【摘要】 单相流体流过饱和多孔介质的流动与换热姜培学，王补宣，罗棣庵，王湛（清华大学热能工程系北京１０００８４）关键词多孔介质，阻力系数，换热、热弥散１引占多孔介质中的流动和换热传质过程，不仅广泛存在于自然界中，而已具有非常广泛的实际应用背景。因此，多孔介质换...更多还原

【Abstract】 A numerical study of single phase fluid flow and convective heat transfer in a vertical saturated porous annulus is presented ill this paper. Comparison of numerical simulation results and experimental data from other references shows that the numerical results including thermal dispersion and the wall effect agree well with the experimental data. The effects of the inertial term, thermal dispersion, variable properties, buoyancy, and particle diameter on the flow and heat transfer were then studied. It was found that for the conditions studied. the effect of thermal dispersion and variable porosity had to be considered. For Re.≥ 5, theflow inertia had nonnegligible influence on the flow field and local heat transfer coefficientnear the inlet (x/(r2 - r1 ) < 1). When Re.≥ 400, the flow inertia significantly influenced theoverall friction factor in the vertical porous annulus. The porous medium greatly enhanced the heat transfer coefficient while also sharply increasing the friction resistance.更多还原