The Experts below are selected from a list of 180 Experts worldwide ranked by ideXlab platform
Rafael Cortell - One of the best experts on this subject based on the ideXlab platform.
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mhd flow and mass transfer of an electrically Conducting Fluid of second grade in a porous medium over a stretching sheet with chemically reactive species
Chemical Engineering and Processing, 2007Co-Authors: Rafael CortellAbstract:An analysis is carried out to study the flow, chemical reaction and mass transfer of a steady laminar boundary layer flow of an electrically Conducting Fluid of second grade in a porous medium subject to a transverse uniform magnetic field past a semi-infinite impermeable stretching sheet. The governing partial differential equations are converted into ordinary differential equations by a similarity transformation and an analytical solution for this flow is utilized, whereas the concentration profiles are obtained numerically for higher-order reactions. The variations of dimensionless surface concentration and dimensionless surface concentration gradient as well as mass transfer characteristics with various parameters are graphed and tabulated. Our numerical computations show that the effect of destructive chemical reaction is to diminish the concentration boundary layer. This phenomenon is quite the opposite when a generative reaction is present.
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flow and heat transfer of an electrically Conducting Fluid of second grade over a stretching sheet subject to suction and to a transverse magnetic field
International Journal of Heat and Mass Transfer, 2006Co-Authors: Rafael CortellAbstract:An analysis is performed for flow and heat transfer of a steady laminar boundary-layer flow of an electrically Conducting Fluid of second grade subject to suction and to a transverse uniform magnetic field past a semi-infinite stretching sheet. The governing partial differential equations are converted into ordinary differential equations by a similarity transformation and an analytical solution for this flow is utilized. The effects of viscous dissipation and work due to deformation are considered in the energy equation and the variations of dimensionless surface temperature and dimensionless surface temperature gradient with various parameters are graphed and tabulated. Two cases are studied, namely, (i) the sheet with constant surface temperature (CST case) and (ii) the sheet with prescribed surface temperature (PST case).
K Vajravelu - One of the best experts on this subject based on the ideXlab platform.
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convective heat transfer in a Conducting Fluid over a permeable stretching surface with suction and internal heat generation absorption
Applied Mathematics and Computation, 2011Co-Authors: Robert A Van Gorder, K VajraveluAbstract:Abstract We consider a convective flow in a porous medium of an incompressible viscous Conducting Fluid impinging on a permeable stretching surface with suction, and internal heat generation/absorption. Using a similarity transformation the governing equations of the problem are reduced to a coupled third-order nonlinear ordinary differential equations. We first examine a number of special cases for which we may obtain exact solutions. We then obtain analytical solutions (by the Homotopy Analysis Method) and numerical solutions (by a boundary value problem solver), in order to further study the behavior of the nonlinear differential equations, for various values of the physical parameters. Our numerical solutions are shown to agree with the available results in the literature. We then employ the numerical results to bring out the effects of the suction parameter, heat source/sink parameter, stretching parameter, porosity parameter, the Prandtl number and the free convection parameter on the flow and heat transfer characteristics. In the absence of suction and free convection, our findings are in agreement with the corresponding numerical results of Attia [H.A. Attia, On the effectiveness of porosity on stagnation point flow towards a stretching surface with heat generation, Comput. Mater. Sci. 38 (2007) 741–745].
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convective heat transfer in an electrically Conducting Fluid at a stretching surface with uniform free stream
International Journal of Engineering Science, 1997Co-Authors: K Vajravelu, A HadjinicolaouAbstract:Abstract An analysis is carried out to study the flow and heat transfer characteristics in an electrically Conducting Fluid near an isothermal sheet. The sheet is linearly stretched in the presence of a uniform free stream of constant velocity and temperature. The effects of free convection and internal heat generation or absorption are also considered. The resulting coupled nonlinear differential equations are integrated numerically and the flow and heat transfer characteristics are discussed. Although the velocity profiles are similar in the absence of free stream, it is shown that the differential system gives rise to nonsimilar velocity profiles in the boundary layer.
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heat transfer in an electrically Conducting Fluid over a stretching surface
International Journal of Non-linear Mechanics, 1992Co-Authors: K Vajravelu, David RollinsAbstract:Abstract An analysis is carried out to study the heat transfer characteristics in an electrically Conducting Fluid over a stretching sheet with variable wall temperature and internal heat generation or absorption. Two eases are studied, namely, (i) the sheet with prescribed surface temperature (PST case) and (ii) the sheet with prescribed wall heat flux (PHF case). The solutions for the temperature, the heat transfer characteristics and their asymptotic limits for large Prandtl number (σ) are obtained in terms of Kummer's and parabolic cylinder functions. It is shown that asymptotic limits are not possible for small Prandtl number; this is due to the solution changing by O(1) on length scale of 1/σ. For large Prandtl number, a boundary layer of width 1/σ at η = 0 and an internal layer of width ∝1/σ near the turning point are noticed.
R Shirsavar - One of the best experts on this subject based on the ideXlab platform.
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rotation induced by uniform and non uniform magnetic fields in a Conducting Fluid carrying an electric current
RSC Advances, 2016Co-Authors: Ali Nejati, R Shirsavar, Mojtaba Nasiri, Ahmad Amjadi, S O Sobhani, Mehdi HabibiAbstract:We study the dynamics of a Conducting Fluid carrying (i) a uniform current in the presence of a non-uniform magnetic field or (ii) carrying a non-uniform current in the presence of a uniform magnetic field, using particle image velocimetry (PIV). Our results show that the average angular velocity of the induced rotation has a power-law dependence on the electric current passing through the Fluid with an exponent ≈2/3, in excellent agreement with our simulation results, for the same system. To explain the experimental observations we explore all possibilities for inducing rotation in a Fluid carrying an electric current. Our theoretical discussion indicates two scenarios wherein applying electric/magnetic field on a current-carrying Fluid produces rotational vortices: (i) applying a non-uniform magnetic field in the presence of an electric current and, (ii) applying a magnetic field in the presence of a non-uniform electric current. These two theoretical scenarios for inducing rotation by applying external fields agree well with our experimental observations and simulation results.
Mehdi Habibi - One of the best experts on this subject based on the ideXlab platform.
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rotation induced by uniform and non uniform magnetic fields in a Conducting Fluid carrying an electric current
RSC Advances, 2016Co-Authors: Ali Nejati, R Shirsavar, Mojtaba Nasiri, Ahmad Amjadi, S O Sobhani, Mehdi HabibiAbstract:We study the dynamics of a Conducting Fluid carrying (i) a uniform current in the presence of a non-uniform magnetic field or (ii) carrying a non-uniform current in the presence of a uniform magnetic field, using particle image velocimetry (PIV). Our results show that the average angular velocity of the induced rotation has a power-law dependence on the electric current passing through the Fluid with an exponent ≈2/3, in excellent agreement with our simulation results, for the same system. To explain the experimental observations we explore all possibilities for inducing rotation in a Fluid carrying an electric current. Our theoretical discussion indicates two scenarios wherein applying electric/magnetic field on a current-carrying Fluid produces rotational vortices: (i) applying a non-uniform magnetic field in the presence of an electric current and, (ii) applying a magnetic field in the presence of a non-uniform electric current. These two theoretical scenarios for inducing rotation by applying external fields agree well with our experimental observations and simulation results.
David Rollins - One of the best experts on this subject based on the ideXlab platform.
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heat transfer in an electrically Conducting Fluid over a stretching surface
International Journal of Non-linear Mechanics, 1992Co-Authors: K Vajravelu, David RollinsAbstract:Abstract An analysis is carried out to study the heat transfer characteristics in an electrically Conducting Fluid over a stretching sheet with variable wall temperature and internal heat generation or absorption. Two eases are studied, namely, (i) the sheet with prescribed surface temperature (PST case) and (ii) the sheet with prescribed wall heat flux (PHF case). The solutions for the temperature, the heat transfer characteristics and their asymptotic limits for large Prandtl number (σ) are obtained in terms of Kummer's and parabolic cylinder functions. It is shown that asymptotic limits are not possible for small Prandtl number; this is due to the solution changing by O(1) on length scale of 1/σ. For large Prandtl number, a boundary layer of width 1/σ at η = 0 and an internal layer of width ∝1/σ near the turning point are noticed.