Analysis of the Chimney Natural Convection in a Vertical Porous Cylinder

Abstract

The problem of natural convection in a vertical opened porous cylinder, with a constant wall temperature, has been investigated numerically. Two types of flows behavior, with and without fluid recirculation, have been considered. The conditions of getting one or the other flow depends on the filtration Rayleigh number (Ra), the aspect ratio (A), and the Biot number (Bi). The thermal field obtained depends mainly on the inlet–outlet conditions (Biot number) in the conductive regime. On the other hand, in the convective regime, the heat transfer is a weak function of the Biot number and the aspect ratio.