Mixed convection boundary layer flow along a stretching cylinder in porous medium

Abstract

This paper presents an axi-symmetric laminar boundary layer mixed convection flow of a viscous incompressible fluid and heat transfer towards a stretching cylinder embedded in porous medium. Variable surface temperature is assumed. The partial differential equations corresponding to the momentum equations are converted into highly non-linear ordinary differential equations with the help of similarity transformations. Numerical solutions of these equations are obtained by shooting method. It is found that the velocity decreases but the temperature increases with increasing permeability parameter. With the increasing values of mixed convection parameter, velocity is found to increase for buoyancy aided flow but opposite nature is noted for buoyancy opposed flow. The skin friction as well as the heat transfer rate at the surface is larger for a cylinder compared to a flat plate. Thermal boundary layer thickness decreases with increasing Prandtl number.