10511 溶融銅液滴からのフィラメント生成による膜沸騰蒸気膜崩壊ならびに蒸気爆発の発生(産学における混相研究(3),OS.13 産学における混相研究)

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Experiments were conducted in which a molten copper droplet released into water pool. Spontaneous vapor explosion did not occur when water temperature was over 50℃. Spontaneous vapor explosion did, however, occur when water temperature was lower than 50℃. A high-speed video frames explored the stages of vapor explosions: (1) a vapor film was formed and separates the copper droplet and surrounding water, (2) a filament of molten copper grew from the surface and deformed the vapor film, (3) the vapor film collapsed along the filament surface, and finally (4) triggering of vapor explosions occurred from the filament to the whole molten copper droplet. When the filament growth was observed, it triggered the vapor explosion in almost all .cases. When.. not, . vapor explosion was not observed and the vapor film was, therefore, stably formed around the molten copper droplet. We concluded that the filament form the molten copper triggered vapor explosion in a highly subcooled water.
一般社団法人日本機械学会の論文
2009-03-05