EFFECT OF PERMEABILITYAND HEAT GENERATION IN MHD FLOW ALONG A VERTICAL ISOTHERMAL POROUS PLATE UNDER VARIABLE ELECTRICAL CONDUCTIVITY.

MHD convective flow of a viscous incompressible fluid along a vertical isothermal porous plate is discussed with the action of variable electrical conductivity and heat generation in presence of external transverse magnetic field. It is supposed that there is an internal heat generation along the plate that decays exponentially while electrical conductivity of the fluid is a function of fluid temperature. The process of similarity transformation is used to transform the partial governing equations into ordinary. Considering fluid flow of low PrandltNumber Pr<< 1}, Numerical solutions and results are obtained for the fluid Prandlt Number = 0.025 ( mercury 200 c ) and 1.0 ( electrolytic solution ) using Runge-Kutta method, while Shooting method is used to find the missing initial conditions. The results are used to plot velocity and temperature profiles near the plate and skin-friction and heat transfer at the plate for various values of physical parameters used. The results show significant effects of fluid electrical conductivity and medium porosity on the flow and heat transfer in presence and absence of heat generation under the action of transverse magnetic field.