気泡微細化沸騰における圧力変動特性

概要

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Microbubble emission boiling (MEB) which appears in transition boiling region of subcooled liquid provides extremely high heat flux. That accompanies violent emission of many microbubbles and a large sound. An overview of many available data about MEB classified this phenomenon into three different types, i.e., stormy microbubble emission boiling I and II (S-MEB I and II), and calm microbubble emission boiling (C-MEB). In this experiment, observations of the bubble behavior with a high speed video camera and measurements of the pressure fluctuation with a pressure transducer were performed in each regime of boiling of subcooled water flowing vertically upward along the surface, to try to make clear their characteristic feature. Much higher peak pressure was observed in MEB I and II than in C MEB or film boiling. This peak in fluctuating pressure corresponds to the collapse or growth of each coalescent bubble, and the frequency of this peak is equal to the cycle of the bubble motion.
社団法人日本機械学会の論文
1999-03-25