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초록·키워드
In this study, experiments on the pool boiling of saturated liquid nitrogen in a small cylindrical pool were conducted, and the film boiling heat transfer for different pool depths was observed. Test surface made of stainless steel was set horizontally upward. The test surface was heated up to approximately 250℃ by an infrared heater, after that it was cooled down by liquid nitrogen. Temperature history was measured using three thermocouples, and based on the measured temperature history, the surface temperature and heat flux were calculated by solving numerically the inverse heat conduction problem. The experimental results showed that the heat flux decreased slightly with an increased depth of the cylindrical pool in the film boiling region. This was thought to be due to the increase in the relative area occupied by the bubbles on the heat transfer surface. However, the effect of the pool depth on film boiling heat flux is not significant and the film boiling heat flux in the small cylindrical pool can be predicted from the correlations of the previous study.
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