非定常加熱時の低熱流束膜沸騰遷移に関する研究 : 第3報, 気泡付着状態の観察

概要

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Premature transition to film boiling of R113 subjected to stepwise heating at atmospheric pressure is investigated using a transparent ITO film heater made by evaporation onto a glass substrate. The film simultaneously provides surface temperature measurement and permits viewing of the contact area of boiling bubbles from the underside of the heating surface. The ratio of the contact area of bubbles to the area of the heating surface increases to 100% just after boiling incipience, since an initial bubble appearing at a high wall superheat of around 90 K grows quickly along the heating surface and covers it. The contact area ratio is much higher than that in steady-state nucleate boiling throughout the boling duration from the departure of the initial bubble to the transition to film boiling. A dry area appears during the growth of the initial bubble. The occurrence of the dry area, which can be observed even at a low heat generation rate, may be mainly due to the self-evaporation of highly superheated liquid.
一般社団法人日本機械学会の論文
1997-05-25