[2I06-11] Phase Change

[2I11] Study on dependency of pressure on boiling behavior on vertical heating surface in pool boiling

*Ayako Ono¹, Shinichiro Uesawa¹, Mitsuhiko Shibata¹, Hiroyuki Yoshida¹, Yasuo Koizumi¹ (1. Japan Atomic Energy Agency)

Keywords:Critical heat flux, High pressure, Bubble behavior, Bubble coalescence, Pool boiling

The boiling behavior was observed up to under 2MPa condition by high-speed camera, where was on the vertical surface in pool boiling, in order to grasp the mechanism of boiling including the bubble coalescence behavior and establish the model to predict the critical heat flux (CHF) under the high pressure condition. From these observations, the differences on the boiling behavior between under the atmospheric condition and higher pressure conditions were pointed out, and the phenomena and parameters to consider under the high pressure condition were considered in order to establish the CHF which was applicable to various pressure conditions.