Analysis of internal micro-scale gas flows with pressure boundaries using the DSMC method

Jong-Shinn Wu, K. C. Tseng

研究成果: Conference contribution同行評審

2 引文 斯高帕斯(Scopus)

摘要

The development and applications of a two-dimensional DSMC (Direct Simulation Monte Carlo) program for pressure boundaries using unstructured cells and its applications to typical internal micro-scale gas flows, including a micro-manifold, a micro-nozzle and a slider air bearing of computer hard disk, are described. This is aimed to further test the treatment of pressure boundaries by particle flux conservation; especially at subsonic speed, to gas flows involving many exits, more complicated geometry and moving boundaries. Firstly, results of a T-shaped micro-manifold with inlet Knudsen number of 0.2 show that excellent mass flow conservation between the inlet and two exits is obtained at low subsonic gas flows. Secondly, a micro-nozzle with the fixed inlet Knudsen number of 0.067 is simulated. For higher specified pressure ratio (exit to inlet), the location of maximum Mach number moves further downstream as the pressure ratio decreases; while, for lower specified pressure ratio, the Mach number increases all the way through the nozzle to the exit. Eventually, supersonic speed is observed at the exit for pressure ratio equal to or less than 0.143. Thirdly, for the gas flows of a slider air bearing of computer hard drive, the results agree very well with those of Alexander et al. (Phys. Fluids, 1994) for all the simulated conditions. In summary, the particle flux conservation concept has been proved successfully at multiple (more than two) pressure boundaries with complicated geometries and moving solid boundaries.

原文English
主出版物標題Rarefied Gas Dynamics
主出版物子標題22nd International Symposium
編輯Timothy J. Bartel, Michael A. Gallis
發行者American Institute of Physics Inc.
頁面486-493
頁數8
ISBN(電子)0735400253
DOIs
出版狀態Published - 9 七月 2001
事件22nd International Symposium on Rarefied Gas Dynamics - Sydney, Australia
持續時間: 9 七月 200014 七月 2000

出版系列

名字AIP Conference Proceedings
585
ISSN(列印)0094-243X
ISSN(電子)1551-7616

Conference

Conference22nd International Symposium on Rarefied Gas Dynamics
國家Australia
城市Sydney
期間9/07/0014/07/00

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