DSMC SIMULATION OF MICROSCALE BACKWARD-FACING STEP FLOW

Authors: Xue H.¹; Chen S.²

Source: Microscale Thermophysical Engineering, Volume 7, Number 1, January/February/March 2003 , pp. 69-86(18)

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Abstract:

The direct simulation Monte Carlo (DSMC) method was used to simulate microbackward-facing step flows in both slip and transition flow regimes. A DSMC code was developed and validated with microchannel flows. The effects of Kn number in flow characteristics were analyzed in detail. It was found that the phenomena of flow separation, recirculation, and reattachment will disappear as Kn number exceeds 0.1. A significant jump of pressure and velocity behind the step was observed in the transition flow regime. The effect of the compressibility is also discussed. The compressibility has significant effect on flow characteristics in the slip flow regime but would be negated by the rarefaction in the transition flow regime.

Document Type: Research article

Affiliations: 1: Mechanical Engineering Department, California State Polytechnic University, Pomona, California, USA 2: Department of Mechanical & Industrial Engineering, University of Toronto, Toronto, Ontario, Canada

Publication date: 2003-01-01

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