Soret and Dufour Effect on Unsteady Free Convective MHD Heat and Mass Transfer Flow with Variable Permeability, Heat Source and Thermal Diffusion

Abstract

The present paper deals with the study of unsteady two dimensional free convection with heat and mass transfer flow of an incompressible, viscous and electrically conducting fluid past a continuously moving infinite vertical plate under the influence of transverse magnetic field with variable permeability, heat source  and thermal diffusion.  The permeability of the porous medium fluctuates in time about a constant mean.  The free stream velocity of the fluid vibrates about a mean constant value and the surface absorbs the fluid with constant velocity.  Introducing the usual similarity transformations, the unsteady equations of momentum, energy and concentration are made similar.  To obtain local similarity solutions of the problem, the equations are solved analytically after applying perturbation technique. The velocity field, temperature field, concentration field and skin friction co-efficient are shown graphically to observe the effects of various parameters entering in the problem.  Finally a thorough discussion of different results are presented.