TY - JOUR
T1 - Experimental measurement on tangential momentum accommodation coefficient in a single microtube
AU - Yamaguchi, Hiroki
AU - Hanawa, Tsuneo
AU - Yamamoto, Oto
AU - Matsuda, Yu
AU - Egami, Yasuhiro
AU - Niimi, Tomohide
N1 - Funding Information:
Acknowledgments The authors are very grateful to Instrument Development Group of Technical Center, Nagoya University, for the measurement of the diameter of the microtubes. This research was partially supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid and Japan Society for the Promotion of Science.
PY - 2011/7
Y1 - 2011/7
N2 - The tangential momentum accommodation coefficient (TMAC) was investigated experimentally fromthe 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 meanKnudsen 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. TMACwas 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. Fromthe comparison between microtubes with different inner diameter, it is showed that TMAC is determined mainly by gas species and surface material.
AB - The tangential momentum accommodation coefficient (TMAC) was investigated experimentally fromthe 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 meanKnudsen 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. TMACwas 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. Fromthe comparison between microtubes with different inner diameter, it is showed that TMAC is determined mainly by gas species and surface material.
KW - Constant-volume method
KW - Gas-surface interaction
KW - Micro gas-flow
KW - Slip flow
KW - Tangential momentum accommodation coefficient
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U2 - 10.1007/s10404-011-0773-x
DO - 10.1007/s10404-011-0773-x
M3 - Article
AN - SCOPUS:84855910771
SN - 1613-4982
VL - 11
SP - 57
EP - 64
JO - Microfluidics and Nanofluidics
JF - Microfluidics and Nanofluidics
IS - 1
ER -