Abstract
The high heat flux region near the burnout heat flux has recently been utilized not only in the nuclear power plant and the boiler system but also in the electrical and laser equipments. Since the mechanisms of the burnout heat flux modeled so far has some unclear aspects in predicting the dynamics behavior of thin liquid films under the boiling bubbles, the thickness of the boiling bubbles has been challenged to measure in this paper. To measure the thickness of the liquid film on the heat transfer surface under the boiling bubble, a capacitance probe has been newly devised. The thickness of the thin liquid film under the boiling bubble was obtained, and the relationship between the bubble shape around the bottom rim and the thickness of the thin liquid film under the bubbles (micro layer) was clarified for predicting the critical heat flux mechanism.
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