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Ammar I. Alsabery - One of the best experts on this subject based on the ideXlab platform.

  • Entropy production and mixed convection within trapezoidal cavity having nanofluids and localised Solid Cylinder
    'Springer Science and Business Media LLC', 2021
    Co-Authors: Muhamad S. Ishak, Ammar I. Alsabery, Ishak Hashim, Ali J. Chamkha
    Abstract:

    Abstract The entropy production and mixed convection within a trapezoidal nanofluid-filled cavity having a localised Solid Cylinder is numerically examined using the finite element technique. The top horizontal surface moving at a uniform velocity is kept at a cold temperature, while the bottom horizontal surface is thermally activated. The remaining surfaces are maintained adiabatic. Water-based nanofluids ( $$\text {Al}_2\text {O}_3$$ Al 2 O 3 nanoparticles) are used in this study, and the Boussinesq approximation applies. The influence of the Reynolds number, Richardson number, nanoparticles volume fraction, dimensionless radius and location of the Solid Cylinder on the streamlines, isotherms and isentropic are examined. The results show that the Solid Cylinder’s size and location are significant control parameters for optimising the heat transfer and the Bejan number inside the trapezoidal cavity. Furthermore, the maximum average Nusselt numbers are obtained for high R values, where the average Nusselt number is increased by 30% when R is raised from 0 to 0.25

  • magnetohydrodynamics energy transport inside a double lid driven wavy walled chamber impacts of inner Solid Cylinder and two phase nanoliquid approach
    International Journal of Mechanical Sciences, 2020
    Co-Authors: Ammar I. Alsabery, Ali J. Chamkha, Mikhail A Sheremet, M Sheikholeslami, Ishak Hashim
    Abstract:

    Abstract Control of energy transport and convective liquid circulation is a challenge in various engineering devices. Solution to this major problem can be obtained by different techniques such as magnetic field impact, irregular shape of the walls, internal Solid obstacles, nanoliquids, moving walls and so on. The current study is devoted to a numerical analysis of nanoliquid mixed convective circulation and thermal transmission within a lid-driven wavy chamber with a central Solid Cylinder in the presence of a uniform magnetic influence, Brownian diffusion of nanoparticles and thermophoresis effects. The governing equations are formulated by employing the conservation laws in dimensionless form and the results are calculated by the finite-element method. Validations with experimental/numerical data are accomplished which lend confidence in the numerical data of the existing code. Analysis of the nanoliquid circulation and energy transport is conducted for a wide range of control parameters. It has been revealed that the augmentation of nano-sized particles enhances the overall energy transport in the case of low Reynolds number.

  • energy transport of two phase nanofluid approach inside a three dimensional lid driven cubic cavity containing Solid Cylinder and heat source
    Chemical Engineering and Processing, 2020
    Co-Authors: Ammar I. Alsabery, Ali J. Chamkha, Mikhail A Sheremet, Ishak Hashim
    Abstract:

    Abstract The energy transport intensification can be achieved by an addition of nanoparticles to the host liquid. Simultaneously, a location of partial heating and the velocity of moving cavity surface can be control parameters for the thermal transmission. The present research deals with a computational investigation of mixed convective energy transport within a cubical chamber saturated by nanofluids, including the impacts of cold surface motion, local heating, and central heat-conducting Cylinder. The governing equations are written using the Buongiorno's nanoliquid approach with the Boussinesq approximation in primitive dimensionless variables and are solved numerically by the finite-element technique. An investigation of the nanoliquid circulation and energy transport has resulted in an extensive range of control characteristics, namely, Reynolds number, Richardson number, nanoparticle volume fraction, dimensionless radius of Solid Cylinder, dimensionless heat source length and the dimensionless heat source position. It has been observed that a nonlinear impact of nanoparticles volume fraction toward the energy transport strength for high Reynolds number exists. Whilst for low Reynolds number, a growth of the nano-sized particles concentration leads to the energy transference strengthening. At the same time, a rise of the inner Cylinder size characterizes a diminution of the heat transport strength.

  • fluid structure interaction analysis of transient convection heat transfer in a cavity containing inner Solid Cylinder and flexible right wall
    International Journal of Numerical Methods for Heat & Fluid Flow, 2019
    Co-Authors: Ammar I. Alsabery, Ali J. Chamkha, Habibis Saleh, Mohammad Ghalambaz, Ishak Hashim
    Abstract:

    This paper aims to investigate the fluid structure interaction analysis of conjugate natural convection in a square containing internal Solid Cylinder and flexible right wall.,The right wall of the cavity is flexible, which can be deformed due to the interaction with the natural convection flow in the cavity. The top and bottom walls of the cavity are insulated while the right wall is cold and the left wall is partially heated. The governing equations for heat, flow and elastic wall, as well as the grid deformation are written in Arbitrary Lagrangian–Eulerian formulation. The governing equations along with their boundary conditions are solved using the finite element method.,The results of the present study show that the presence of the Solid Cylinder strongly affects the transient solution at the initial times. The natural convection flow changes the shape of the flexible right wall of the cavity into S shape wall due to the interaction of the flow and the structure. It is found that the increase of the flexibility of the right wall increases the average Nusselt number of the hot wall up to 2 per cent.,To the best of the authors' knowledge, the unsteady natural convection in an enclosure having a flexible wall and inner Solid Cylinder has never been reported before.

  • effect of local thermal non equilibrium model on natural convection in a nanofluid filled wavy walled porous cavity containing inner Solid Cylinder
    Chemical Engineering Science, 2019
    Co-Authors: Ammar I. Alsabery, Ali J. Chamkha, Rasul Mohebbi, Ishak Hashim
    Abstract:

    Abstract In the current work, the impacts of local thermal non-equilibrium model and Al 2 O 3 -water nanofluid on natural convection heat transfer in a porous cavity consisting of a bottom heated wavy wall and an inner Solid Cylinder are investigated. The Galerkin weighted residual finite element method is utilized to simulate the dimensionless governing equations of the fluid flow and heat transfer. The effects of different parameters including Darcy number ( 10 - 6 ⩽ Da ⩽ 10 - 2 ), nanoparticle volume fraction ( 0 ⩽ ϕ ≤ 0.04 ), modified conductivity ratio ( 0.01 ⩽ γ ≤ 1000 ), number of undulations ( 1 ⩽ N ⩽ 4 ) and the porosity of the medium ( 0.2 ⩽ e ⩽ 0.8 ) on the field of the flow and the heat transfer mechanisms are described. The Forchheimer-Brinkman-extended Darcy model along with the Boussinesq approximation are assumed to hold. A comprehensive validation of the present code is obtained by comparing the results with those of previous studies. The results show that all the mentioned parameters have significant impacts on the fluid flow and the temperature distributions. In addition, increasing the thermal conductivity of the nanoparticles leads to an increase in the rate of heat transfer for the nanofluid condition and reaches its maximum value at ϕ = 0.04 . Considering high values of e , the average Nusselt number increases by the augmentation of ϕ , while at low values of the porosity, the average Nusselt number decreases after reaching a peak. The results of this study are very useful for designing a porous heat exchanger.

Ishak Hashim - One of the best experts on this subject based on the ideXlab platform.

  • Entropy production and mixed convection within trapezoidal cavity having nanofluids and localised Solid Cylinder
    'Springer Science and Business Media LLC', 2021
    Co-Authors: Muhamad S. Ishak, Ammar I. Alsabery, Ishak Hashim, Ali J. Chamkha
    Abstract:

    Abstract The entropy production and mixed convection within a trapezoidal nanofluid-filled cavity having a localised Solid Cylinder is numerically examined using the finite element technique. The top horizontal surface moving at a uniform velocity is kept at a cold temperature, while the bottom horizontal surface is thermally activated. The remaining surfaces are maintained adiabatic. Water-based nanofluids ( $$\text {Al}_2\text {O}_3$$ Al 2 O 3 nanoparticles) are used in this study, and the Boussinesq approximation applies. The influence of the Reynolds number, Richardson number, nanoparticles volume fraction, dimensionless radius and location of the Solid Cylinder on the streamlines, isotherms and isentropic are examined. The results show that the Solid Cylinder’s size and location are significant control parameters for optimising the heat transfer and the Bejan number inside the trapezoidal cavity. Furthermore, the maximum average Nusselt numbers are obtained for high R values, where the average Nusselt number is increased by 30% when R is raised from 0 to 0.25

  • magnetohydrodynamics energy transport inside a double lid driven wavy walled chamber impacts of inner Solid Cylinder and two phase nanoliquid approach
    International Journal of Mechanical Sciences, 2020
    Co-Authors: Ammar I. Alsabery, Ali J. Chamkha, Mikhail A Sheremet, M Sheikholeslami, Ishak Hashim
    Abstract:

    Abstract Control of energy transport and convective liquid circulation is a challenge in various engineering devices. Solution to this major problem can be obtained by different techniques such as magnetic field impact, irregular shape of the walls, internal Solid obstacles, nanoliquids, moving walls and so on. The current study is devoted to a numerical analysis of nanoliquid mixed convective circulation and thermal transmission within a lid-driven wavy chamber with a central Solid Cylinder in the presence of a uniform magnetic influence, Brownian diffusion of nanoparticles and thermophoresis effects. The governing equations are formulated by employing the conservation laws in dimensionless form and the results are calculated by the finite-element method. Validations with experimental/numerical data are accomplished which lend confidence in the numerical data of the existing code. Analysis of the nanoliquid circulation and energy transport is conducted for a wide range of control parameters. It has been revealed that the augmentation of nano-sized particles enhances the overall energy transport in the case of low Reynolds number.

  • energy transport of two phase nanofluid approach inside a three dimensional lid driven cubic cavity containing Solid Cylinder and heat source
    Chemical Engineering and Processing, 2020
    Co-Authors: Ammar I. Alsabery, Ali J. Chamkha, Mikhail A Sheremet, Ishak Hashim
    Abstract:

    Abstract The energy transport intensification can be achieved by an addition of nanoparticles to the host liquid. Simultaneously, a location of partial heating and the velocity of moving cavity surface can be control parameters for the thermal transmission. The present research deals with a computational investigation of mixed convective energy transport within a cubical chamber saturated by nanofluids, including the impacts of cold surface motion, local heating, and central heat-conducting Cylinder. The governing equations are written using the Buongiorno's nanoliquid approach with the Boussinesq approximation in primitive dimensionless variables and are solved numerically by the finite-element technique. An investigation of the nanoliquid circulation and energy transport has resulted in an extensive range of control characteristics, namely, Reynolds number, Richardson number, nanoparticle volume fraction, dimensionless radius of Solid Cylinder, dimensionless heat source length and the dimensionless heat source position. It has been observed that a nonlinear impact of nanoparticles volume fraction toward the energy transport strength for high Reynolds number exists. Whilst for low Reynolds number, a growth of the nano-sized particles concentration leads to the energy transference strengthening. At the same time, a rise of the inner Cylinder size characterizes a diminution of the heat transport strength.

  • fluid structure interaction analysis of transient convection heat transfer in a cavity containing inner Solid Cylinder and flexible right wall
    International Journal of Numerical Methods for Heat & Fluid Flow, 2019
    Co-Authors: Ammar I. Alsabery, Ali J. Chamkha, Habibis Saleh, Mohammad Ghalambaz, Ishak Hashim
    Abstract:

    This paper aims to investigate the fluid structure interaction analysis of conjugate natural convection in a square containing internal Solid Cylinder and flexible right wall.,The right wall of the cavity is flexible, which can be deformed due to the interaction with the natural convection flow in the cavity. The top and bottom walls of the cavity are insulated while the right wall is cold and the left wall is partially heated. The governing equations for heat, flow and elastic wall, as well as the grid deformation are written in Arbitrary Lagrangian–Eulerian formulation. The governing equations along with their boundary conditions are solved using the finite element method.,The results of the present study show that the presence of the Solid Cylinder strongly affects the transient solution at the initial times. The natural convection flow changes the shape of the flexible right wall of the cavity into S shape wall due to the interaction of the flow and the structure. It is found that the increase of the flexibility of the right wall increases the average Nusselt number of the hot wall up to 2 per cent.,To the best of the authors' knowledge, the unsteady natural convection in an enclosure having a flexible wall and inner Solid Cylinder has never been reported before.

  • effect of local thermal non equilibrium model on natural convection in a nanofluid filled wavy walled porous cavity containing inner Solid Cylinder
    Chemical Engineering Science, 2019
    Co-Authors: Ammar I. Alsabery, Ali J. Chamkha, Rasul Mohebbi, Ishak Hashim
    Abstract:

    Abstract In the current work, the impacts of local thermal non-equilibrium model and Al 2 O 3 -water nanofluid on natural convection heat transfer in a porous cavity consisting of a bottom heated wavy wall and an inner Solid Cylinder are investigated. The Galerkin weighted residual finite element method is utilized to simulate the dimensionless governing equations of the fluid flow and heat transfer. The effects of different parameters including Darcy number ( 10 - 6 ⩽ Da ⩽ 10 - 2 ), nanoparticle volume fraction ( 0 ⩽ ϕ ≤ 0.04 ), modified conductivity ratio ( 0.01 ⩽ γ ≤ 1000 ), number of undulations ( 1 ⩽ N ⩽ 4 ) and the porosity of the medium ( 0.2 ⩽ e ⩽ 0.8 ) on the field of the flow and the heat transfer mechanisms are described. The Forchheimer-Brinkman-extended Darcy model along with the Boussinesq approximation are assumed to hold. A comprehensive validation of the present code is obtained by comparing the results with those of previous studies. The results show that all the mentioned parameters have significant impacts on the fluid flow and the temperature distributions. In addition, increasing the thermal conductivity of the nanoparticles leads to an increase in the rate of heat transfer for the nanofluid condition and reaches its maximum value at ϕ = 0.04 . Considering high values of e , the average Nusselt number increases by the augmentation of ϕ , while at low values of the porosity, the average Nusselt number decreases after reaching a peak. The results of this study are very useful for designing a porous heat exchanger.

Ali J. Chamkha - One of the best experts on this subject based on the ideXlab platform.

  • mhd natural convection of a cnt based nanofluid filled annular circular enclosure with inner heat generating Solid Cylinder
    European Physical Journal Plus, 2021
    Co-Authors: Tahar Tayebi, Hakan F Oztop, Ali J. Chamkha
    Abstract:

    The present work is dedicated to understanding the natural convective flow mechanism and heat exchange under magnetic field within a concentric circular annulus between a heat-generating conductive internal Cylinder and an isothermally cold external Cylinder filled with a CNTs-water-based nanoliquid. The free convective flow is generated by the temperature gradient created between the inner heat-generating Solid Cylinder and the outer cold Cylinder. The flow equations in their dimensionless form are numerically solved via the technique of finite volume. The dependency of various factors and their interrelationships affecting the thermo-hydrodynamic behavior and heat exchange rate within the system has been delineated. The findings of this study emphasize the role of the considered control parameters with regards to the hydro-thermal characteristics and the heat exchange rate within the annulus.

  • Entropy production and mixed convection within trapezoidal cavity having nanofluids and localised Solid Cylinder
    'Springer Science and Business Media LLC', 2021
    Co-Authors: Muhamad S. Ishak, Ammar I. Alsabery, Ishak Hashim, Ali J. Chamkha
    Abstract:

    Abstract The entropy production and mixed convection within a trapezoidal nanofluid-filled cavity having a localised Solid Cylinder is numerically examined using the finite element technique. The top horizontal surface moving at a uniform velocity is kept at a cold temperature, while the bottom horizontal surface is thermally activated. The remaining surfaces are maintained adiabatic. Water-based nanofluids ( $$\text {Al}_2\text {O}_3$$ Al 2 O 3 nanoparticles) are used in this study, and the Boussinesq approximation applies. The influence of the Reynolds number, Richardson number, nanoparticles volume fraction, dimensionless radius and location of the Solid Cylinder on the streamlines, isotherms and isentropic are examined. The results show that the Solid Cylinder’s size and location are significant control parameters for optimising the heat transfer and the Bejan number inside the trapezoidal cavity. Furthermore, the maximum average Nusselt numbers are obtained for high R values, where the average Nusselt number is increased by 30% when R is raised from 0 to 0.25

  • magnetohydrodynamics energy transport inside a double lid driven wavy walled chamber impacts of inner Solid Cylinder and two phase nanoliquid approach
    International Journal of Mechanical Sciences, 2020
    Co-Authors: Ammar I. Alsabery, Ali J. Chamkha, Mikhail A Sheremet, M Sheikholeslami, Ishak Hashim
    Abstract:

    Abstract Control of energy transport and convective liquid circulation is a challenge in various engineering devices. Solution to this major problem can be obtained by different techniques such as magnetic field impact, irregular shape of the walls, internal Solid obstacles, nanoliquids, moving walls and so on. The current study is devoted to a numerical analysis of nanoliquid mixed convective circulation and thermal transmission within a lid-driven wavy chamber with a central Solid Cylinder in the presence of a uniform magnetic influence, Brownian diffusion of nanoparticles and thermophoresis effects. The governing equations are formulated by employing the conservation laws in dimensionless form and the results are calculated by the finite-element method. Validations with experimental/numerical data are accomplished which lend confidence in the numerical data of the existing code. Analysis of the nanoliquid circulation and energy transport is conducted for a wide range of control parameters. It has been revealed that the augmentation of nano-sized particles enhances the overall energy transport in the case of low Reynolds number.

  • energy transport of two phase nanofluid approach inside a three dimensional lid driven cubic cavity containing Solid Cylinder and heat source
    Chemical Engineering and Processing, 2020
    Co-Authors: Ammar I. Alsabery, Ali J. Chamkha, Mikhail A Sheremet, Ishak Hashim
    Abstract:

    Abstract The energy transport intensification can be achieved by an addition of nanoparticles to the host liquid. Simultaneously, a location of partial heating and the velocity of moving cavity surface can be control parameters for the thermal transmission. The present research deals with a computational investigation of mixed convective energy transport within a cubical chamber saturated by nanofluids, including the impacts of cold surface motion, local heating, and central heat-conducting Cylinder. The governing equations are written using the Buongiorno's nanoliquid approach with the Boussinesq approximation in primitive dimensionless variables and are solved numerically by the finite-element technique. An investigation of the nanoliquid circulation and energy transport has resulted in an extensive range of control characteristics, namely, Reynolds number, Richardson number, nanoparticle volume fraction, dimensionless radius of Solid Cylinder, dimensionless heat source length and the dimensionless heat source position. It has been observed that a nonlinear impact of nanoparticles volume fraction toward the energy transport strength for high Reynolds number exists. Whilst for low Reynolds number, a growth of the nano-sized particles concentration leads to the energy transference strengthening. At the same time, a rise of the inner Cylinder size characterizes a diminution of the heat transport strength.

  • fluid structure interaction analysis of transient convection heat transfer in a cavity containing inner Solid Cylinder and flexible right wall
    International Journal of Numerical Methods for Heat & Fluid Flow, 2019
    Co-Authors: Ammar I. Alsabery, Ali J. Chamkha, Habibis Saleh, Mohammad Ghalambaz, Ishak Hashim
    Abstract:

    This paper aims to investigate the fluid structure interaction analysis of conjugate natural convection in a square containing internal Solid Cylinder and flexible right wall.,The right wall of the cavity is flexible, which can be deformed due to the interaction with the natural convection flow in the cavity. The top and bottom walls of the cavity are insulated while the right wall is cold and the left wall is partially heated. The governing equations for heat, flow and elastic wall, as well as the grid deformation are written in Arbitrary Lagrangian–Eulerian formulation. The governing equations along with their boundary conditions are solved using the finite element method.,The results of the present study show that the presence of the Solid Cylinder strongly affects the transient solution at the initial times. The natural convection flow changes the shape of the flexible right wall of the cavity into S shape wall due to the interaction of the flow and the structure. It is found that the increase of the flexibility of the right wall increases the average Nusselt number of the hot wall up to 2 per cent.,To the best of the authors' knowledge, the unsteady natural convection in an enclosure having a flexible wall and inner Solid Cylinder has never been reported before.

P Ponnusamy - One of the best experts on this subject based on the ideXlab platform.

  • wave propagation in a generalized thermoelastic Solid Cylinder of arbitrary cross section
    International Journal of Solids and Structures, 2007
    Co-Authors: P Ponnusamy
    Abstract:

    Abstract In this article, the wave propagation in a generalized thermoelastic Solid Cylinder of arbitrary cross-section is discussed, using the Fourier expansion collocation method. The Solid medium is assumed to be linear, isotropic, and dependent on the rate of temperature. Three displacement potential functions are introduced, to uncouple the equations of motion and the heat conduction. By imposing the continuity conditions the frequency equation corresponding to the problem is obtained using the Fourier expansion collocation method based on Suhubi’s generalized theory [Suhubi, E.S., 1975. Thermoelastic Solids. In: Eringen, A.C. (Ed.), Continuum Physics, vol. 2. Academic, New York, Chapter 2]. To compare the model with the existing literature, the results of a generalized thermoelastic Solid Cylinder are obtained and they are compared with the results of Erbay and Suhubi [Erbay, E.S., Suhubi, E.S., 1986. Longitudinal wavepropagationed thermoelastic Cylinder. J. Thermal Stresses 9, 279–295]. It shows very good degree of agreement. The computed non-dimensional wavenumbers are presented in figures for various values of the material parameters. The general theory can be used to study any kind of Cylinders with proper geometrical relations.

  • wave propagation in a generalized thermoelastic Solid Cylinder of arbitrary cross section immersed in a fluid
    International Journal of Mechanical Sciences, 2007
    Co-Authors: M Venkatesan, P Ponnusamy
    Abstract:

    The wave propagation in a generalized thermoelastic Solid Cylinder of arbitrary cross-section immersed in a fluid is discussed in this paper. The Solid medium is assumed to be linear, isotropic, temperature rate-dependent thermoelastic and the fluid medium is assumed to be inviscid. By imposing the continuity conditions on the interface between Solid and fluid mediums, the frequency equation corresponding to the problem is obtained using the Fourier expansion collocation method. To compare the model with the existing literature, the results of a generalized thermoelastic Solid Cylinder without fluid are obtained and they show very good agreement. Also graphs and tables for various values of the material parameters are furnished.

Jan Fransaer - One of the best experts on this subject based on the ideXlab platform.

  • thermocapillary motion of a Solid Cylinder near a liquid gas interface
    Physics of Fluids, 2020
    Co-Authors: A Arslanova, Giovanniantonio Natale, Naveen Krishna Reddy, Christian Clasen, Jan Fransaer
    Abstract:

    The motion of a Solid, infinitely long Cylinder perpendicular to a convective liquid–gas interface due to thermocapillarity is investigated via an analytical model. If the Cylinder temperature differs from the bulk temperature, a temperature gradient exists along the liquid–gas interface. This results in surface tension gradients at the liquid–gas interface, causing fluid flow around the particle, which induces propulsion. For small particles and, thus, small Peclet and Reynolds numbers, the steady-state equations for temperature and flow fields are solved exactly using two-dimensional bipolar cylindrical coordinates. The velocity of the Cylinder as a function of separation distance from the liquid–gas interface is determined for the case of a constant temperature or a constant heat flux on the surface of the Cylinder. A larger temperature gradient at the liquid–gas interface in the latter system leads to a larger Cylinder velocity and a higher propulsion efficiency. The thermocapillary effect results in larger force on a Cylinder than forces arising from other self-propulsion mechanisms.