冷媒の水平粗面管内沸騰・蒸発熱伝達の実験

概要

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Experiments were carried out on the forced convective boiling heat transfer of refrigerants HCFC22 and HCFC123 inside a tube whose surface was rougher than that of an ordinary smooth copper tube used commercially as heat transfer tube. The local heat transfer coeffcients were measured in the range of reduced pressure ratio of 0.07 to 0.23 for mass velocity 300kg/(m2s). The measured heat transfer coefficients inside the present tube in annular flow regime are 20-80% higher than those calculated using the authors' previous correlation for an ordinary smooth tube. Once the term representing the nucleate pool boiling heat transfer contribution in this correlation equation is modified by consider the surface roughness effect, the modified equation can correlate the heat transfer coefficients of the present tube within 25% deviations.