Effect of the microchannel obstacles on the pressure performance and flow behaviors of the hydrogen Knudsen compressor |
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| Affiliation: | 1. School of Power and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;2. The State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou, 310027, China;1. Department of Safety Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China;2. College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China;3. Institute of Solid Mechanics, Zhejiang University of Technology, Hangzhou 310014, China;4. Center for Offshore Equipment and Safety Technology, China University of Petroleum (East China), Qingdao 266580, China;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230027, PR China;2. School of Civil Engineering, Hefei University of Technology, Hefei 230009, PR China;3. Anhui International Joint Research Center on Hydrogen Safety, Hefei, 230009, China;1. Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China;2. Structural Integrity & Composites Group, Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS Delft, the Netherlands;3. State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China;4. Northeast Petroleum University, Heilongjiang Daqing 163318, China |
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| Abstract: | The hydrogen Knudsen compressor has potential applications on the hydrogen transmission for the microdevices and systems. In this paper, the numerical model of the hydrogen Knudsen compressor was established, combining the N S continuity equations with the slip boundary conditions. The effect of structures on the performance of the hydrogen Knudsen compressor is studied by generating different obstacles in the microchannels. This paper is mainly concerned on the rectangular and the triangular obstacles, and the influence of the obstacles length and height are investigated, respectively. The Knudsen number distribution and the rarefaction of the hydrogen gas flow are analyzed. Also, the characteristic of the pressure increase for the compressor under different parameters are investigated and discussed. The effect of the structure parameters on the flow velocity distributions are detailed described, as well as the velocity contour and the vortex distributions. Moreover, the variation of the Knudsen layers of the hydrogen gas flow in the hydrogen Knudsen compressor is presented, and the key factor of the Knudsen layers is analyzed and discussed. The results is significantly beneficial for the applications and designs of hydrogen Knudsen compressor. |
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| Keywords: | Thermal transpiration effect Hydrogen Knudsen compressor Poiseuille flow Pressure increase Knudsen layer |
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