压缩性和稀薄性对微通道气体流动换热的影响

EFFECTS OF COMPRESSIBILITY AND RAREFACTION ON GASEOUS FLOW AND HEAT TRANSFER IN MICRO-CHANNELS

本文对于微通道内稀薄气体二维可压缩滑移流动建立了数学模型,采用连续介质流动控制方程与壁面速度滑移和温度跳跃边界条件相组合描述该问题,并利用SIMPLE算法求解,所得结果与文献进行了对比,在相同条件下得到了较高的一致性.文中利用该计算模型的计算结果分析了气体的压缩性和稀薄性对微通道气体流动的影响,结果表明在所计算工况下稀薄性的影响更大。

A two-dimensional compressible slip flow and heat transfer model is established to study the gaseous flows in micro-channels. The continuum equations are solved with slip velocity and temperature jump boundary conditions, and the pressure and velocity are linked by the SIMPLE algorithm. To verify the model, the numerical results were compared with available reference papers and got comparative accordance under the same conditions. Then the computational results were used to analysis the effects of compressibility and rarefaction on gaseous flows in micro-channels. It was also found that the effect of rarefaction on heat transfer and flow is greater than that of compressibility under the studied conditions.