Heat and mass transfer in MHD flow of a viscous fluid past a vertical plate under oscillatory suction velocity

Hydromagnetic heat and mass transfer in MHD flow of an incompressible, electrically conducting, viscous fluid past an infinite vertical porous plate embedded with porous medium of time dependent permeability under oscillatory suction velocity normal to the plate is investigated. It is considered that the influence of the uniform magnetic field acts normal to the flow and the permeability of the porous medium fluctuates with time. Solutions for the velocity field, temperature distribution and concentration distribution are obtained using perturbation technique. Expressions for fluctuating parts of the velocity, amplitude of skin-friction, phase lead of skin-friction, shear stress, Nusselt number and Sherwood number are also obtained. The results obtained are discussed for Grashof number (G(r)>0) corresponding to the colling of the plate and (G(r)<0) corresponding to heating of the plate with the help of graphs and tables to observe the effects of various parameters encountered in the problem under investigation.