MIXED CONVECTION ABOUT A NONISOTHERMAL CYLINDER AND SPHERE IN A POROUS MEDIUM

Abstract

The problems of mixed convection about a nonisothermai horizontal cytiner and sphere embedded in a porous medium are analyzed based on a curvilinear orthogonal coordinate system together with boundary-layer simplifications. Different transformations were performed for the horizontal cylinder and the sphere, and the resulting equations are identical for the two geometries. Approximate solutions for the problems are obtained based on the nonlocal similarity method. Numerical computations for the temperature distribution and heat flux were carried out up to the third level of truncation. The effects of buoyancy and wall temperature variations on heat transfer characteristics about a heated horizontal cylinder and sphere in a porous medium are examined.