Effects of mass transfer on steady hydromagnetic free convective flow of an incompressible viscous fluid past an infinite vertical porous wall

1979 ◽  
Vol 46 (4) ◽  
pp. 319-331
Author(s):  
G. A. Georgantopoulos
Keyword(s):  
Mass Transfer ◽  
Viscous Fluid ◽  
Convective Flow ◽  
Porous Wall ◽  
Incompressible Viscous Fluid ◽  
Free Convective Flow

The effect of radiation on free convective flow and mass transfer past a vertical isothermal cone surface with chemical reaction in the presence of a transverse magnetic field

2004 ◽  
Vol 82 (6) ◽  
pp. 447-458 ◽  
Author(s):  
A A Afify
Keyword(s):  
Magnetic Field ◽  
Mass Transfer ◽  
Boundary Conditions ◽  
Chemical Reaction ◽  
Transverse Magnetic Field ◽  
Convective Flow ◽  
Transverse Magnetic ◽  
Skin Friction Coefficient ◽  
Free Convective Flow ◽  
Cone Surface

The effects of radiation and chemical reactions, in the presence of a transverse magnetic field, on free convective flow and mass transfer of an optically dense viscous, incompressible, and electrically conducting fluid past a vertical isothermal cone surface are investigated. The nonlinear boundary-layer equations with the boundary conditions are transferred by a similarity transformation into a system of nonlinear ordinary differential equations with the appropriate boundary conditions. Furthermore, the similarity equations are solved numerically by using a fourth-order Runge–Kutta scheme with the shooting method. Numerical results for the skin-friction coefficient, the local Nusselt number, the local Sherwood number are given; as well, the velocity, temperature, and concentration profiles are presented for a Prandtl number of 0.7, the chemical-reaction parameter, the order of the reaction, the radiation parameter, the Schmidt number, the magnetic parameter, and the surface temperature parameter. PACS No.: 47.70.Fw

scholarly journals Chemical reaction effects on unsteady MHD free convective flow in a rotating porous medium with mass transfer

2014 ◽  
Vol 18 (suppl.2) ◽  
pp. 515-526 ◽  
Author(s):  
Arunachalam Govindarajan ◽  
Ali Chamkha ◽  
Sundarammal Kesavan ◽  
Mohanakrishnan Vidhya
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Convective Flow ◽  
Hartmann Number ◽  
Plane Surface ◽  
Perturbation Technique ◽  
Rotation Parameter ◽  
Free Convective Flow ◽  
Grashof Number ◽  
Permeability Parameter

An investigation of unsteady MHD free convective flow and mass transfer during the motion of a viscous incompressible fluid through a porous medium, bounded by an infinite vertical porous surface, in a rotating system is presented. The porous plane surface and the porous medium are assumed to rotate in a solid body rotation. The vertical surface is subjected to uniform constant suction perpendicular to it and the temperature at this surface fluctuates in time about a non-zero constant mean. Analytical expressions for the velocity, temperature and concentration fields are obtained using the perturbation technique. The effects of R (rotation parameter), k0 (permeability parameter), M (Hartmann number) and w (frequency parameter) on the flow characteristics are discussed. It is observed that the primary velocity component decreases with the increase in either of the rotation parameter R, the permeability parameter k0, or the Hartmann number M. It is also noted that the primary skin friction increases whenever there is an increase in the Grashof number Gr or the modified Grashof number Gm. It is clear that the heat transfer coefficient in terms of the Nusselt number decreases in the case of both air and water when there is an increase in the Hartmann number M. It is observed that the magnitude of the secondary velocity profiles increases whenever there is an increase in either of the Grashof number or the modified Grashof number for mass transfer or the permeability of the porous media. Concentration profiles decreases with an increase in the Schmidt number.

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