计算物理 ›› 2010, Vol. 27 ›› Issue (3): 389-395.

• 研究论文 • 上一篇    下一篇

微通道中气体流动的格子Boltzmann数值模拟

聂德明1, 郭晓辉1, 林建忠1,2   

  1. 1. 中国计量学院计量测试工程学院, 浙江 杭州 310018;
    2. 浙江大学力学系, 浙江 杭州 310027
  • 收稿日期:2009-01-04 修回日期:2009-06-22 出版日期:2010-05-25 发布日期:2010-05-25
  • 作者简介:聂德明(1979-),男,福建三明,博士生,从事纳米颗粒多相流研究.
  • 基金资助:
    浙江省重大科技专项(10632070)资助项目

Lattice-Boltzmann Method for Gas Flow in Microchannels

NIE Deming1, GUO Xiaohui1, LIN Jianzhong1,2   

  1. 1. College of Metrology and Technology Engineering, China Jiliang University, Hangzhou 310018, China;
    2. Department of Mechanics, Zhejiang University, Hangzhou 310027, China
  • Received:2009-01-04 Revised:2009-06-22 Online:2010-05-25 Published:2010-05-25

摘要: 采用可压缩格子Boltzmann模型及非平衡外推边界条件,数值模拟微通道中的气体在滑移区域(Kn≤0.1)内的流动,计算结果包括出口速度剖面、通道中心压力分布以及质量流率等,与理论结果及其他实验结果符合得很好.还模拟了180°弯曲通道中的气体流动.结果表明,滑移速度的存在抑制了边界层的分离,因此在弯曲处不存在漩涡.计算结果还表明,弯道的存在显著影响了气体的质量流率.

关键词: 微流动, 格子Boltzmann方法, Knudsen数, 弯道

Abstract: A compressible lattice-Boltzmann model coupled with non-equilibrium extrapolation method are adopted to simulate gas flow in microchannels at slip regime (Kn≤0.1).Numerical results,including velocity profiles at outlet,pressure distributions and mass flowrates,agree well with analytical solutions and experimental results.In addition,gas flow in a 180 degree curved channel is numerically simulated.It shows that boundary layer separation is suppressed by slip velocity at the wall.In addition,mass flowrate of a curved channel is smaller than that of a straight one.

Key words: microfluids, lattice Boltzmann method, Knudsen number, cureved channel

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