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Rarefaction and temperature gradient Effect on the Performance of the Knudsen Pump

Chinese Journal of Mechanical Engineering 2012年第4期25卷 745-752页

作者： YE Jianjun YANG Jian ZHENG Jinyang DING Xianting WONG Ieong LI Weizhong CHEN Cong Institute of Process Equipment Zhejiang University Hangzhou 310027 China Engineering Research Center of High Pressure Process Equipment and SaJety oJ Mini'~try oJ l~ctucatton Zhejiang University Hangzhou 310027 China Department of Mechanical andAerospace Engineering University of California Los Angeles 90095 U.S.A School of Energy and Power Engineering Dalian University of Technology Dalian 116024 China

The prediction of the multiscale flow in the Knudsen pump is important for understanding its pumping ***,there is little research on such interesting multiscale phenomenon in the Knudsen *** this paper,a novel numerical analysis method combining the direct simulation Monte Carlo（DSMC） method with the smoothed particle hydrodynamics（SPH） method is presented for simulating the multiscale flow,which is often encountered in the application of the Knudsen *** and accuracy of the new method are given by comparing its results with that of the previous *** the coupled multiscale approach,the rarefaction and the temperature drive are studied,which are two main factors on the performance of the Knudsen *** investigate the effect of rarefaction on the performance of the Knudsen pump,various pump operation pressures are *** flow characteristics and pumping ability at different rarefaction are analyzed,and the phenomenon of the multiscale flow is also *** cases with different linear or nonlinear temperature gradients are set to investigate the effect of temperature gradient on the performance of the Knudsen *** flow characteristics of the Knudsen pump such as the velocity,pressure increase,and the mass flowrate are presented.A unique phenomenon,the reverse transpiration effect caused by the nonlinear temperature gradient is studied,and the reason of the significant pressure increase in the pump channel is also *** the multiscale gas flow is widely encountered in the microflow systems,the above method and its results can also be greatly beneficial and provide significant insights for the design of the MEMS devices.

关键词： thermal transpiration Knudsen pump mass flowrate rarefaction temperature gradient-driven

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