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.
- Nanotechnology Institute
Investigation of Flow Resistance in Microchannels With a Sudden Contraction or Expansion Using DSMC
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Yan, X, Wang, Q, Suo, X, & Wu, Y. "Investigation of Flow Resistance in Microchannels With a Sudden Contraction or Expansion Using DSMC." Proceedings of the 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. pp. 715-721. ASME. https://doi.org/10.1115/MNHT2008-52172
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