多孔介质内复合对流传热传质的数值分析

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

采用数值方法分析了具有非均匀内热源的竖直套管中复合对流传热传质,考查内热源分布系数M和热质二浮力比N对速度、温度、浓度分布以及Nusselt数和Sherwood数的影响。结果表明:当N>1时速度V为正,其值随N的增加而增大;当N<-1.5时,V则先负后正。随着M增大,等温线和等浓度线分布更加密集,传热和传质过程更加明显。

A numerical analysis was conducted for combined heat and mass transfer by natural convection in the vertical annulus filled with saturated porous medium with a non-uniform generation and the forced convection in the vertical annulus,with the increase of M,the velocity in the inner wall became fast,and reversed flow occurred near outer wall.Local friction coefficient of inner inclined to the same value,and this value decreased with M increasing.