自然対流膜沸騰熱伝達に関する研究 : 第4報, 長い蒸気膜を有するサプクール膜沸騰に関する実験

概要

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Heat transfer in natural-convection film boiling with long vapor film is investigated experimentally. Experiments of film boiling on horizontal cylinders of large diameter and long vertical cylinders are conducted to investigate the effect of liquid subcooling on film-boiling heat transfer. The test liquid is R-113 at atmospheric pressure. For cylinders of both types, local heat transfer coefficients of saturated and subcooled film boiling are much higher than the predictions from two-phase boundary layer theory. In the case of vertical cylinders, local heat transfer coefficients do not depend on the distance from the stagnation point even if the liquid is subcooled. In the case of horizontal cylinders of large diameter, the local value of saturated film boiling dose not strongly depend on the distance from the stagnation point, but it comes to depend on the distance with increasing subcooling. In particular, the local value reaches a maximum at a distance from the stagnation point. As for averaged heat transfer coefficients of horizontal cylinders of large diameter, they increase with increasing subcooling but do not depend on the diameter even under subcooled conditions.
一般社団法人日本機械学会の論文
1992-03-25