Abstract
Transition boiling heat transfer is studied by carrying out an experiment on steady pool boiling of water under atmospheric pressure and saturated condition on a horizontal copper disc 10 mm in diameter. Bubble (vapor mass) departure diameter and frequency were measured using high-speed video movies and an impedance probe, and they are well correlated as a function of heat flux. It is found that in transition boiling, heat transfer characteristics at low and at high wall superheats are considerably different. The macrolayer evaporation model, which was first proposed by Katto and Yokoya in 1970, is revised on the basis of nucleation heat flux previously measured by the authors to explain the transition boiling heat transfer at low wall superheat.
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