مشخصات پژوهش

The present study deals with the fluid flow and heat transfer in a pipe partially filled with porous media at a high Reynolds number. In addition to turbulence effects in this situation, interstitial fluid mixing within the pores plays an important role, causing significant thermal dispersion. The aim of the present study is to evaluate and compare the effects of these phenomena on the heat transfer rate in a pipe partially filled with porous media at the core and over the wall. The parameters studied are Darcy number, solid/ fluid conductivity ratio, Reynolds number, Prandtl number, and porous layer thickness. The results showed that dispersion effects increase with the increase of Darcy number, porous layer thickness, and Prandtl number. A similar trend is also observed for the variation of turbulence effects with these parameters except for Darcy number. It was also found that the heat transfer rate in a pipe partially filled with a porous layer over the wall is mainly affected by thermal dispersion and turbulence effects inside the porous media, while the Nusselt number is not affected by these phenomena when the porous media is inserted at the core.