Study of Boiling Characteristic Curves in Subcooled Pool Boiling of Water (4th Report, The Mechanism of Heat Transfer in Transition Boiling)

概要

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Pool boiling experiments were conducted on a 10 mm dia. heated surface facing upwards in the range of subcooling from 15 to 50K at atmospheric pressure. The heat transfer mechanism in the transitional boiling region can be estimated by a mathematical model based on the mass transfer mechanism of evaporation and condensation through a coalescent vapor bubble. The changes with time of the mass flux of condensation and the dried area on the heated surface, which are important factors governing the characteristics of transition boiling heat transfer, are estimated by a model based on this mass transfer mechanism. An explanation was obtained on the mechanism of liquid invasion onto the heated surface from the correspondence between the change with time of the dried area and local temperature fluctuations of the heated surface.
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