EXAMINATION OF THE LBM IN SIMULATION OF MICROCHANNEL FLOW IN TRANSITIONAL REGIME

Authors: C. Shen; D. B. Tian; C. Xie; J. Fan

Source: Microscale Thermophysical Engineering, Volume 8, Number 4, October/November/December 2004 , pp. 423-432(10)

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Abstract:

The gas flows in micro-electro-mechanical systems possess relatively large Knudsen number and usually belong to the slip flow and transitional flow regimes. Recently the lattice Boltzmann method (LBM) was proposed by Nie et al. in Journal of Statistical Physics, vol. 107, pp. 279-289, in 2002 to simulate the microchannel and microcavity flows in the transitional flow regime. The present article intends to test the feasibility of doing so. The results of using the lattice Boltzmann method and the direct simulation Monte Carlo method show good agreement between them for small Kn (Kn = 0.0194), poor agreement for Kn = 0.194, and large deviation for Kn = 0.388 in simulating microchannel flows. This suggests that the present version of the lattice Boltzmann method is not feasible to simulate the transitional channel flow.

Keywords: lattice Boltzmann equation (LBM); microchannel flow; transitional flow regime; DSMC method

Document Type: Research article

DOI: http://dx.doi.org/10.1080/10893950490516983

Affiliations: 1: High Temperature Gas Dynamics Laboratory, Institute of Mechanics, Chinese Academy of Science, Beijing, China

Publication date: 2004-10-01

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