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| Lattice Boltzmann simulation of the gas flow in complex microchannels |
| Received:March 02, 2021 Revised:October 20, 2021 |
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| DOI：10.7511/jslx20210302001 |
| KeyWord:lattice Boltzmann method Knudsen layer micro-scale effect gas seepage |
| Author | Institution |
| 姚杰 |
大连理工大学 海洋能源利用与节能教育部重点实验室, 大连 |
| 董波 |
大连理工大学 海洋能源利用与节能教育部重点实验室, 大连 |
| 李维仲 |
大连理工大学 海洋能源利用与节能教育部重点实验室, 大连 |
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| Abstract: |
| In this paper,a multi-relaxation-time lattice Boltzmann model for simulating gas flow in complex microchannels is constructed.The dynamic slip boundary over a curved surface is adopted,and the micro-scale effect and the influence of the Knudsen layer are considered.To describe slip velocity in the microchannel accurately,the local Knudsen number in the pores is introduced instead of the average Knudsen number.Then the Poiseuille flow is simulated to validate the proposed model.The simulation results are in good agreement with the results obtained by the direct Monte Carlo method and molecular simulation,which proves the feasibility of the proposed model in simulating gas flow in microchannels in the slip zone and transition zone.Finally,the gas seepage process in porous media is investigated.The results show that as the average Knudsen number of pores increases,the high permeability area in the porous media increases,and it increase more at smaller cross-sections,because the micro-scale effect is more obvious in the small pores,which is caused by the smaller flow resistance in the relatively small pores. |
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