鉛直下降流における限界熱流束時の液膜流量評価

抄録

Since the downward flow becomes unstable as compared with the upward flow, the condition for the critical heat flux becomes very complicated. In this investigation, the liquid film amount at the critical heat flux condition was evaluated by using the liquid film extraction method. Experiments were carried out with several test sections with different heating lengths. As results the modified correlations of Koizuimi was proposed, and it can estimate the residual amount of the liquid film at the dry out condition in wide range. Although this correlation can explain the qualitative tendency well, the quantitative difference still exists. It might be the fundamental difference of flow structure between upward and downward flows.