ORCID Profile
0000-0002-2762-5348
Current Organisations
Universidad de Antioquia
,
University of Western Australia
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: ASMEDC
Date: 2008
Abstract: The adsorption isotherms and kinetics of gaseous methane onto highly porous activated carbon (Maxsorb-III) at temperatures ranging from 278 to 333 K and at different equilibrium pressures between 0.1 and 2.0 MPa have been experimentally measured by the desorption method unlike volumetric or thermo-gravimetric apparatus. The thermophysical properties such as skeletal density, BET surface area, pore size, pore volume and the total porosity of Maxsorb-III have been determined. The Dubinin-Astakhov (DA) and Langmuir isotherm models are found to fit well all of the experimental data within the experimental errors. The experimental isotherms and the computed isosteric heat of adsorption are compared with the measurements of similar specimens of activated carbon of other researchers, and found to be consistent. The present isotherm and isosteric heat data are useful for designing environmentally benign adsorption cooling and storage systems.
Publisher: ASMEDC
Date: 2002
Abstract: In this paper, we investigate the effects of laminar double-diffusive natural convection on directional solidification of binary fluids when cooled and solidified from the top. The study is performed using aqueous ammonium chloride solution as the model fluid. The experiments are performed with an initial concentration of ammonium chloride is less than the eutectic composition, leading to an aiding double-diffusive convection. In this case, solidification leads to the formation of a diffused matrix of dendritic crystals (mushy region) separating the pure solid and liquid regions. Below the two-phase mushy region, Rayleigh-Benard type of cellular convective motions are observed. The cellular motions, which are caused by thermal buoyancy, die once the thickness of the liquid layer falls below a critical value. The features of convective transport are visualised using a sheet of laser light scattered through neutrally buoyant glass particles seeded in the solution. Numerical simulations are also performed, and the agreement with experimental results is found to be good.
Publisher: Elsevier BV
Date: 07-2010
Publisher: Elsevier BV
Date: 04-2013
Publisher: American Chemical Society (ACS)
Date: 02-02-2001
DOI: 10.1021/JE000277E
Publisher: Elsevier BV
Date: 11-2010
Publisher: Wiley
Date: 16-02-2006
Publisher: Elsevier BV
Date: 03-2005
Publisher: Elsevier BV
Date: 08-2008
Publisher: Elsevier BV
Date: 10-2016
Publisher: American Society of Mechanical Engineers
Date: 16-06-2014
DOI: 10.1115/GT2014-26928
Abstract: In this paper, a detailed thermodynamic performance analysis of a transcritical condensing (TC) cycle is performed with pure CO2 and a blend of 48.5 % propane with 51.5 % CO2 as working fluids. A realistic thermodynamic model is used incorporating irreversibilities in turbo-machineries and heat exchangers. The Key finding is that the addition of propane elevates the heat rejection temperature, but does not impair any of the performance indicators. Such a fluid may be useful for power generation in concentrated solar power applications by using which a hike of up to 2 % can be realized in the thermal efficiency of a power plant.
Publisher: American Chemical Society (ACS)
Date: 10-03-2010
DOI: 10.1021/JE900959W
Publisher: American Chemical Society (ACS)
Date: 22-05-2009
DOI: 10.1021/JE900236P
Publisher: Elsevier BV
Date: 11-2006
Publisher: Elsevier BV
Date: 06-1996
Publisher: World Scientific Pub Co Pte Lt
Date: 20-08-2006
DOI: 10.1142/S0217751X06032472
Abstract: We discuss Kaluza–Klein (KK) decomposition in five-dimensional (5D) field theories with orbifold compactification. Kinetic terms localized at orbifold fixed points, which are inevitably present in any realistic model, modify the standard KK mass spectrum and interactions of KK modes. This, in turn, can significantly affect phenomenology of the orbifold models. As an ex le, we discuss gauge coupling unification in N = 1 supersymmetric 5D orbifold SU(5) model. We have found that uncertainties in the predictions of the model related to modification of the KK masses are large and essentially uncontrollable.
Publisher: Elsevier BV
Date: 04-2013
Publisher: Elsevier BV
Date: 11-2000
Publisher: Elsevier BV
Date: 03-2015
Publisher: Elsevier BV
Date: 12-2003
Publisher: Elsevier BV
Date: 10-1996
Publisher: Begell House
Date: 2015
Publisher: ASME International
Date: 03-2008
DOI: 10.1115/1.2804948
Abstract: This paper deals with phase change material (PCM), used in conjunction with thermal conductivity enhancer (TCE), as a means of thermal management of electronic systems. Eicosane is used as PCM, while aluminium pin or plate fins are used as TCE. The test section considered in all cases is a 42×42mm2 base with a TCE height of 25mm. An electrical heater at the heat sink base is used to simulate the heat generation in electronic chips. Various volumetric fractions of TCE in the conglomerate of PCM and TCE are considered. The case with 8% TCE volume fraction was found to have the best thermal performance. With this volume fraction of TCE, the effects of fin dimension and fin shape are also investigated. It is found that a large number of small cross-sectional area fins is preferable. A numerical model is also developed to enable an interpretation of experimental results.
Publisher: Institution of Engineering and Technology (IET)
Date: 05-1999
Publisher: Elsevier BV
Date: 2000
Publisher: Elsevier BV
Date: 07-2016
Publisher: Elsevier BV
Date: 09-2000
Publisher: Wiley
Date: 09-05-2003
DOI: 10.1002/MOP.10962
Publisher: ASME International
Date: 20-01-2016
DOI: 10.1115/1.4032007
Abstract: The present work describes a silica gel + water adsorption-based desalination and chiller system, an emerging low cost process of integrating thermal desalination and cooling by utilizing low-grade heat. The cycle employs a combination of flash evaporation and thermal compression of steam in single/two stage to generate the dual effect. The current study aims at simulating a four-bed/stage adsorption system using energy and mass balance along with kinetics of adsorption. The performance of single- and two-stage adsorption systems is compared for ambient temperatures in the range of 25–45 °C and a constant heat source temperature of 85 °C.
Publisher: Elsevier BV
Date: 03-2013
Publisher: Elsevier BV
Date: 03-2007
Publisher: Elsevier BV
Date: 1996
Publisher: Elsevier BV
Date: 1999
Publisher: IOP Publishing
Date: 14-12-1996
Publisher: Informa UK Limited
Date: 08-1990
Publisher: IOP Publishing
Date: 14-03-1993
Publisher: Elsevier BV
Date: 12-2008
Publisher: Elsevier BV
Date: 10-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2007
Publisher: Elsevier BV
Date: 2001
Publisher: Elsevier BV
Date: 03-2008
Publisher: Elsevier BV
Date: 2001
Publisher: Springer Science and Business Media LLC
Date: 14-09-2019
Publisher: Elsevier BV
Date: 03-2006
Publisher: Elsevier BV
Date: 2004
Publisher: American Chemical Society (ACS)
Date: 19-07-2008
DOI: 10.1021/JE800204P
Publisher: Elsevier BV
Date: 07-2011
Publisher: Elsevier BV
Date: 06-2006
Publisher: American Chemical Society (ACS)
Date: 13-01-2009
DOI: 10.1021/LA803289P
Abstract: Thermodynamic property surfaces for a single-component adsorbent+adsorbate system are derived and developed from the viewpoint of classical thermodynamics, thermodynamic requirements of chemical equilibrium, Gibbs law, and Maxwell relations. They enable us to compute the entropy and enthalpy of the adsorbed phase, the isosteric heat of adsorption, specific heat capacity, and the adsorbed phase volume thoroughly. These equations are very simple and easy to handle for calculating the energetic performances of any adsorption system. We have shown here that the derived thermodynamic formulations fill up the information gap with respect to the state of adsorbed phase to dispel the confusion as to what is the actual state of the adsorbed phase. We have also discussed and established the temperature-entropy diagrams of (i) CaCl2-in-silica gel+water system for cooling applications, and (ii) activated carbon (Maxsorb III)+methane system for gas storage.
Publisher: Elsevier BV
Date: 03-2005
Publisher: Elsevier BV
Date: 08-2011
Publisher: Elsevier BV
Date: 10-2016
Publisher: American Chemical Society (ACS)
Date: 04-12-2009
DOI: 10.1021/JE800458K
Publisher: Hindawi Limited
Date: 07-2012
Publisher: Elsevier BV
Date: 02-2016
Publisher: Elsevier BV
Date: 11-2014
Publisher: American Chemical Society (ACS)
Date: 13-10-2010
DOI: 10.1021/JE900775N
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 04-2007
DOI: 10.2514/1.26222
Publisher: Elsevier BV
Date: 2011
Publisher: Elsevier BV
Date: 05-2013
Publisher: Hindawi Limited
Date: 05-1998
DOI: 10.1002/(SICI)1099-114X(199805)22:6<579::AID-ER387>3.0.CO;2-U
Publisher: Elsevier BV
Date: 2012
Publisher: American Chemical Society (ACS)
Date: 09-02-2012
DOI: 10.1021/IE2028393
Publisher: AIP Publishing
Date: 10-09-2007
DOI: 10.1063/1.2780117
Abstract: This letter presents a thermodynamic formulation to calculate the minimum driving heat source temperature of an advanced solid sorption cooling device, and it is validated with experimental data. This formalism has been developed from the rigor of the Boltzmann distribution function and the condensation approximation of adsorptive molecules. An interesting and useful finding has been established from this formalism that it is possible to construct a solid sorption refrigeration device that operates in a cycle transferring heat from a low temperature source to a heat sink with a driving heat source at a temperature close to but above ambient.
Publisher: Elsevier BV
Date: 07-2004
Publisher: Elsevier BV
Date: 02-2006
DOI: 10.1016/J.YMPEV.2005.11.001
Abstract: Demosponge higher-level systematics is currently a subject of major changes due to the simplicity and paucity of complex morphological characters. Still, sponge classification is primarily based on morphological features. The systematics of the demosponge order Agelasida has been exceptionally problematic in the past. Here, we present the first molecular phylogenetic analysis based on three partially independent genes in demosponges in combination with a comprehensive search for biochemical synapomorphies to indicate their phylogenetic relationships. We show how sponges with fundamentally different skeletons can be in fact closely related and discuss ex les of the misleading nature of morphological systematics in sponges.
Publisher: American Chemical Society (ACS)
Date: 11-04-2014
DOI: 10.1021/IE500578V
Publisher: Elsevier BV
Date: 2013
Publisher: SAGE Publications
Date: 08-2005
Abstract: The objective of this paper is to report new data for flow of gases, liquids, and liquid mixtures in 11 m long micro-channels. Three test sections of the following dimensions (a) 1.5 mm deep × 0.75 mm wide (MC1), (b) 0.5 mm deep × 0.95 mm wide (MC2), and (c) 0.3 mm deep × 1.0 mm wide (MC3) were cut in a serpentine form on a stainless steel substrate. The gases studied were air, nitrogen, and oxygen. The liquids used were ethanol, methanol, and their mixtures. The measured flow rate and pressure drop were used to evaluate friction factors in the micro-channels. Analysis of friction factor versus Reynolds number relation shows a perceptible dependence on channel dimensions. Transitions to turbulent regime were identified by a change in slope of friction factor versus Reynolds number curve. Transitions were mild and occurred at lower Reynolds numbers than in normal channels. The results are interpreted in terms of a channel geometry parameter.
Publisher: Elsevier BV
Date: 08-2009
Publisher: ASMEDC
Date: 2009
Abstract: This article presents a thermodynamic framework for the estimation of the minimum driving heat source temperature of an advanced adsorption cooling device from the rigor of Boltzmann distribution function and the condensation approximation of adsorptive molecules on adsorbent porous surface. The calculated resuls are validated with our own experimentally measured data. From this thermodynamic analysis, an interesting and useful finding has been established that it is possible to develop an adsorption cooling device that operates with a driving heat source temperature as low as 40 °C along with a coolant of temperature 30 °C. We have also presented here the thermodynamic modeling and experimental investigation of an advanced adsorption chiller for understanding its working principles.
Publisher: Elsevier BV
Date: 2005
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 2002
Publisher: Springer Science and Business Media LLC
Date: 1998
Publisher: Elsevier BV
Date: 10-1997
Publisher: Informa UK Limited
Date: 26-09-2013
Publisher: SAGE Publications
Date: 11-2005
Abstract: This article presents data on forced convective heat transfer for fluids in a 11-m long rectangular (0.75 mm wide × 1.5 mm deep) serpentine-type mini-channel. The test section was fabricated by electro-discharge machining of a 2-mm thick stainless steel plate. The flow media experimented were air, ethanol, methanol, and their mixtures. Both laminar and turbulent flow regimes were covered in the case of liquids, but only turbulent regime was covered with air. The heat transfer coefficient is evaluated based on the heat carried away by the coolant and an average wall to mean fluid temperature difference. The Nusselt number is correlated through empirical correlations involving Reynolds number and Prandtl number, the hydraulic diameter being the length parameter.
Publisher: Elsevier BV
Date: 11-2014
Publisher: Elsevier BV
Date: 2000
Publisher: Elsevier BV
Date: 12-2003
Publisher: Elsevier BV
Date: 10-2015
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2009
Publisher: American Chemical Society (ACS)
Date: 16-10-2007
DOI: 10.1021/JE700369J
Publisher: American Chemical Society (ACS)
Date: 05-2009
DOI: 10.1021/LA900217T
Abstract: The Henry coefficients of a single component adsorbent + adsorbate system are calculated from experimentally measured adsorption isotherm data, from which the heat of adsorption at zero coverage is evaluated. The first part of the papers relates to the development of thermodynamic property surfaces for a single-component adsorbent+adsorbate system (Chakraborty, A. Saha, B. B. Ng, K. C. Koyama, S. Srinivasan, K. Langmuir 2009, 25, 2204). A thermodynamic framework is presented to capture the relationship between the specific surface area (Ai) and the energy factor, and the surface structural and the surface energy heterogeneity distribution factors are analyzed. Using the outlined approach, the maximum possible amount of adsorbate uptake has been evaluated and compared with experimental data. It is found that the adsorbents with higher specific surface areas tend to possess lower heat of adsorption (DeltaH degrees) at the Henry regime. In this paper, we have established the definitive relation between Ai and DeltaH degrees for (i) carbonaceous materials, metal organic frameworks (MOFs), carbon nanotubes, zeolites+hydrogen, and (ii) activated carbons+methane systems. The proposed theoretical framework of Ai and DeltaH degrees provides valuable guides for researchers in developing advanced porous adsorbents for methane and hydrogen uptake.
Publisher: SAGE Publications
Date: 2012
Abstract: This paper lists the values of slope properties of entropy, enthalpy and exergy along isotherms, isochors, isobars and isentropes in terms of properties that can be primarily measured, namely pressure, volume, temperature, their slopes derivable from equations of state and one of the specific heats in the ideal gas state. It is also shown that all these slopes can be expressed in terms of a coefficient of thermal expansion and isothermal compressibility as well. These could be useful as an educational tool in chemical and mechanical engineering.
Publisher: Elsevier BV
Date: 05-2000
Publisher: Elsevier BV
Date: 2013
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1CP20383E
Abstract: We propose a new method for evaluating the adsorbed phase volume during physisorption of several gases on activated carbon specimens. We treat the adsorbed phase as another equilibrium phase which satisfies the Gibbs equation and hence assume that the law of rectilinear diameters is applicable. Since invariably the bulk gas phase densities are known along measured isotherms, the constants of the adsorbed phase volume can be regressed from the experimental data. We take the Dubinin-Astakhov isotherm as the model for verifying our hypothesis since it is one of the few equations that accounts for adsorbed phase volume changes. In addition, the pseudo-saturation pressure in the supercritical region is calculated by letting the index of the temperature term in Dubinin's equation to be temperature dependent. Based on over 50 combinations of activated carbons and adsorbates (nitrogen, oxygen, argon, carbon dioxide, hydrocarbons and halocarbon refrigerants) it is observed that the proposed changes fit experimental data quite well.
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 09-2023
Publisher: Elsevier BV
Date: 03-2013
Publisher: American Chemical Society (ACS)
Date: 13-09-2013
DOI: 10.1021/JE4005678
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Kandadai Srinivasan.