CFD analysis on subcooled boiling phenomena in PWR coolant channel |
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| Affiliation: | 1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, CAS, Beijing 100190, China;2. Beijing Key Laboratory of Thermal Science and Technology, Technical Institute of Physics and Chemistry, CAS, Beijing 100190, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;1. Mechanical Engineering Department, Massachusetts Institute of Technology, 77 Mas Avenue, Cambridge, USA;2. Mechanical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt;3. Mechanical Engineering Department, Faculty of Engineering, KFUPM, Dhahran 31261, Saudi Arabia;1. GE Global Research, Bangalore 560066, India;2. School of Nuclear Engineering, Purdue University, 400 Central Drive, West Lafayette, IN 47907, USA;3. Bechtel Marine Propulsion Corporation, Bettis Laboratory, 814 Pittsburgh-McKeesport Blvd., West Mifflin, PA 15122, USA |
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| Abstract: | Eulerian two-fluid model coupled with wall boiling model was employed to calculate the three dimensional flow field and heat transfer characteristics in a hot channel with vaned spacer grid in PWR. The heat transfer from pellet-gap-cladding to coolant was also taken into account by a system coupled code MpCCI. The wall boiling model utilized in this study was validated by Bartolomei experiment data, and a good agreement can be observed. By solving the governing equation in a two-way coupled method, the distribution of temperature in the pellet-gap-cladding region and the distribution of temperature, void fraction and velocity of two-phase flow in coolant channel can be obtained. The influences of spacer grid and mixing vane on the thermal-hydraulic characteristics were analyzed. The heat transfer capacity was strongly improved by the spacer grid and mixing vane, while the flow resistance was also enlarged. Localized volume fraction of vapor phase decreased due to mixing vane, which will decrease the possibility of the departure from nucleate boiling (DNB) and increase the critical heat flux (CHF). By analyzing the temperature and void fraction at cladding outer surface, the critical regions where hot spot may occur were determined. |
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| Keywords: | Subcooled boiling Fuel assembly Hot spot Spacer grid |
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