| 題名: | The Friction Characteristics of Gaseous Slip Flow in Microtubes |
| 其他題名: | 微圓管滑動氣體流場摩擦特性之探討 |
| 作者: | 陳慶祥;Chen, Ching-shung;康尚文;Kang, Shung-wen;郭維仁;Kuo, Wei‐jen |
| 貢獻者: | 淡江大學航空太空工程學系 |
| 關鍵詞: | 滑動流;微流道;微機電系統 Slip flow;Microtube flow;MEMs |
| 日期: | 2001-09 |
| 上傳時間: | 2013-07-11 11:55:59 (UTC+8) |
| 出版者: | Taipei : Chinese Institute of Chemical Engineers |
| 摘要: | The present work studies the friction characteristics of gaseous
slip flow in microtubes. The reduced diameter of microtubes has significant
influences on the flow. The degree of influence depends on
the Knudsen number. If the Knudsen number is in the range of 10−3 to
0.1, the fluid can be assumed to be a continuum but a slip boundary
condition at the tube wall has to be employed to account for the incomplete
tangential momentum and energy exchanges between the gas molecules
and the wall. Although slip flow in microtubes can be investigated
by solving numerically the compressible Navier-Stokes equations,
the hyperbolic-parabolic character of the equations makes it very
inefficient. The very large length to diameter ratio of microtube flows
suggests that they can be predicted accurately as well as efficiently by
solving the compressible boundary-layer equations. The parabolic character
of the boundary-layer equations renders the present method a very
efficient and accurate tool in studying slip flows. The results confirm
the findings of earlier investigators that the product of f . Re is smaller
for laminar microtube flows than that predicted by the conventional
theory when the flow is in the slip region. |
| 關聯: | Journal of the Chinese Institute of Engineers=中國工程學刊 24(5), pp.641-647 |
| DOI: | 10.1080/02533839.2001.9670661 |
| 顯示於類別: | [航空太空工程學系暨研究所] 期刊論文
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