Radiation effects on unsteady MHD free convection with hall current near on an infinite vertical porous plate

Radiation effect on unsteady free convection flow of an electrically conducting gray gas near equilibrium in the optically thin limit along an infinite vertical porous plate are investigated in the presence of strong transverse magnetic field imposed perpendicularly to the plate, taking Hall currents into account. A similarly parameter length scale (h), as function of time and the suction velocity are considered to be inversely proportional to this parameter. Similarly equations are then derived and solved numerically using Galerkin finite element method. The numerical values of skin friction and the rate of heat transfer are represented in a table. The effects of radiation parameter, Hall parameter and the magnetic field parameters are discussed and shown graphically. (author)