Conference Proceedings Paper
Numerical Prediction on Subcooled Boiling Bubble Behavior
NURETH-14 - 2011 September 25-30
Yasuo Ose (Kyoto University)
Tomoaki Kunugi (Kyoto University)
This study focuses on the subcooled pool boiling. Since the subcooled pool boiling is occurred under a condition below the saturation temperature, it is the most complex phenomenon consisted of the bubble growth, condensation and extinction processes with phase-change phenomena: evaporation and condensation. Although the subcooled boiling is very important phenomena, the essential mechanism has not yet been clarified until now because the bubble nucleation and growth processes are too fast to observe even by means of a very high-speed camera. Another approach to understand these processes is a numerical simulation. In this study, in order to clarify the heat transfer characteristics of the subcooled pool boiling and to discuss its mechanism, a boiling and condensation model for numerical simulation on subcooled boiling phenomena has been developed. In this paper, the three dimensional numerical simulations based on the MARS (Multi-interface Advection and Reconstruction Solver) with the boiling and condensation model consisted of the improved phase-change model and an introduction of the relaxation time based on the quasi-thermal equilibrium state have been conducted for the subcooled pool boiling phenomena especially regarding to the bubble departure behavior from the heated surface. The results of the numerical simulations were compared with the experimental data obtained by the high-speed camera (Phantom 7.1) with the Cassegrain optical system, and then the influence of the degree of subcooling for the bubble departure and the heat transfer on the heated surface were numerically predicted. As the results, the numerical results of bubble departure behavior from the heated surface showed in good agreement with the experimental observations quantitatively.
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