MIXED CONVECTION IN AN AXISYMMETRICAL STAGNATION FLOW OF MICROPOLAR FLUID ON A VERTICAL CYLINDER

An analysis is presented to study the effects of buoyancy on forced co nvection in an axisymmetric stagnation flow of micropolar fluids over a vertical cylinder with arbitrary temperature variations. Numerical s olutions are given for the governing momentum, angular momentum, and e nergy equations. Two flow regions, namely the buoyancy assisted and bu oyancy opposed cases, are analyzed. It is observed that the wall shear stress and surface heat transfer rate increase or decrease with the b uoyancy force parameter depending upon which flow regime is being cons idered. The effect of Prandtl number on the flow field in both the now regimes is discussed.