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ホーム アーカイブ 役員 今後の会合 American Society of Thermal and Fluids Engineering

INVESTIGATION OF WALL SURFACE TEMPERATURE EVALUATION PROCEDURE DURING SUBCOOLED NUCLEATE BOILING IN NON- EMPIRICAL BOILING AND CONDENSATION MODEL

Yasuo Ose
Yamato System Engineer, Co., Ltd., 1-17-1, Wakaba-cho, Hitachi, Ibaraki 317-0063, Japan

Tomoaki Kunugi
Department of Nuclear Engineering, Kyoto University, C3-d2S06, Kyoto Daigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan

DOI: 10.1615/TFESC1.mph.012776
pages 1909-1912


キーワード: boiling and condensation model, wall surface temperature, subcooled nucleate boiling, numerical simulation, phase change phenomena

要約

A non-empirical boiling and condensation model was developed to predict the nucleate boiling bubble behavior and its heat transfer characteristics by means of a direct numerical simulation. This paper described results of an improvement of prediction accuracy on wall surface temperature during the subcooled nucleate boiling in this model. As a validation, two-dimensional axisymmetric numerical simulations of a single bubble nucleate pool boiling under low subcooled condition based on the MARS (Multi-interface Advection and Reconstruction Solver) with this model were performed. The evolutions of wall surface temperature beneath the bubble-base obtained from the simulation were compared to experimental results. In this simulation, because of neglecting the microlayer underneath the bubble-base, the wall surface temperature predicted beneath the growing bubble was higher than that of the experimental results. In order to resolve that discrepancy, the evaluation procedure of the wall surface temperature during the subcooled nucleate boiling in this model has been improved to consider the microlayer evaporation effects underneath the bubble-base without any artificial microlayer model. As a result, the predicted wall surface temperature during the bubble growth period shows the fairly good agreement with the experimental results.

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