shedding was observed for all cases. However, the onset of deep stall is delayed with increased nondimensional pitch rate due to the delay in initial dynamic-stall vortex.
The influence of atmospheric boundary layer turbulence on the design wind loads and cost of heliostats
Publisher: Elsevier BV
Date: 09-2020
Mixed convection around a tilted cuboid with an isothermal sidewall at moderate Reynolds numbers
Publisher: Elsevier BV
Date: 04-2018
Experimental investigation of the flow characteristics within a vortex tube with different configurations
Publisher: Elsevier BV
Date: 02-2019
Thermal performance analysis of a microchannel heat sink cooling with copper oxide-indium (CuO/In) nano-suspensions at high-temperatures
Publisher: Elsevier BV
Date: 06-2018
Effects of wake interaction on downstream wind turbines
Publisher: SAGE Publications
Date: 10-2014
DOI: 10.1260/0309-524X.38.5.535
Abstract: The present article revisits the wake studies behind the NREL (National Renewable Energy Laboratory) Phase VI wind turbine inside a virtual wind tunnel that were recently performed at the University of Adelaide using Large Eddy Simulation (LES). A notable observation has been made in the current article, through comparisons of instantaneous contours of vorticity, velocity and turbulence intensity, that the regions of velocity deficits and high turbulence intensities in the wake are restricted to the regions of high vorticity. Therefore, for a downstream wind turbine, the smaller power production, the increased unsteady loads and the noise produced can directly be associated with the turbine blades passing through the streamwise vortices generated by the upstream wind turbine. In addition, a comparative analysis has been performed between the LES and semi-empirical models, used in the industry, to better understand the development of the wake inside the wind tunnel model. Finally, in order to illustrate the effects of wake on downstream wind turbines, a dynamic stall prediction model was used to determine the regions of the turbine blade affected by dynamic stall as a function of spacing between the turbines.
Heat transfer and pressure drop characteristics of MgO nanofluid in a double pipe heat exchanger
Publisher: Springer Science and Business Media LLC
Date: 04-01-2019
Potential use of liquid metal oxides for chemical looping gasification: A thermodynamic assessment
Publisher: Elsevier BV
Date: 06-2017
Numerical investigation of the isothermal flow field and particle deposition behaviour in a rotating fluidized bed solar receiver
Publisher: Elsevier BV
Date: 04-2019
Self-noise and directivity of simple airfoils during stall: an experimental comparison
Publisher: Elsevier BV
Date: 12-2017
An experimental model for pressure drop evaluation in a stenosed coronary artery
Publisher: AIP Publishing
Date: 02-2020
DOI: 10.1063/1.5139701
Abstract: Non-invasive measurement of pressure drop has great clinical significance for the treatment of coronary artery diseases. The objective of this study is to develop a relationship that can estimate pressure drop in a stenosed coronary artery model as a function of different parameters such as blood viscosity, artery length and diameter, flow rate and flow profile, and shape and degrees of stenosis. Experimental pressure measurements from a wide range of degrees of stenosis and critical simplified geometries of stenosis along with different unsteady flow profiles are employed to evaluate the pressure drop equation. To calculate the blockage term of the pressure drop, several experimental cases are investigated, and the results show that the blockage factor is strongly dependent on the shape and degree of stenosis. Furthermore, different unsteady flow profiles are applied to calculate the pulsatile pressure drop term, and it is found that the pulsatility parameter is not a function of the flow profile or the shape of the stenosis. However, it is only a function of the degree of stenosis. To test the validity of the developed equation, pressure drops through stenosed coronary artery models with the real physiological flow profile of the left and right coronary arteries were predicted and compared with the experimental measurements. The proposed equation is able to determine the pressure drop inside a stenosed coronary artery non-invasively using the measurement of the flow profile inside the artery as well as the images of the stenosed coronary artery obtained based on the non-invasive methods.
Harnessing hydro-kinetic energy from wake-induced vibration using virtual mass spring damper system
Publisher: Elsevier BV
Date: 11-2015
A method for the calculation of the design wind loads on heliostats
Publisher: AIP Publishing
Date: 2019
DOI: 10.1063/1.5117532
Thermodynamic potential of high temperature chemical looping combustion with molten iron oxide as the oxygen carrier
Publisher: Elsevier BV
Date: 04-2017
Development of ASTRI high-temperature solar receivers
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4984354
Large eddy simulation of the wind turbine wake characteristics in the numerical wind tunnel model
Publisher: Elsevier BV
Date: 2013
An insight into the dynamic stall lift characteristics
Publisher: Elsevier BV
Date: 10-2014
Atmospheric Plasma Thruster: Theory and Concept
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 02-2013
DOI: 10.2514/1.J051793
Feasibility study of the three-tether axisymmetric wave energy converter
Publisher: Elsevier BV
Date: 02-2018
The influence of wind speed, aperture ratio and tilt angle on the heat losses from a finely controlled heated cavity for a solar receiver
Publisher: Elsevier BV
Date: 12-2019
Mechanism of control of the near-wall turbulence using a micro-cavity array
Publisher: AIP Publishing
Date: 07-2021
DOI: 10.1063/5.0051375
Abstract: Coherent structures in a turbulent boundary layer have been shown to have an influence on the skin-friction drag acting on surfaces beneath the boundary layer. The use of micro-cavities on a flat surface has recently shown the potential to passively control a turbulent boundary layer by attenuating the sweep events. Previous experiments have determined the design parameters of the cavity array for the optimal boundary-layer control by reducing the sweep events. However, investigating the flow physics behind the interaction of the boundary-layer flow with the cavities is challenging. High near-wall velocity gradients and very small scales and sizes of the cavity holes limit the experiments from investigating the flow characteristics very close to the wall and inside the holes. Therefore, in the present work, direct numerical simulations have been utilized to model the boundary layer flow over a flat surface with a micro-cavity array in order to understand the flow interactions. Detection of coherent structures in the boundary layer shows a reduction in the number of events over the cavity array. Reynolds stresses have been analyzed to determine the effect of micro-cavities. The reduction in the Reynolds shear stress results in a lower skin-friction drag. The flow fluctuations through the holes in the streamwise sequence have been found to be highly correlated using cross correlation. These flow fluctuations interact with the boundary layer to suppress the coherent structures. Overall, the use of the micro-cavity array has resulted in a reduced wall shear stress and approximately 5.6% lower local skin-friction drag.
Parametric study of the effects of a Tubercle's geometry on wing performance through the use of the lifting-line theory
Publisher: American Institute of Aeronautics and Astronautics
Date: 02-01-2016
DOI: 10.2514/6.2016-0295
The influence of high intensity solar radiation on the temperature and reduction of an oxygen carrier particle in hybrid chemical looping combustion
Publisher: Elsevier BV
Date: 05-2013
A study of long separation bubble on thick airfoils and its consequent effects
Publisher: Elsevier BV
Date: 04-2015
Analysis of the turbulent boundary layer in the vicinity of a self-excited cylindrical Helmholtz resonator
Publisher: Informa UK Limited
Date: 08-04-2015
Self-noise of NACA 0012 and NACA 0021 aerofoils at the onset of stall
Publisher: SAGE Publications
Date: 04-2017
Abstract: The aerodynamic noise of a NACA 0012 and NACA 0021 aerofoil is measured and compared in order to determine whether there are differences in their noise signatures with a focus on the onset of stall. Measurements of the self-noise of each aerofoil are measured in an open-jet Anechoic Wind Tunnel at Reynolds numbers of 64,000 and 96,000, at geometric angles of attack from −5° through 40° at a resolution of 1°. Further measurements are taken at Re = 96,000 at geometric angles of attack from −5 through 16° at a resolution of 0.5°. Results show that while the noise generated far into the stall regime is quite similar for both aerofoils the change in noise level at the onset of stall is significantly different between the two aerofoils with the NACA 0021 exhibiting a much sharper increase in noise levels below a chord-based Strouhal number of St c = 1.1. This behaviour is consistent with the changes in lift of these aerofoils as well as the rate of collapse of the suction peak of a NACA 0012 aerofoil under these flow conditions.
Convective Bubbly Flow of Water in an Annular Pipe: Role of Total Dissolved Solids on Heat Transfer Characteristics and Bubble Formation
Publisher: MDPI AG
Date: 29-07-2019
DOI: 10.3390/W11081566
Abstract: Formation of bubbles in water inside an annulus pipe in a flow boiling regime was experimentally investigated. The effect of various variables, such as total dissolved solid materials (TDS) in terms of mass fraction, flow rate of water, and applied heat flux (HF) on the heat transfer coefficient (HTC) and bubble behavior of water, was experimentally investigated. A regression formula was fitted to estimate the average bubble diameter at various TDS values, with accuracy of .1% up to heat flux of 90 kW/m2. Results show that the presence of TDS materials can increase the contact angle of bubble and bubble diameter, and also promotes the HTC value of the system. However, flow rate of water suppressed bubble generation, and increased the heat transfer coefficient due to the renewal of the thermal boundary layer around the boiling surface. Likewise, it was identified that forced convective and nucleate boiling heat transfer mechanisms contribute to the flow of boiling water, and heat flux is a key parameter in determining the mechanism of heat transfer. In the present study, heat flux of 15 kW/m2 at 50 °C was the heat flux in which onset of nucleate boiling was identified inside the annulus pipe. The contact angle of water at TDS values of 300 mg/L and 1200 mg/L was 74° and 124°, respectively, showing the improvement in heat transfer characteristics of water due to the presence of TDS materials.
A sensitivity study on the effect of mass distribution of a single-tether spherical point absorber
Publisher: Elsevier BV
Date: 10-2019
Assessment of the thermal performance of a thermosyphon heat pipe using zirconia-acetone nanofluids
Publisher: Elsevier BV
Date: 06-2019
Experimental study of the thermal separation in a vortex tube
Publisher: Elsevier BV
Date: 04-2012
Heat transfer analysis of Ga-In-Sn in a compact heat exchanger equipped with straight micro-passages
Publisher: Elsevier BV
Date: 08-2019
The application of modal analysis to the design of multi-mode point absorber wave energy converters
Publisher: Elsevier BV
Date: 2019
Thermodynamic potential of molten copper oxide for high temperature solar energy storage and oxygen production
Publisher: Elsevier BV
Date: 09-2017
Performance evaluation of thermal soaring unmanned aerial vehicles for coastal surveillance in South Australia
Publisher: American Institute of Aeronautics and Astronautics
Date: 09-01-2012
DOI: 10.2514/6.2012-1182
Simplified method for estimating the take-off weight for short-haul transports
Publisher: Elsevier BV
Date: 03-2000
A new technique for investigating the induced and profile drag coefficients of a smooth wing and a tubercled wing
Publisher: EDP Sciences
Date: 2016
Thermal Assessment of Nano-Particulate Graphene-Water/Ethylene Glycol (WEG 60:40) Nano-Suspension in a Compact Heat Exchanger
Publisher: MDPI AG
Date: 20-05-2019
DOI: 10.3390/EN12101929
Abstract: In the present study, we report the results of the experiments conducted on the convective heat transfer of graphene nano-platelets dispersed in water-ethylene glycol. The graphene nano-suspension was employed as a coolant inside a micro-channel and heat-transfer coefficient (HTC) and pressure drop (PD) values of the system were reported at different operating conditions. The results demonstrated that the use of graphene nano-platelets can potentially augment the thermal conductivity of the working fluid by 32.1% (at wt. % = 0.3 at 60 °C). Likewise, GNP nano-suspension promoted the Brownian motion and thermophoresis effect, such that for the tests conducted within the mass fractions of 0.1%–0.3%, the HTC of the system was improved. However, a trade-off was identified between the PD value and the HTC. By assessing the thermal performance evaluation criteria (TPEC) of the system, it was identified that the thermal performance of the system increased by 21% despite a 12.1% augmentation in the PD value. Furthermore, with an increment in the fluid flow and heat-flux applied to the micro-channel, the HTC was augmented, showing the potential of the nano-suspension to be utilized in high heat-flux thermal applications.
Fluid and heat transfer characteristics of aqueous graphene nanoplatelet (GNP) nanofluid in a microchannel
Publisher: Elsevier BV
Date: 10-2019
Filtration of per- and poly-fluoroalkyl from water and recycling of fluorine: a thermochemical equilibrium analysis
Publisher: Springer Science and Business Media LLC
Date: 08-03-2019
A comparison of NACA 0012 and NACA 0021 self-noise at low Reynolds number
Publisher: Springer Berlin Heidelberg
Date: 18-12-2016
Flow behavior inside a novel rotating fluidized bed for solar gasification of biomass
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4984483
A Novel Solar Expanding-Vortex Particle Reactor: Experimental and Numerical Investigation of the Iso-thermal Flow Field and Particle Deposition
Publisher: Elsevier BV
Date: 08-2016
Spatial and temporal concentration of hydrokinetic energy in the wake of a bluff body
Publisher: Elsevier BV
Date: 09-2018
Pool boiling heat transfer characteristics of iron oxide nano-suspension under constant magnetic field
Publisher: Elsevier BV
Date: 2020
Modelling of wind turbine wake using large eddy simulation
Publisher: Elsevier BV
Date: 2018
A Novel Solar Expanding-Vortex Particle Reactor: Influence of Vortex Structure on Particle Residence Times and Trajectories
Publisher: Elsevier BV
Date: 12-2015
The thermo-chemical potential liquid chemical looping gasification with bismuth oxide
Publisher: Elsevier BV
Date: 03-2019
Numerical investigation of wind loads on an operating heliostat
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4984497
Frequency-tuned surfaces for passive control of wall-bounded turbulent flow – a resolvent analysis study
Publisher: Cambridge University Press (CUP)
Date: 22-03-2023
DOI: 10.1017/JFM.2023.149
Abstract: The potential of frequency-tuned surfaces as a passive control strategy for reducing drag in wall-bounded turbulent flows is investigated using resolvent analysis. These surfaces are considered to have geometries with impedances that permit transpiration and/or slip at the wall in response to wall pressure and/or shear and are tuned to target the dynamically important structures of wall turbulence. It is shown that wall impedance can suppress the modes resembling the near-wall cycle and the very-large-scale motions and the Reynolds stress contribution of these modes. Suppression of the near-wall cycle requires a more reactive impedance. In addition to these dynamically important modes, the effect of wall impedance across the spectral space is analysed by considering varying mode speeds and wavelengths. It is shown that the materials designed for suppression of the near-wall modes lead to gain reduction over a wide range across the spectral space. Furthermore, a wall with only shear-driven impedance is found to suppress turbulent structures over a wider range in spectral space, leading to an overall turbulent drag reduction. Most importantly, the present analysis shows that the drag-reducing impedance is non-unique and the control performance is not sensitive to variations of the surface impedance within a favourable range. This implies that specific frequency bandwidths can be targeted with periodic material design.
Investigation of the atmospheric boundary layer characteristics on gust factor for the calculation of wind load
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4984496
Wind farm noises: mechanisms and evidence for their dependency on wind direction
Publisher: Elsevier BV
Date: 08-2017
Potential of molten lead oxide for liquid chemical looping gasification (LCLG): A thermochemical analysis
Publisher: Elsevier BV
Date: 03-2018
Correlating turbulence intensity and length scale with the unsteady lift force on flat plates in an atmospheric boundary layer flow
Publisher: Elsevier BV
Date: 06-2019
The relative performance of alternative oxygen carriers for liquid chemical looping combustion and gasification
Publisher: Elsevier BV
Date: 06-2017
The economic assessment of micro wind turbines for South Australia
Publisher: Springer Science and Business Media LLC
Date: 27-04-2013
Experimental Investigation on Thermal Performance of a PV/T-PCM (Photovoltaic/Thermal) System Cooling with a PCM and Nanofluid
Publisher: MDPI AG
Date: 04-07-2019
DOI: 10.3390/EN12132572
Abstract: In the present work, an experimental investigation is performed to assess the thermal and electrical performance of a photovoltaic solar panel cooling with multi-walled carbon nanotube–water/ethylene glycol (50:50) nano-suspension (MWCNT/WEG50). The prepared nanofluid was stabilized using an ultrasonic homogenizer together with the addition of 0.1vol% of nonylphenol ethoxylates at pH = 8.9. To reduce the heat loss and to improve the heat transfer rate between the coolant and the panel, a cooling jacket was designed and attached to the solar panel. It was also filled with multi-walled carbon nanotube–paraffin phase change material (PCM) and the cooling pipes were passed through the PCM. The MWCNT/WEG50 nanofluid was introduced into the pipes, while the nano-PCM was in the cooling jacket. The electrical and thermal power of the system and equivalent electrical–thermal power of the system was assessed at various local times and at different mass fractions of MWCNTs. Results showed that with an increase in the mass concentration of the coolant, the electricity and power production were promoted, while with an increase in the mass concentration of the nanofluid, the pumping power was augmented resulting in the decrease in the thermal–electrical equivalent power. It was identified that a MWCNT/WEG50 nano-suspension at 0.2wt% can represent the highest thermal and electrical performance of 292.1 W/m2. It was also identified that at 0.2wt%, ~45% of the electricity and 44% of the thermal power can be produced with a photovoltaic (PV) panel between 1:30 pm to 3:30 pm.
Progress in heliostat development
Publisher: Elsevier BV
Date: 08-2017
Leading-edge vortex development on a pitching flat plate with multiple leading edge geometries
Publisher: Elsevier BV
Date: 09-2018
Investigation of the effect of dielectric barrier discharge plasma actuators on the radar cross section of an object
Publisher: IOP Publishing
Date: 14-07-2011
DOI: 10.1088/0022-3727/44/31/315202
Abstract: The application of dielectric barrier discharge (DBD) plasma as an electromagnetic absorber was investigated by determining the radar cross section (RCS) of a rectangular, flat plate with a DBD plasma actuator array installed on one of its sides. In order to justify the experimental results, the expected effect of plasma actuation on RCS was analysed by determining the attenuation effect of the plasma with the Lorentz model. Due to the very limited life time of the free electrons and the small extent of the plasma sheath, the attenuation was found to be only minimal. The theoretical results have been verified by comparing the measured RCS values of a plate with and without plasma actuation applied on it in a high-frequency anechoic lab. As expected, no significant influence of DBD plasma on RCS was detected. In addition, it was found that the high voltage power supply used as a part of DBD circuitry produced a high level of disturbance even in the microwave range.
Experimental investigation and performance optimisation of a catalytic reforming micro-reactor using response surface methodology
Publisher: Elsevier BV
Date: 11-2019
Hinge and overturning moments due to unsteady heliostat pressure distributions in a turbulent atmospheric boundary layer
Publisher: Elsevier BV
Date: 11-2019
Particle‐Scale Investigation of Heat Transfer in Radiation‐Driven Char Gasification
Publisher: Wiley
Date: 05-09-2016
Experimental investigation of the effects of wind speed and yaw angle on heat losses from a heated cavity
Publisher: Elsevier BV
Date: 05-2018
Demonstration of plausible application of gallium nano-suspension in microchannel solar thermal receiver: experimental assessment of thermo-hydraulic performance of microchannel
Publisher: Elsevier BV
Date: 05-2018
The effect of the boundary layer on the wake of a horizontal axis wind turbine
Publisher: Elsevier BV
Date: 09-2019
The effect of vortex angle on the efficiency of the Ranque-Hilsch vortex tube
Publisher: Elsevier BV
Date: 10-2008
Resonance Responses of Geometrically Imperfect Functionally Graded Extensible Microbeams
Publisher: ASME International
Date: 09-03-2017
DOI: 10.1115/1.4035214
Abstract: This paper aims at analyzing the size-dependent nonlinear dynamical behavior of a geometrically imperfect microbeam made of a functionally graded (FG) material, taking into account the longitudinal, transverse, and rotational motions. The size-dependent property is modeled by means of the modified couple stress theory, the shear deformation and rotary inertia are modeled using the Timoshenko beam theory, and the graded material property in the beam thickness direction is modeled via the Mori–Tanaka homogenization technique. The kinetic and size-dependent potential energies of the system are developed as functions of the longitudinal, transverse, and rotational motions. On the basis of an energy method, the continuous models of the system motion are obtained. Upon application of a weighted-residual method, the reduced-order model is obtained. A continuation method along with an eigenvalue extraction technique is utilized for the nonlinear and linear analyses, respectively. A special attention is paid on the effects of the material gradient index, the imperfection litude, and the length-scale parameter on the system dynamical response.
An Investigation on the Effect of the Hot End Plugs on the Efficiency of the Ranque-Hilsch Vortex Tube
Publisher: Springer Berlin Heidelberg
Date: 2009
Force measurements and wake surveys of a swept tubercled wing
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2017
Comparing the thermodynamic potential of alternative liquid metal oxides for the storage of solar thermal energy
Publisher: Elsevier BV
Date: 11-2017
Experimental assessment of copper oxide for liquid chemical looping for thermal energy storage
Publisher: Elsevier BV
Date: 02-2019
Attenuation of sweep events in a turbulent boundary layer using micro-cavities
Publisher: Springer Science and Business Media LLC
Date: 19-04-2017
Ambient vibration energy harvesters: A review on nonlinear techniques for performance enhancement
Publisher: Elsevier BV
Date: 06-2018
The energetic performance of a liquid chemical looping cycle with solar thermal energy storage
Publisher: Elsevier BV
Date: 03-2019
The working principle of a vortex tube
Publisher: Elsevier BV
Date: 09-2013
The effect of arrangement of two circular cylinders on the maximum efficiency of Vortex-Induced Vibration power using a Scale-Adaptive Simulation model
Publisher: Elsevier BV
Date: 08-2014
Turbulence characteristics in the wake of a heliostat in an atmospheric boundary layer flow
Publisher: AIP Publishing
Date: 04-2020
DOI: 10.1063/5.0005594
Abstract: The mean and spectral characteristics of turbulence in the wake flow of a flat plate model resembling a heliostat in the atmospheric boundary layer flow are investigated in a wind tunnel experiment. Mean velocity and turbulence kinetic energy were characterized in the wake of a heliostat model at three elevation angles up to a distance of eight times the characteristic dimension of the heliostat panel. An increase in turbulence intensity and kinetic energy was found in the wake flow, reaching a peak at a distance equal to approximately twice the characteristic dimension of the heliostat panel. Furthermore, spectral and wavelet analysis of velocity fluctuations in the wake showed that the dominant mechanism in the immediate downstream of the plate was the breakdown of large inflow turbulence structures to smaller scales. In the end, the wake-induced turbulence patterns and wind loads in a heliostat field were discussed. It was found that compared to a heliostat at the front row, the heliostats positioned in high-density regions of a field were subjected to a higher turbulence intensity and, consequently, larger dynamic wind loading. The results show that it is necessary to consider the increased unsteady wind loads for the design of a heliostat in high-density regions of a field, where the gap between the rows is less than three-times the characteristic length of the heliostat panel.
The influence of wall temperature distribution on the mixed convective losses from a heated cavity
Publisher: Elsevier BV
Date: 06-2019
An optimal arrangement of mooring lines for the three-tether submerged point-absorbing wave energy converter
Publisher: Elsevier BV
Date: 08-2016
Influence of the type of oxygen carriers on the performance of a hybrid solar chemical looping combustion system
Publisher: No publisher found
Date: 2014
DOI: 10.1021/EF402542B
Experimental investigation of the reduction of liquid bismuth oxide with graphite
Publisher: Elsevier BV
Date: 06-2019
Finite-length porous surfaces for control of a turbulent boundary layer
Publisher: AIP Publishing
Date: 04-2022
DOI: 10.1063/5.0084505
Abstract: This study investigates the potential of finite-length porous surfaces with a subsurface chamber for the control of the turbulent boundary layer. The effect of the subsurface chamber on the boundary layer is investigated by hot-wire anemometry measurements of the boundary layer response to different chamber configurations. Three different chamber configurations were investigated: a common cavity that connected the array of surface perforations, a locally reacting chamber with in idual cavities underneath each perforation, and chambers that connected the perforations in streamwise or spanwise flow directions. It was found that a common backing cavity and in idual cavities reduced the peak turbulence intensity, whereas the test case with streamwise or spanwise channels increased the turbulence intensity and strengthened large-scale turbulent structures within the boundary layer. While both common and in idual cavities were effective in reducing turbulence, the in idual cavities created a larger reduction in the pre-multiplied spectrum with an average of 80% at large scales compared to between 40% and 60% reduction at large scales for common cavities with different volumes. Hence, a short porous surface with in idual cavities underneath each perforation was found to be the most effective turbulence-reducing configuration among the investigated cases.
A review of static and dynamic heliostat wind loads
Publisher: Elsevier BV
Date: 09-2021
Performance effects of a single tubercle terminating at a swept wing’s tip
Publisher: Elsevier BV
Date: 07-2017
Contact angle and heat transfer characteristics of a gravity-driven film flow of a particulate liquid metal on smooth and rough surfaces
Publisher: Elsevier BV
Date: 02-2019
Effect of turbulence characteristics in the atmospheric surface layer on the peak wind loads on heliostats in stow position
Publisher: Elsevier BV
Date: 11-2017
Effects of wind speed changes on wake instability of a wind turbine in a virtual wind tunnel using large eddy simulation
Publisher: Elsevier BV
Date: 06-2013
Marangoni effect on the thermal performance of glycerol/water mixture in microchannel
Publisher: Elsevier BV
Date: 10-2019
Convective heat loss from a bladed solar receiver
Publisher: AIP Publishing
Date: 2019
DOI: 10.1063/1.5117571
A critical review of temperature separation in a vortex tube
Publisher: Elsevier BV
Date: 11-2010
Experimental study of the flow structure in a counter flow Ranque-Hilsch vortex tube
Publisher: Elsevier BV
Date: 10-2012
Techno-economic assessment of the application of small-scale wind turbines
Publisher: Informa UK Limited
Date: 12-2012
Sea-state based maximum power point tracking damping control of a fully submerged oscillating buoy
Publisher: Elsevier BV
Date: 11-2016
Effect of shape of the stenosis on the hemodynamics of a stenosed coronary artery
Publisher: AIP Publishing
Date: 08-2021
DOI: 10.1063/5.0058765
Abstract: In this study, the effect of the shape of the stenosis on the flow transition in an artery is investigated. Different shapes of the stenosis including round, oval, elongated, half-moon, bean-shape, and crescent with and without eccentricity at a constant degree of stenosis (73%) are studied. A computational model, validated against the in-house Particle Image Velocimetry experimental results, is used to investigate the flow behavior. The results showed that the length of the jet region after the stenotic section varies significantly for different shapes of the stenosis. Based on the analysis of turbulent kinetic energy, power spectral density, and the spectral entropy of stream-wise velocity fluctuations, it was shown that eddies are formed after the dissipation of jet flow downstream of the stenosis. It was also shown that the intensity of the velocity fluctuations differs for different shapes of the stenosis. Furthermore, using the proper orthogonal decomposition method, it was shown that the shape of the stenosis has a significant impact on the downstream coherent structures. It was found that regardless of the degree of stenosis, specific shapes of the stenosis, such as round concentric, create less serious hemodynamic complications compared to the other shapes of the stenosis.
Interaction of a flow-excited Helmholtz resonator with a grazing turbulent boundary layer
Publisher: Elsevier BV
Date: 10-2014
Reforming of methanol with steam in a micro-reactor with Cu–SiO2 porous catalyst
Publisher: Elsevier BV
Date: 07-2019
Effect of a rigid wall on the vortex induced vibration of two staggered circular cylinders
Publisher: AIP Publishing
Date: 05-2014
DOI: 10.1063/1.4879275
Abstract: Vortex Induced Vibrations (VIVs) play a key role in a wide range of engineering applications including the extraction of renewable energy. In this paper, numerical studies of the phenomenon of VIV were conducted to investigate the flow behaviour around two identical circular cylinders. The upstream cylinder was located in the vicinity of a rigid wall and downstream one was mounted on an elastic support with one degree of freedom. The Reynolds number based on the cylinder's diameter was kept constant at 8700, while the separation between the upstream cylinder and the wall was varied. The results show that this separation distance known as the gap ratio has a significant effect on the dynamic behaviour of the upstream and downstream cylinders. Accordingly, the interaction of shear layers between the upstream cylinder and the rigid wall has a strong influence on the vortex dynamics of both cylinders, in particular, when the upstream cylinder was mounted close to the wall. In this arrangement, a jet flow produced in the wake of the upstream cylinder significantly affects the vortex shedding frequency, and the lift and drag coefficients of both cylinders. This can alter the dynamic response of the downstream cylinder and theoretical efficiency of the VIV power.
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