Low Reynolds-number moment on asymmetric bodies |
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| Institution: | 1. Fuel Cell Research Center, Korea Institute of Science and Technology (KIST), Seongbuk-gu, Seoul 02792, Republic of Korea;2. Division of Energy & Environment Technology, KIST School, University of Science and Technology (UST), Seongbuk-gu, Seoul 02792, Republic of Korea;3. Chemical Technology Faculty, NTUU Igor Sykorsky Kyiv Polytechnic Institute, Kyiv 03056, Ukraine;4. Transfercenter Sustainable Electrochemistry, Saarland University, 66125 Saarbrücken, Germany;5. Korea Institute of Science and Technology (KIST) Europe, Campus E7 1, 66123 Saarbrücken, Germany;6. School of Chemical and Biological Engineering, Seoul National University, Gwanak-gu, Seoul 08826, Republic of Korea;7. Technical University of Denmark, Department of Energy Conversion and Storage, Elektrovej 375, 2800 Kgs. Lyngby, Denmark;8. Green school, Korea University, Seoul 136-713, Republic of Korea;1. Laboratoire de Réactivité et Chimie des Solides (LRCS), Université de Picardie Jules Verne, Hub de l’Energie, UMR CNRS 7314, 15 rue Baudelocque, 80039, Amiens, France;2. Réseau sur le Stockage Electrochimique de l’Energie (RS2E), Hub de l’Energie, FR CNRS 3459, 15 rue Baudelocque, 80039, Amiens, France;3. ALISTORE-European Research Institute, Hub de l’Energie, FR CNRS 3104, 15 rue Baudelocque, 80039, Amiens, France;4. Umicore, 31 rue Marais, 1000 Brussels 8, Belgium;5. Institut Universitaire de France, 103 boulevard Saint Michel, Paris, 75005, France;1. Advanced Material Engineering Division, Toyota Motor Corporation, 1200 Mishuku, Susono, Shizuoka, 410-1193, Japan;2. School of Earth, Energy and Environmental Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami City, Hokkaido, 090-8507, Japan;1. Particle Technology Laboratory, Mechanical Engineering, University of Minnesota, 111 Church St., S.E., Minneapolis, MN 55455, USA;2. Department of Environmental Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea;3. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China;4. Particle Pollution Research and Management Center, Inha University, Incheon 21999, Republic of Korea |
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| Abstract: | The moment induced on asymmetric particles by a low Reynolds-number flow is examined. A flat disk and a half sphere are suspended in low-velocity airflow and the moment exerted on the particles is measured as a function of Reynolds number and approach angle. Object Reynolds-numbers range between 20 and 200, and the measured moment is in the nNm range. A moment coefficient (a moment normalized with the drag force and object radius) is calculated from the moment measurements and found to generally decrease with increasing Reynolds number. Stable approach angle positions are identified for the objects in the flow, and it is shown that the objects tend to rotate towards the position of maximum drag (local extremum) from other approach angles. The present measurements are consistent with previous qualitative observations of free-falling particles. |
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