• UNSTEADY FREE CONVECTIVE MHD FLOW IN A ROTATING SYSTEM THROUGH POROUS MEDIUM WITH RADIATION

C. S. Sravanthi*, A. Leela Ratnam, N. Bhaskar Reddy

Abstract


The aim of this paper is to investigate the radiation effect on an unsteady MHD free convective heat and mass transfer flow of a viscous incompressible fluid through a porous medium, bounded by an infinite vertical porous surface, in a rotating system under the action of uniform magnetic field applied normal to the direction of flow in an optically thin environment. It is assumed that the porous surface is rotating with a constant angular velocity and the porous vertical surface is subjected to a uniform constant suction velocity. The temperature at this vertical surface is assumed to fluctuate in time about a non-zero constant mean. Analytical expressions for the velocity, temperature and concentration fields are obtained using the perturbation technique and influences of various thermo physical parameters are discussed and shown graphically. It is observed that the primary velocity component decreases with an increase in  the radiation parameter R or  rotation parameter E or  permeability parameter Ko or Hartmann number M. It is also observed that the magnitude of the secondary velocity profiles increases when there is an increase in Radiation parameter R. It is also noted that the primary skin friction and the magnitude of the secondary skin friction component decreases due to an increase in radiation parameter R for the case of both water (Pr=7.0) or air (Pr=0.71).


Keywords


Magneto hydrodynamics, heat and mass transfer, perturbation technique, free convection, porous medium, rotation, primary and secondary velocity components, radiation.

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