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A finite-difference analysis is performed to study the effects of thermal  radiation and chemical reaction on the transient MHD free convection and mass  transform flow of a dissipative fluid past an infinite vertical porous plate  subject to ramped wall temperature. The fluid considered here is a gray,  absorbing/emitting radiation but a non-scattering medium. The dimensionless  governing equations are unsteady, coupled and non-linear partial differential  equations. An analytical method fails to give a solution. Hence an implicit  finite difference scheme of Crank-Nicolson method is employed. The effect of  the Magnetic parameter (M), Chemical reaction parameter (K), Radiation  parameter (F), Buoyancy ratio parameter (N), Schmidt number (Sc) on the  velocity field and skin friction for both air (Pr=0.71) and water(Pr=7) in  the presence of both aiding (N>0) and opposing (N<0) flows are extensively  discussed with the help of graphs.

chemical industry and chemical engineering quarterly

Chemical reaction and radiation effects on the transient MHD free convection flow of dissipative fluid past an infinite vertical porous plate with ramped wall temperature