| Pseudo-particle modeling for gas flow in microchannels |
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| 作者姓名： | WANG LiMin GE Wei CHEN FeiGuo |
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| 作者单位： | [1]State Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China [2]Graduate University, Chinese Academy of Sciences, Beijing 100049, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China （Grant Nos. 20336040, 20490201 and 20221603）, and the Knowledge Innovation Program of the Chinese Academy of Sciences （Grant No. KJCX-SW-L08）.The authors wish to thank Prof Li Jinghai, Dr. Li Ying and Prof. Luo Lingai for illuminative discussion. |
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| 摘 要： | The velocity profiles and temperature distributions of gas flow in microchannels, for Knudsen numbers ranging from 0.01 to 0.20, are investigated with pseudo-particle modeling (PPM). It has been found that the velocity profiles are mainly affected by Knudsen number and the external force fields applied. When Knudsen number was increased, the slip velocities on the walls increased at the beginning, and then decreased. The temperature distributions were also significantly affected by the external force. The Darcy friction factor increased with increasing Knudsen number, and its variation with Mach number under increased Knudsen number was similar to the so-called premature laminar-turbulent transition observed in experiments.
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| 关 键 词： | 微通道 气体流动 伪粒子模型 努森数 马赫数 |
| 收稿时间： | 2 June 2006 |
| 修稿时间： | 2006-06-022006-11-02 |
Pseudo-particle modeling for gas flow in microchannels |
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| WANG LiMin GE Wei CHEN FeiGuo.Pseudo-particle modeling for gas flow in microchannels[J].Chinese Science Bulletin,2007,52(4):450-455. |
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| Authors: | Wang LiMin Ge Wei Chen FeiGuo |
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| Institution: | (1) State Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100080, China;(2) Chinese Academy of Sciences, Graduate University, Beijing, 100049, China |
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| Abstract: | The velocity profiles and temperature distributions of gas flow in microchannels, for Knudsen numbers ranging from 0.01 to 0.20, are investigated with pseudo-particle modeling (PPM). It has been found that the velocity profiles are mainly affected by Knudsen number and the external force fields applied. When Knudsen number was increased, the slip velocities on the walls increased at the beginning, and then decreased. The temperature distributions were also significantly affected by the external force. The Darcy friction factor increased with increasing Knudsen number, and its variation with Mach number under increased Knudsen number was similar to the so-called premature laminar-turbulent transition observed in experiments. |
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| Keywords: | pseudo-particle modeling microchannel Knudsen number Mach number |
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