非定常加熱時の低熱流束膜沸騰遷移に関する研究

概要

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Premature transition to film boiling of nitrogen at stepwise heat generation has been investigated by measuring the time variation of heat transfer rate and taking high speed movie photographs. The boiling transition has occurred when the heat flux is more than about 15% of the critical heat flux in steady state. The initial bubble rapidly grows along the heater surface in the peculiar shape like a 'straw hat'. The boiling transition occurs during the settling of the initial bubble on the whole surface. A liquid layer may probably be existent under the bubble from the time variation of heat transfer rate corresponding to the bubble growth, though the bubble grows mainly due to the consumption of the superheat energy which is stored in the liquid until the boiling incipience. The minimal heat generation rate at which film boiling lasts after the boiling transition nearly equals to the minimal heat flux of film boiling in steady state.
一般社団法人日本機械学会の論文
1991-06-25