Correlations for the mass transfer rate of droplets in vertical upward annular flow |
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| Affiliation: | 1. Faculty of Engineering, University of Nottingham, Nottingham, United Kingdom;2. Kutateladze Institute of Thermophysics, Novosibirsk, Russia;3. Novosibirsk State University, Novosibirsk, Russia;1. Department of Nuclear Engineering, Chongqing University, Chongqing 400044, PR China;2. School of Nuclear Engineering, Purdue University, 400 Central Dr., West Lafayette, IN 47907-2017, USA;1. Dept. of Advanced Mechanical Systems, Kumamoto Univ., 39-1, Kurokami 2-chome, Chuou-ku, Kumamoto 860-8555, Japan;2. Plant Design & Engineering Dept., Environment, Energy & Plant Headquarters, Hitachi Zosen Corporation, 7-89, Nankokita 1-chome, Suminoe-ku, Osaka, 559-8559, Japan;1. School of Nuclear Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;2. Science and Technology on Reactor System Design Technology Laboratory (Nuclear Power Institute of China), Chengdu 610041, China;3. Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 400044, China |
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| Abstract: | New correlations for the deposition rate and entrainment rate of droplets in vertical upward annular flow were developed from simple models and available experimental data. In the correlation for the deposition rate, the superficial gas velocity was used as the parameter of primary importance at low droplet concentration while the droplet concentration itself at high droplet concentration. In correlating the rate of droplet entrainment, the ratio of interfacial shear force to the surface tension force acting on the surface of liquid film was the appropriate scaling parameter to correlate the experimental data measured in varied conditions. The experimental data for air–water annular flow were used in the development of the present correlations since extensive databases were available. It was however confirmed that the present model provides satisfactory agreements with the experimental data for high-pressure steam–water annular flow. |
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