Characteristics of thermal transpiration effect and the hydrogen flow behaviors in the microchannel with semicircular obstacle |
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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;3. Qilu University of Technology, The Institute of Oceanographic Instrumentation, Qingdao, 266001, China;1. Department of Mechanics, Tianjin University, Tianjin 300072, China;2. Tianjin Key Laboratory of Nonlinear Dynamics and Control, Tianjin 300072, China;1. College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China;2. Shandong Shida Oilfield Technical Services CO., LTD., Dongying, 257000, China;3. Jiangsu Gas Storage Branch Company of Huabei Petroleum Administration, Changzhou, 213000, China;4. Exploration and Development Institute of PetroChina Huabei Oilfied Company, Renqiu, 062550, China;1. Departments of Chemical Engineering, College of Engineering, Wonkwang University, Iksan, Jeonbuk, 54538, Republic of Korea;2. Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Motooka 744, Nishi-Ku, Fukuoka, 819-0395, Japan;3. International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, Motooka 744, Nishi-Ku, Fukuoka, 819-0395, Japan;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 |
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| Abstract: | The thermal transpiration effect has great potential applications for the hydrogen energy. In this paper, the thermal transpiration effect and the hydrogen flow behaviors are studied in the microchannel with the semicircular obstacles. Firstly, the slip boundary model is used in the simulation of the flow performance in the microchannel. The validity of the model at different Kn is verified by comparing with some previous work. Then, the hydrogen flow characteristics of the thermal transpiration effect with the semicircular obstacle are investigated. The result shows that as the size of the semicircular obstacle increases, the hydrogen flow path of the thermal transpiration effect becomes longer, and the temperature gradient decreases. As the characteristic length of the hydrogen flow decreases, there is an obviously negative influence on the thermal transpiration flow. A deeper analysis shows that the thermal driven flow and the pressure driven flow will produce y-component velocity, which leads to a backflow under the effect of semicircles, and the semicircular obstacles make the Knudsen layer spread to the channel center. |
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| Keywords: | Thermal transpiration effect Hydrogen flow Knudsen number Slip boundary conditions Velocity distribution |
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