Hall Effects on Unsteady MHD Free Convection Flow over a Stretching Sheet with Variable Viscosity and Viscous Dissipation

2 Abstract: The unsteady magnetohydrodynamics free convection flow of an incompressible viscous fluid past a stretching surface is analyzed by taking into an account the variable viscosity and viscous dissipation under the influence of hall currents effect. The problem is governed by coupled nonlinear partial differential equations. The coupled non-linear ordinary differential equations have been solved numerically by the implicit finite difference method. The effect of magnetic parameter M, Hall parameter m, prandtl number Pr, Eckert number Ec, on velocity and temperature fields are investigated through graphs.