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R Sivaraj - One of the best experts on this subject based on the ideXlab platform.

  • influence of higher order chemical reaction and non uniform heat source sink on casson fluid flow over a vertical cone and flat plate
    Journal of Molecular Liquids, 2016
    Co-Authors: D Mythili, R Sivaraj
    Abstract:

    Abstract The present study focuses on the effects of surface dependent heat source/sink, viscosity and Thermal Conductivity Variations on unsteady flow of Casson fluid over a vertical cone and flat plate with the influence of Thermal radiation, temperature dependent heat source/sink and higher order chemical reaction effects. The model which is constituted with highly nonlinear governing equations is solved numerically by an efficient finite difference scheme of Crank–Nicolson type. Numerical calculations are carried out and reported graphically for various parametric conditions to show interesting aspects of the solution on flow, heat and mass transfer characteristics of this problem. Results indicate that the hydrodynamic and Thermal boundary layer thickness decrease for higher values of Thermal radiation parameter. The fluid flow and heat transfer are appreciably influenced by the temperature dependent heat source/sink parameter. The flow and heat transfer characteristics of this problem are also regulated by surface dependent heat source/sink, viscosity and Thermal Conductivity Variation parameters.

  • Influence of higher order chemical reaction and non-uniform heat source/sink on Casson fluid flow over a vertical cone and flat plate
    Journal of Molecular Liquids, 2016
    Co-Authors: D Mythili, R Sivaraj
    Abstract:

    Abstract The present study focuses on the effects of surface dependent heat source/sink, viscosity and Thermal Conductivity Variations on unsteady flow of Casson fluid over a vertical cone and flat plate with the influence of Thermal radiation, temperature dependent heat source/sink and higher order chemical reaction effects. The model which is constituted with highly nonlinear governing equations is solved numerically by an efficient finite difference scheme of Crank–Nicolson type. Numerical calculations are carried out and reported graphically for various parametric conditions to show interesting aspects of the solution on flow, heat and mass transfer characteristics of this problem. Results indicate that the hydrodynamic and Thermal boundary layer thickness decrease for higher values of Thermal radiation parameter. The fluid flow and heat transfer are appreciably influenced by the temperature dependent heat source/sink parameter. The flow and heat transfer characteristics of this problem are also regulated by surface dependent heat source/sink, viscosity and Thermal Conductivity Variation parameters.

Karl Joulain - One of the best experts on this subject based on the ideXlab platform.

  • Thermophysical characterisation of VO2 thin films hysteresis and its application in Thermal rectification
    Scientific Reports, 2019
    Co-Authors: Georges Hamaoui, C. L. Gomez-heredia, J. A. Ramirez-rincon, Younès Ezzahri, Corinne Champeaux, José Ordonez-miranda, Nicolas Horny, Frédéric Dumas-bouchiat, Jose Alvarado-gil, Karl Joulain
    Abstract:

    Hysteresis loops exhibited by the thermophysical properties of VO2 thin films deposited on either a sapphire or silicon substrate have been experimentally measured using a high frequency photoThermal radiometry technique. This is achieved by directly measuring the Thermal diffusivity and Thermal effusivity of the VO2 films during their heating and cooling across their phase transitions, along with the film-substrate interface Thermal boundary resistance. These Thermal properties are then used to determine the Thermal Conductivity and volumetric heat capacity of the VO2 films. A 2.5 enhancement of the VO2 Thermal Conductivity is observed during the heating process, while its volumetric heat capacity does not show major changes. This sizeable Thermal Conductivity Variation is used to model the operation of a conductive Thermal diode, which exhibits a rectification factor about 30% for small temperature differences (≈70 °C) on its terminals. The obtained results grasp thus new insights on the control of heat currents.

  • Thermophysical characterisation of VO_2 thin films hysteresis and its application in Thermal rectification
    Scientific Reports, 2019
    Co-Authors: Georges Hamaoui, C. L. Gomez-heredia, J. A. Ramirez-rincon, Juan Jose Alvarado-gil, Younès Ezzahri, Corinne Champeaux, José Ordonez-miranda, Nicolas Horny, Frédéric Dumas-bouchiat, Karl Joulain
    Abstract:

    Hysteresis loops exhibited by the thermophysical properties of VO_2 thin films deposited on either a sapphire or silicon substrate have been experimentally measured using a high frequency photoThermal radiometry technique. This is achieved by directly measuring the Thermal diffusivity and Thermal effusivity of the VO_2 films during their heating and cooling across their phase transitions, along with the film-substrate interface Thermal boundary resistance. These Thermal properties are then used to determine the Thermal Conductivity and volumetric heat capacity of the VO_2 films. A 2.5 enhancement of the VO_2 Thermal Conductivity is observed during the heating process, while its volumetric heat capacity does not show major changes. This sizeable Thermal Conductivity Variation is used to model the operation of a conductive Thermal diode, which exhibits a rectification factor about 30% for small temperature differences (≈70 °C) on its terminals. The obtained results grasp thus new insights on the control of heat currents.

D Mythili - One of the best experts on this subject based on the ideXlab platform.

  • influence of higher order chemical reaction and non uniform heat source sink on casson fluid flow over a vertical cone and flat plate
    Journal of Molecular Liquids, 2016
    Co-Authors: D Mythili, R Sivaraj
    Abstract:

    Abstract The present study focuses on the effects of surface dependent heat source/sink, viscosity and Thermal Conductivity Variations on unsteady flow of Casson fluid over a vertical cone and flat plate with the influence of Thermal radiation, temperature dependent heat source/sink and higher order chemical reaction effects. The model which is constituted with highly nonlinear governing equations is solved numerically by an efficient finite difference scheme of Crank–Nicolson type. Numerical calculations are carried out and reported graphically for various parametric conditions to show interesting aspects of the solution on flow, heat and mass transfer characteristics of this problem. Results indicate that the hydrodynamic and Thermal boundary layer thickness decrease for higher values of Thermal radiation parameter. The fluid flow and heat transfer are appreciably influenced by the temperature dependent heat source/sink parameter. The flow and heat transfer characteristics of this problem are also regulated by surface dependent heat source/sink, viscosity and Thermal Conductivity Variation parameters.

  • Influence of higher order chemical reaction and non-uniform heat source/sink on Casson fluid flow over a vertical cone and flat plate
    Journal of Molecular Liquids, 2016
    Co-Authors: D Mythili, R Sivaraj
    Abstract:

    Abstract The present study focuses on the effects of surface dependent heat source/sink, viscosity and Thermal Conductivity Variations on unsteady flow of Casson fluid over a vertical cone and flat plate with the influence of Thermal radiation, temperature dependent heat source/sink and higher order chemical reaction effects. The model which is constituted with highly nonlinear governing equations is solved numerically by an efficient finite difference scheme of Crank–Nicolson type. Numerical calculations are carried out and reported graphically for various parametric conditions to show interesting aspects of the solution on flow, heat and mass transfer characteristics of this problem. Results indicate that the hydrodynamic and Thermal boundary layer thickness decrease for higher values of Thermal radiation parameter. The fluid flow and heat transfer are appreciably influenced by the temperature dependent heat source/sink parameter. The flow and heat transfer characteristics of this problem are also regulated by surface dependent heat source/sink, viscosity and Thermal Conductivity Variation parameters.

Georges Hamaoui - One of the best experts on this subject based on the ideXlab platform.

  • Thermophysical characterisation of VO2 thin films hysteresis and its application in Thermal rectification
    Scientific Reports, 2019
    Co-Authors: Georges Hamaoui, C. L. Gomez-heredia, J. A. Ramirez-rincon, Younès Ezzahri, Corinne Champeaux, José Ordonez-miranda, Nicolas Horny, Frédéric Dumas-bouchiat, Jose Alvarado-gil, Karl Joulain
    Abstract:

    Hysteresis loops exhibited by the thermophysical properties of VO2 thin films deposited on either a sapphire or silicon substrate have been experimentally measured using a high frequency photoThermal radiometry technique. This is achieved by directly measuring the Thermal diffusivity and Thermal effusivity of the VO2 films during their heating and cooling across their phase transitions, along with the film-substrate interface Thermal boundary resistance. These Thermal properties are then used to determine the Thermal Conductivity and volumetric heat capacity of the VO2 films. A 2.5 enhancement of the VO2 Thermal Conductivity is observed during the heating process, while its volumetric heat capacity does not show major changes. This sizeable Thermal Conductivity Variation is used to model the operation of a conductive Thermal diode, which exhibits a rectification factor about 30% for small temperature differences (≈70 °C) on its terminals. The obtained results grasp thus new insights on the control of heat currents.

  • Thermophysical characterisation of VO_2 thin films hysteresis and its application in Thermal rectification
    Scientific Reports, 2019
    Co-Authors: Georges Hamaoui, C. L. Gomez-heredia, J. A. Ramirez-rincon, Juan Jose Alvarado-gil, Younès Ezzahri, Corinne Champeaux, José Ordonez-miranda, Nicolas Horny, Frédéric Dumas-bouchiat, Karl Joulain
    Abstract:

    Hysteresis loops exhibited by the thermophysical properties of VO_2 thin films deposited on either a sapphire or silicon substrate have been experimentally measured using a high frequency photoThermal radiometry technique. This is achieved by directly measuring the Thermal diffusivity and Thermal effusivity of the VO_2 films during their heating and cooling across their phase transitions, along with the film-substrate interface Thermal boundary resistance. These Thermal properties are then used to determine the Thermal Conductivity and volumetric heat capacity of the VO_2 films. A 2.5 enhancement of the VO_2 Thermal Conductivity is observed during the heating process, while its volumetric heat capacity does not show major changes. This sizeable Thermal Conductivity Variation is used to model the operation of a conductive Thermal diode, which exhibits a rectification factor about 30% for small temperature differences (≈70 °C) on its terminals. The obtained results grasp thus new insights on the control of heat currents.

Abdul Alim - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Temperature Dependent Thermal Conductivity and Viscous Dissipation on Free Convective Flow along a Vertical Flat Plate with Asymptotic Solution
    GANIT: Journal of Bangladesh Mathematical Society, 2017
    Co-Authors: Akm Safiqul Islam, Abdul Alim, Rezaul Karim, Atm M Rahman
    Abstract:

    This paper reports us the surface temperature distribution effects of free convective flow along a vertical flat plate with temperature dependent Thermal Conductivity and viscous dissipation with asymptotic solution. The governing equations with associated boundary conditions reduce to local non-similarity boundary layer equations for this phenomenon are converted to dimensionless forms using a suitable transformation. The transformed non-linear equations are then solved using the implicit finite difference method together with Keller-box technique. Numerical results of the velocity and temperature profiles, skin friction and surface temperature profiles for different values of the Thermal Conductivity Variation parameter, the Prandtl number and the viscous dissipation parameters are presented graphically. Also we considered the asymptotic solution for the effect of the Thermal Conductivity Variation parameter, the Prandtl number and the viscous dissipation parameters in skin friction and surface temperature profiles. Detailed discussion is given for the aforementioned parameters. A good similarity is found in small and large value solution with all value solution for the Thermal Conductivity Variation parameter, the Prandtl number and the viscous dissipation parameter for skin friction and surface temperature. Divergence is found near one (1). GANIT J. Bangladesh Math. Soc. Vol. 36 (2016) 33-46

  • Effects of Conduction Variation on MHD Natural Convection Flow along a Vertical Flat Plate with Thermal Conductivity
    Journal of Scientific Research, 2016
    Co-Authors: A. K. M. S. Islam, Abdul Alim, M. R. Karim, Atm M Rahman
    Abstract:

    This paper reports the effect of conduction Variation of free convection flow along a vertical flat plate on magnetohydrodynamic (MHD) with Thermal Conductivity. The governing equations with associated boundary conditions reduce to local non-similarity boundary layer equations for this phenomenon are converted to dimensionless forms using a suitable transformation. The transformed non-linear equations are then solved using the implicit finite difference method together with Keller-box technique. Numerical results of the velocity and temperature profiles, skin friction and surface temperature profiles for different values of the magnetic parameter, the Thermal Conductivity Variation parameter, the Prandtl number and the conduction Variation parameters are presented graphically. Detailed discussion is given for the effect of the aforementioned parameters. Opposite scenario is found in skin friction and surface temperature for the Thermal Conductivity Variation parameter. Significant effect is found in skin friction and surface temperature for conduction Variation parameter.

  • Entropy Generation for MHD Radiative Variable Thermal Conductivity Nanofluid Flow through Porous Channel
    Thammasat International Journal of Science and Technology, 2016
    Co-Authors: Sarwar Alam, Abdul Hakim Khan, Abdul Alim
    Abstract:

    The radiative heat transfer performance with viscous dissipation on entropy generation in the MHD flow of variable Thermal Conductivity viscous Cu–water nanofluid through a porous parallel channel is investigated in this paper. The governing non-linear differential equations are solved using power series for small values of Thermal Conductivity Variation parameter, which are then analysed by Hermite- Pade approximation method. The effects of the physical governing flow parameters on velocity, temperature and entropy generation are discussed extensively both numerically and graphically. A stability analysis has been performed for the local rate of heat transfer which signifies that the lower solution branch is stable and physically acceptable. The entropy generation of the system increases at the two porous plates and also the fluid friction irreversibility is dominant there.

  • Free Convective Heat Transfer Flow of Temperature Dependent Thermal Conductivity Along a Vertical Flat Plate with Heat Generation
    Procedia Engineering, 2014
    Co-Authors: Akm Safiqul Islam, Abdul Alim, Rezaul Karim
    Abstract:

    Abstract The natural convection heat transfer flow of temperature dependent Thermal Conductivity on an electrically conducting fluid along a vertical flat plate with heat generation have been investigated in this paper. The governing equations with associated boundary conditions for this phenomenon are converted to dimensionless forms using a suitable transformation. The transformed non-linear equations are then solved using the implicit finite difference method. Numerical results of the velocity and temperature profiles for Prandtl number and heat generation parameter, skin friction and local rate of heat transfer profiles for different values of the Thermal Conductivity Variation parameter, Prandtl number and heat generation parameters are presented graphically. Detailed discussion is given for the effects of the aforementioned parameters. Significant effects are found in velocity and temperature profiles for Prandtl number. Remarkable effects are found in skin friction and heat transfer for heat generation parameter. Also significant effect is found in heat transfer for Thermal Conductivity Variation parameter.

  • Effects of temperature dependent Thermal Conductivity on natural convection flow along a vertical flat plate with heat generation
    Journal of Naval Architecture and Marine Engineering, 2012
    Co-Authors: Akm Safiqul Islam, Abdul Alim, Abdullah-al-noman Sarker, A. F. M. Khodadad Khan
    Abstract:

    The effects of temperature dependent Thermal Conductivity on natural convection flow of an electrically conducting fluid along a vertical flat plate with heat generation have been investigated in this paper. The governing equations with associated boundary conditions for this phenomenon are converted to dimensionless forms using a suitable transformation. The transformed non-linear equations are then solved using the implicit finite difference method. Numerical results of the velocity and temperature profiles, skin friction coefficient and surface temperature profiles for different values of the Thermal Conductivity Variation parameter, Prandtl number and heat generation parameter s are presented graphically. Detailed discussion is given for the effects of the aforementioned parameters. DOI: http://dx.doi.org/10.3329/jname.v9i2.9025 Journal of Naval Architecture and Marine Engineering 9(2012) 113-122