微管道气体流动的蒙特卡洛直接模拟

DSMC FOR GAS FLOWS IN A MICROCHANNEL

采用蒙特卡洛直接模拟 (DSMC)方法 ,数值模拟了微管道中压力驱动的气体流动 ,结果表明固壁边界存在速度滑移 ,稀薄气体效应明显 ;整个流场温度变化很小 ,流动马赫数很小 ,密度、压力流向变化非常大而横向几乎不变 ;可压缩性导致压力随流向的非线性分布 。

Gas flows driven by pressure in a microchannel are computed with the direct simulation Monte Carlo(DSMC) method. The rarefied effect is observed and slip velocity exists at solid boundaries. Temperature is almost constant in the whole flow field. The Mach number of the flow is very low. Density and pressure vary significantly along the channel while they are nearly invariant transversely. Nonlinearity of pressure distribution along the channel due to compressibility is found and reduces as the Knudsen number increases.