Unsteady mixed convection boundary layer flow past a sphere in a micropolar fluid

The unsteady mixed convection flow over a sphere in a micropolar fluid is studied. The unsteadiness is due to an impulsive motion of the free stream. The governing boundary layer equations are first reduced into a non-dimensional form. The nondimensional equations are transformed into a set of non-similarity boundary layer equations. The solutions are obtained numerically using an efficient implicit finite-difference method known as the Keller-Box method. The algorithm for 3D Keller-Box method has been developed. The numerical results obtained are presented through tables and graphs. The results show that the parameters such as material, microrotation and mixed convection parameters for assisting and opposing cases have strong influence on the fluid motion.