具有非均匀内热源的多孔介质中自然对流传热传质的数值研究

Numerical Analysis of Heat and Mass Transfer in Porous Media With a Non-uniform Heat Source

采用数值方法分析了具有非均匀分布内热源的竖直同心套管内多孔介质中的传热传质,内热源分布系数M较大时,造成流场中心的逆时针环流向中心挤压。浮力比N由1.5变为-1.5后,流体由顺时针流动变为逆时针流动且流体速度加快。Nusselt数在Z=0.7处出现转折。随M增大内壁面Nusselt数变化范围增大,并且转折点前移。上壁面Sherwood数也呈先增大后减小的趋势,并且在R=0.9处出现转折。

A numerical analysis is conducted for combined heat and mass transfer by natural convection in the vertical annulus filled with saturated porous medium with a non-uniform generation. With the buoyan- cy ratio N decrease from 1.5 to 1.5, the reverse circulations in the center of the velocity field expanded, as well outside Nusselt number and the Sherwood number increase with M.