Theoretical studies on transient pool boiling based on microlayer model |
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Authors: | Yao-Hua Zhao Takashi MasuokaTakaharu Tsuruta |
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Affiliation: | a Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China b Department of Mechanical Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan c Department of Mechanical Engineering and Science, Kyushu University, Fukuoka 812-8581, Japan d Department of Mechanical Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan |
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Abstract: | An analytical model for transient pool boiling heat transfer was developed in this study. The boiling curves of the transient boiling were obtained based on the microlayer model proposed by the authors and the mechanism of transition from the non-boiling regime to film boiling, i.e., direct transition was theoretically examined. Since the nucleate boiling heat flux is mainly due to the evaporation of the microlayer and its initial thickness decreases rapidly with increasing superheat, the duration of nucleate boiling is markedly decreased as the incipient boiling superheat is increased. It is found that the direct transition is closely connected to the rapid dryout of the microlayer which occupies almost the whole surface at high wall superheat. |
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