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首页> 外文期刊>International Journal of Heat and Mass Transfer >Microscale heat transfer measurements during pool boiling of FC-72: effect of subcooling
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Microscale heat transfer measurements during pool boiling of FC-72: effect of subcooling

机译：FC-72池沸腾过程中的微量传热测量：过冷的影响

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摘要

Heat transfer under nucleating bubbles were directly measured using a microheater array with 100 μm resolution with low and high subcooled bulk liquid along with images from below and from the side. The individual bubble departure diameter and energy transfer were larger with low subcooling but the departure frequency increased at high subcooling, resulting in higher overall heat transfer. The bubble growth for both subcoolings was primarily due to energy transfer from the superheated liquid layer-relatively little was due to wall heat transfer during the bubble growth process. Oscillating bubbles and sliding bubbles were also observed in highly subcooled boiling. Transient conduction and/or microconvection was the dominant heat transfer mechanism in the above cases. A description of the experimental setup, the results, and implications for modeling boiling heat transfer are presented. A transient conduction model is developed and compared with the experimental data.
机译：使用具有低和高过冷本体液体的分辨率为100μm的微加热器阵列直接测量成核气泡下的传热，以及来自下方和侧面的图像。在低过冷度下，单个气泡的离开直径和能量传递较大，但是在高过冷度下，离开频率增加，从而导致更高的整体热传递。两种过冷的气泡增长主要是由于来自过热液体层的能量传递，而相对而言很少是由于气泡生长过程中的壁热传递。在高度过冷的沸腾中也观察到振荡气泡和滑动气泡。在上述情况下，瞬态传导和/或微对流是主要的传热机制。介绍了实验设置，结果以及对沸腾传热建模的说明。建立了瞬态传导模型，并将其与实验数据进行了比较。

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