Unsteady free-convective flow and mass transfer in a rotating porous medium with Hall current, I

1991 ◽  
Vol 181 (2) ◽  
pp. 171-181 ◽  
Author(s):  
T. P. Singh ◽  
A. K. Agrawal ◽  
H. L. Agrawal ◽  
A. Raptis
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Convective Flow ◽  
Hall Current ◽  
Free Convective Flow

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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