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Investigation of Flow Resistance in Microchannels With a Sudden Contraction or Expansion Using DSMC

[+] Author Affiliations
Xiaohong Yan, Qiuwang Wang, Xiaona Suo, Yinin Wu

Xi’an Jiaotong University, Xi’an, Shaanxi, China

Paper No. MNHT2008-52172, pp. 715-721; 7 pages
doi:10.1115/MNHT2008-52172
From:
  • ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer
  • ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer, Parts A and B
  • Tainan, Taiwan, June 6–9, 2008
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4292-4 | eISBN: 0-7918-3813-7
  • Copyright © 2008 by ASME

abstract

Nitrogen gas flow in two-dimensional microchannels with a sudden contraction or expansion is simulated by direct simulation Monte Carlo (DSMC) method in both slip and transition regimes. The resistance coefficient is calculated and compared with that for conventional-scale channels. It is found that the resistance coefficient for microchannels differs from that for conventional-scale channels in two aspects. One is the resistance coefficient for microchannels is much smaller and the divergence between microchannels and conventional-scale channels increases with the increase of Knudsen number. For the cases considered in this paper, the coefficients for microchannels are about 5% to 61% of those for conventional-scale channels. On the other hand, the resistance coefficient for microchannels is more sensitive to the expansion ratio of channels, especially when the expansion ratio is less than 3.

Copyright © 2008 by ASME

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