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학술저널
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한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제52권 제5호
발행연도
2020.1
수록면
918 - 924 (7page)

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Film boiling is of great importance in nuclear safety as it directly influences the integrity of nuclear fuel incase of accidents involving loss of coolant. Recently, nuclear power plant safety under earthquake conditionshas received much attention. However, to the best of our knowledge, there are no existing studiesreporting film boiling in an oscillating system. Most previous studies for film boiling were performed onstationary systems. In this study, numerical simulations were performed for saturated film boiling ofwater on a horizontal surface under low frequencies to investigate the effect of system oscillation on filmboiling heat transfer. A coupled level-set and volume-of-fluid method was used to track the interfacebetween the vapor and liquid phases. With a fixed oscillation amplitude, overall, heat transfer decreaseswith oscillation frequency. However, there is a frequency region in which heat transfer remains nearlyconstant. This lock-on phenomenon occurs when the oscillation frequency is near the natural bubblerelease frequency. With a fixed oscillation frequency, heat transfer decreases with oscillation amplitude. With a fixed maximum amplitude of the additional gravity, heat transfer is affected little by the combinationof oscillation amplitude and frequency.

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