Axial development of interfacial structure of vertical downward bubbly flow |
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| Affiliation: | 1. Research Reactor Institute, Kyoto University, Kumatori, Sennan, Osaka 590-0494, Japan;2. School of Nuclear Engineering, Purdue University, 400 Central Drive, West Lafayette, IN 47907-2017, USA;3. Division of System Analysis and Regulatory Effectiveness Office of Research, US Nuclear Regulatory Commission, Washington, DC 20555, USA;1. Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8654, Japan;2. Nuclear Professional School, School of Engineering, The University of Tokyo, 2-22 Shirakata, Tokai-mura, Ibaraki 319-1188, Japan;1. Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. Nuclear Professional School, School of Engineering, The University of Tokyo, 2-22 Shirakata, Tokai-mura, Ibaraki 319-1188, Japan;1. European Commission, Joint Research Centre, Institute for Energy and Transport, P.O. Box 2, NL-1755ZG Petten, The Netherlands;2. Nuclear Research and consultancy Group, NL-1755ZG Petten, The Netherlands;3. European Commission, DG ENER, L-2530 Luxembourg, Luxembourg;4. LGI Consulting, 13 rue Marivaux, F-75002 Paris, France;1. Division of Environmental Engineering Science, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan;2. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1-N1-22 Ookayama, Meguro-ku, Tokyo 152-8550, Japan;1. School of Nuclear Science and Technology, Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology, State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. Shanghai Nuclear Engineering Research & Design Institute, Shanghai 200233, China |
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| Abstract: | Accurate prediction of the interfacial area concentration is essential to successful development of the interfacial transfer terms in the two-fluid model. Mechanistic modeling of the interfacial area concentration entirely relies on accurate local flow measurements over extensive flow conditions and channel geometries. From this point of view, accurate measurements of flow parameters such as void fraction, interfacial area concentration, and interfacial velocity were performed by a multi-sensor probe at three axial locations as well as seven radial locations in vertical downward bubbly flows using a 25.4 mm-diameter pipe. In the experiment, the superficial liquid velocity and the void fraction ranged from −1.25 to −3.11 m/s and from 1.61% to 21.0%, respectively. |
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