Title: BUBBLE GROWTH RATES IN HIGHLY SUBCOOLED NUCLEATE BOILING
Abstract: By comparison of the Rayleigh solution for bubble growth and collapse with experimental data, it is found that the pressure of the vapor within bubbles arising in very subcooled nucleate boiling is less by a small, fairly constant amount than the pressure at a great distance. The effect is the same as if the bubble surroundings were imparted an initial impulse while the minute bubble was still entirely within the laminar-wall layer. The kinetic energy imparted by this initial impulse and the restraining pressure difference determine the bubble trajectory. These parameters are computed for Gunther's data. It is then postulated that the heat flux from the portion of the bubble projecting into the turbulently-flowing core depends primarily upon turbulent and convective heat flow rather than laminar heat conduction and hence is relatively constant during the bubble lifetime. The proposed mechanism gives qualitative agreement with the observed trends. It is suggested that latent heat transport may be an important mode of heat transfer in subcooled nucleate boiling. (auth)
Publication Year: 1959
Publication Date: 1959-01-01
Language: en
Type: article
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Cited By Count: 16
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