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Simulations of Micro Gas Flows by the DS-BGK Method

[+] Author Affiliations
Jun Li

King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia; Tsinghua University, Beijing, China

Paper No. ICNMM2011-58010, pp. 269-278; 10 pages
doi:10.1115/ICNMM2011-58010
From:
  • ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels
  • ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels, Volume 1
  • Edmonton, Alberta, Canada, June 19–22, 2011
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4463-2
  • Copyright © 2011 by ASME

abstract

For gas flows in micro devices, the molecular mean free path is of the same order as the characteristic scale making the Navier-Stokes equation invalid. Recently, some micro gas flows are simulated by the DS-BGK method, which is convergent to the BGK equation and very efficient for low-velocity cases. As the molecular reflection on the boundary is the dominant effect compared to the intermolecular collisions in micro gas flows, the more realistic boundary condition, namely the CLL reflection model, is employed in the DS-BGK simulation and the influence of the accommodation coefficients used in the molecular reflection model on the results are discussed. The simulation results are verified by comparison with those of the DSMC method as criteria.

Copyright © 2011 by ASME

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