Effects of thermal radiation and magnetic field on unsteady mixed convection flow and heat transfer over a porous stretching surface in the presence of internal heat generation/absorption

Abstract

The problem of magneto-hydrodynamic unsteady mixed convective flow and heat transfer of an electrically conducting fluid over a porous stretching surface in the presence of heat generation/absorption and thermal radiation has been investigated. It is assumed that the unsteadiness is caused by the impulsive motion of the free stream velocity and by sudden increase in the surface temperature. The nonlinear partial differential equations of continuity, momentum, and energy are reduced to nonlinear ordinary differential equations .Numerical solutions of these equations are obtained with the help of shooting method. A comparison with available data from the open literature as well as the exact solution for the steady-state case of the present problem is made, and found to be in good agreement. Key words: Unsteady stretching surface, mixed convection, magnetic field, thermal radiation, internal heat generation or absorption.