Determination of slip coefficient for rarefied gas flows using direct simulation Monte Carlo

Citation
Ls. Pan et al., Determination of slip coefficient for rarefied gas flows using direct simulation Monte Carlo, J MICROM M, 9(1), 1999, pp. 89-96
Citations number
9
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Eletrical & Eletronics Engineeing
Journal title
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
ISSN journal
0960-1317 → ACNP
Volume
9
Issue
1
Year of publication
1999
Pages
89 - 96
Database
ISI
SICI code
0960-1317(199903)9:1<89:DOSCFR>2.0.ZU;2-1
Abstract
A qualitative analysis is first carried out to determine the slip coefficie nt as a function of two dimensionless parameters. An intensive computation using the direct simulation Monte Carlo method is then carried out to simul ate the Couette flows between two walls for different gas, number density, wall (plate) velocity (U-w), wall temperature (T-w) and distance between th e two walls. Numerical results show that the slip coefficient is proportion al to the mean free path lambda(gw) of molecules colliding with the wall, w hich is affected by the number density, the wall temperature and gas mass. The slip coefficient is finally found to be 1.125 lambda(gw). This slip coe fficient is verified for five gases, and validated under the conditions of U-w less than or equal to 300 m s(-1) and T-w less than or equal to 500 K. This slip coefficient is very useful for slip flow analysis in micro-electr o-mechanical systems using N-S equations.