微小矩形通道内气体层流换热的数值模拟

NUMERICAL SIMULATION FOR LAMINAR HEAT TRANSFER OF GAS IN RECTANGLAR MICROPASSAGES

在基于贴壁层概念和已经求得的贴壁层内气体热导率变化规律的基础上 ,数值求解了微小矩形通道内气体层流已充分发展时 ,在壁面等热流边界条件下的温度分布和换热 ,得到了矩形微通道在不同截面长宽比 ζ和不同Knudsen数下的量纲一的温度分布和 Nu 值 ,并进行了相应的讨论。

Theoretical investigations are performed on the dev eloped laminar convective heat transfer characteristics for incompressible gases flow through rectangular micropassages with constant wall heat flux. Mathematic al models are proposed for considering the change in thermal conductivity of gas in the wall-adjacent region from the kinetic theory. The dimensionless temperat ure distribution and corresponding heat transfer characteristics were both simul ated numerically,and the results are compared to other report simulations with b rief discussions.