EFFECTS OF RAREFACTION AND COMPRESSIBILITY OF GASEOUS FLOW IN MICROCHANNEL USING DSMC
EFFECTS OF RAREFACTION AND COMPRESSIBILITY OF GASEOUS FLOW IN MICROCHANNEL USING DSMC
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使用 DSMC 对微通道中气体流动的稀疏性和压缩性的影响
DOI：
10.1080/10407780050135388
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Hongwei Sun, Mohammad Faghri
中科院分区：
文献类型：
--
作者：
Hongwei Sun, Mohammad Faghri
采用直接蒙特卡罗方法模拟了二维气体在滑移区和转捩区的微通道流动，研究了可压缩性和稀薄性对流动的影响。结果的轴向压力分布，速度分布，局部摩擦系数，和当地马赫数（Ma）的形式，并与现有的分析和实验结果进行了比较。可压缩性的影响进行检查的入口到出口的压力比范围从1.38到4.5。低压降模拟克努森数（Kn）范围从0.03到0.11进行，以确定稀疏的效果。结果表明，压缩性使轴向压力变化呈非线性，局部摩擦系数增大。另一方面，稀疏不影响压力分布，但会导致流动在壁面滑动并降低局部摩擦系数。此外，通过与DSMC结果的比较，发现局部充分发展（LFD）假设对低Ma流动是有效的。
The direct simulation Monte Carlo (DSMC) is performed for two-dimensional gaseous flow through a microchannel in both slip and transition regimes to understand the effects of compressibility and rarefaction. Results are presented in the form of axial pressure distribution, velocity profile, local friction coefficient, and local Mach number (Ma) and are compared with the available analytical and experimental results. The effect of compressibility is examined for the inlet to outlet pressure ratios ranging from 1.38 to 4.5. Low-pressure drop simulations with Knudsen numbers (Kn) ranging from 0.03 to 0.11 are performed to identify the effect of rarefaction. It was found that compressibility makes the axial pressure variation nonlinear and enhances the local friction coefficient. On the other hand, rarefaction does not affect pressure distribution but causes the flow to slip at the wall and reduces the local friction coefficient. In addition, it was found that the locally fully developed (LFD) assumption is valid for low Ma flows by comparison with DSMC results.