B213 Visualization Analysis of the Boiling Characteristics during the Water Subcooled Flow Boiling in Low Pressure

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  • B213 低圧時サブクール流動沸騰中における沸騰挙動の可視化解析(OS-01:沸騰・凝縮伝熱および混相流の最近の進展(3))

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In the subcooled flow boiling, bubble size is important in calculating the vaporization rate accurately. On the surface, a number of bubbles that are different size are generated. If the bubble size is assumed to be uniform, a serious error may be caused in the numerical simulation. In this study, considering bubble size distribution, the bubble size are predicted by the gamma distribution. It was demonstrated that the gamma distribution satisfactorily describes the bubble distribution data. Furthermore, correlations were developed for the dimensionless bubble size and shape parameter to enable accurate prediction of them in the subcooled flow boiling.

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