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首页> 外文会议>4th International Conference on Nanochannels, Microchannels and Minichannels 2006(ICNMM2006) pt.A >COMPRESSIBILITY AND RAREFACTION EFFECTS ON PRESSURE DROP IN ROUGH MICROCHANNELS
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COMPRESSIBILITY AND RAREFACTION EFFECTS ON PRESSURE DROP IN ROUGH MICROCHANNELS

机译：粗糙微通道中压降的可压缩性和反射效应

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摘要

A numerical analysis of the flow field in rough microchan-nel is carried out with a finite volume compressible solver, including generalized Maxwell slip flow boundary conditions suitable for arbitrary geometries. Roughness geometry is modeled as a series of triangular shaped obstructions. Relative roughness from 0% to 2.65% were considered. Since for truly compressible flow we have no fully developed flow condition, the simulation is performed over the whole length of the channel. A wide range of Mach number is considered, from nearly incompressible to chocked flow conditions. Flow conditions with Reynolds number up to around 200 were computed. The outlet Knudsen number corresponding to the chosen range of Mach and Reynolds number ranges from very low value to 0.0249. Performance charts are presented in terms of both average and local Poiseuille number as a function of local Kn, Ma and Re. In particular, it appears that roughness strongly decreases the reduction in pressure loss due to rarefaction. Thus, roughness effect is stronger at high Kn. Furthermore, compressibility effect has a major effect on pressure drop, as soon as local Mach number exceed 0.3.
机译：使用有限体积可压缩求解器对粗糙微通道中的流场进行了数值分析，包括适用于任意几何形状的广义麦克斯韦滑移流边界条件。粗糙度几何模型被建模为一系列三角形的障碍物。考虑从0％到2.65％的相对粗糙度。由于对于真正可压缩的流动，我们没有充分发展的流动条件，因此在通道的整个长度上进行模拟。从几乎不可压缩的流动到阻塞的流动条件，考虑了广泛的马赫数。计算出雷诺数高达200左右的流动条件。与所选马赫数和雷诺数范围相对应的出口克努森数范围从非常低的值到0.0249。性能图以平均和本地Poiseuille数的形式表示，是本地Kn，Ma和Re的函数。特别地，似乎粗糙度大大降低了由于稀疏化引起的压力损失的减小。因此，在高Kn下粗糙度效果更强。此外，一旦局部马赫数超过0.3，可压缩性对压降就会产生重大影响。

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