Void fraction measurement of bubble and slug flow in a small channel using the multivision technique |
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| Institution: | 1. College of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, China;2. College of Environment and Energy Engineering, Beijing University of Technology, Beijing 100000, China;1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China;2. Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610041, China;1. Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan;2. School of Nuclear Engineering, Purdue University, West Lafayette, IN 47907-2017, USA;3. Nuclear Safety Research Center, Japan Atomic Energy Agency, Tokai-mura, Ibaraki 319-1195, Japan;1. School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, RP China;2. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, RP China;1. Mechanical Engineering Department, LEPTEN/Boiling, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil;2. Mobility Department, Federal University of Santa Catarina, Joinville, SC 89218-000, Brazil;1. Department of Refrigeration and Cryogenics Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. Department of Process Equipment and Control Engineering, School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China |
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| Abstract: | Using the multivision technique, a new void fraction measurement method was developed for bubble and slug flow in a small channel. The multivision system was developed to obtain images of the two-phase flow in two perpendicular directions. The obtained images were processed—using image segmentation, image subtraction, Canny edge detection, binarization, and hole filling—to extract the phase boundaries and information about the bubble or slug parameters. With the extracted information, a new void fraction measurement model was developed and used to determine the void fraction of the two-phase flow. The proposed method was validated experimentally in horizontal and vertical channels with different inner diameters of 2.1, 2.9, and 4.0 mm. The proposed method of measuring the void fraction has better performance than the methods that use images acquired in only one direction, with a maximum absolute difference between the measured and reference values of less than 6%. |
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| Keywords: | Gas–liquid two-phase flow Void fraction Bubble flow Slug flow Multivision technique |
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