The effect of an axial magnetic field on the flow and heat transfer about a fluid underlying the axisymmetric spreading surface with temperature dependent viscosity and thermal diffusivity

In this article, we studied the effects of variable viscosity and variable thermal diffusivity on heat transfer about a fluid underlying the axisymmetric spreading surface, taking into account the effect of an axial magnetic field. The governing fundamental equations are approximated by a system of nonlinear ordinary differential equations and are solved numerically by using shooting method. Numerical solutions are obtained for different values of variable viscosity, variable thermal diffusivity and the surface temperature variation parameter. The numerical results show that, variable viscosity, variable thermal diffusivity and the surface temperature variation parameter have significant influences on the velocity and temperature profiles, shear stress, couple stress and Nusselt number.