关键词: 传热, 多孔介质, 热弥散, 渗流

Abstract: A new model for thermal dispersion is proposed based on the character of flow in porous media, which relates the dispersion with the velocity and tortuosity of the fluid flow in pores. Compared with former similar ones, this model has fewer empirical parameters, and therefore it is expected to be used more widely and conveniently. The temperature distributions in the nearby wall region can be successfully reproduced by present model when a single – phase fluid flows through a packed channel. The predictions of Nu vs. Re agree with the experimental results well.

Key words: Heat transfer, Porous media, Seepage flow, Thermal dispersion