Experimental measurement on tangential momentum accommodation coefficient in a single microtube
Experimental measurement on tangential momentum accommodation coefficient in a single microtube
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DOI：
10.1007/s10404-011-0773-x
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发表时间：
2011-02
影响因子：
2.8
通讯作者：
H. Yamaguchi;T. Hanawa;Oto Yamamoto;Y. Matsuda;Y. Egami;T. Niimi
中科院分区：
文献类型：
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作者：
H. Yamaguchi;T. Hanawa;Oto Yamamoto;Y. Matsuda;Y. Egami;T. Niimi
实验研究了滑移流和转换区早期通过单根微管的质量流量对切向动量调节系数的影响。在平均努森数小于0.3的情况下，应用二阶滑移边界条件，以微管进出口平均压力为基础，采用定容法进行测量。为了测量不同材料上的TMAC，使用了相当大的微管，这就要求减少泄漏。TMAC是由质量流量与平均克努森数的关系确定的滑移系数得到的。得到的质量流量用理论方程进行了很好的解释。对失活熔融二氧化硅与Ar、N、O的TMAC进行了测量，结果表明切向动量不能完全适应表面，与前人的研究结果吻合较好。通过对不同内径的微管的比较，发现TMAC主要由气体种类和表面材料决定。
The tangential momentum accommodation coefficient (TMAC) was investigated experimentally from the mass flow rate through a single microtube under the slip flow and the early part of the transition regime. The measurements were carried out by the constant-volume method under the mean Knudsen number smaller than 0.3, which is based on the mean pressure of the inlet and the outlet of the microtube, to apply the second-order slip boundary condition. To measure TMACs on various materials, quite large microtube was employed, which require the reduction in leakage. TMAC was obtained from the slip coefficient determined by the relation of the mass flow rate to the mean Knudsen number. The obtained mass flow rate was well explained by the theoretical equation. TMACs of deactivated-fused silica with argon, nitrogen, and oxygen were measured, showing the tangential momentum was not accommodated completely to the surface, and the values showed good agreement with previous studies. From the comparison between microtubes with different inner diameter, it is showed that TMAC is determined mainly by gas species and surface material.