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Numerical Heat Transfer, Part A: Applications
An International Journal of Computation and Methodology
Volume 59, 2011 - Issue 8
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Original Articles

Continuum Simulation of the Microscale Backward-Facing Step Flow in a Transition Regime

Fu-bing Bao Flow Measurement and Simulation Institute, China Jiliang University, Hangzhou, People's Republic of ChinaCorrespondence[email protected]
&
Jian-zhong Lin Flow Measurement and Simulation Institute, China Jiliang University, Hangzhou, People's Republic of China; Department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, People's Republic of China
Pages 616-632 | Received 21 Jul 2010, Accepted 13 Jan 2011, Published online: 20 Apr 2011
 
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Abstract

Microscale backward-facing step flows in transition regime are investigated in the present study using continuum-based Burnett equations. A relaxation method on the Burnett terms is proposed here, and convergent results at Knudsen number up to 0.5 are achieved. The results of Burnett equations agree very well with experimental data and direct simulation Monte Carlo (DSMC) results. The detailed flow characteristics of backward-facing step flow in transition regime are presented, and the difference from macro flow is analyzed. The effects of pressure ratio, Kn, and step ratio are discussed.

Acknowledgments

This work was supported by the Natural Science Foundation of Zhejiang Province (grant no. Y6090589), and the National Natural Science Foundation of China (grant no. 10902104).

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