The hydrogen flow characteristics of the multistage hydrogen Knudsen compressor based on the thermal transpiration effect |
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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. 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. Moscow Institute of Physics and Technology, Dolgoprudny, Russian Federation;2. National Research Centre “Kurchatov Institute”, Russian Federation;3. Dorodnicyn Computing Centre of RAS, Russian Federation;1. Institute of Process Equipment, Zhejiang University, Hangzhou, 310027, PR China;2. Institute of Applied Mechanics, Zhejiang University, Hangzhou, 310027, PR China;1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;2. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing, 400044, China;3. Institute of New Energy, Wuhan, 430074, China;1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;2. China Aerodynamics Research and Development Center, Mianyang, 621000, China |
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| Abstract: | Multistage hydrogen Knudsen compressor based on the thermal transpiration effect has very exciting prospect for the hydrogen transmission in the micro devices. Understanding of the hydrogen flow characteristic is the key issue for the designs and applications of the hydrogen energy systems. Firstly, the numerical models of the multistage hydrogen Knudsen compressor are established. The distributions of the rarefaction, velocity and temperature at different stages of the hydrogen flow are calculated and presented. Moreover, the dimensional pressure increases of the hydrogen gas flow are analyzed, and the flow behaviors in the microchannel and the connection channel are discussed. Secondly, the numerical simulation at different connection channel height is implemented, and the hydrogen gas flow characteristics in the connection are analyzed. Especially, the performances of the pressure drop in the connection channel under different channel heights are studied, and the hydrogen gas compression characteristics of different cases are compared and discussed. Also, the effect of the connection channel height on the hydrogen gas pressure increase in the microchannel is investigated. The studies presented in this paper could be greatly beneficial for the hydrogen detection and transmission. |
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| Keywords: | Thermal transpiration effect Hydrogen flow Pressure increase Hydrogen Knudsen compressor Flow vortex |
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