Microlayer evaporation during steam bubble growth
Microlayer evaporation during steam bubble growth
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DOI：
10.1016/j.ijthermalsci.2018.11.012
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发表时间：
2019-03
影响因子：
4.5
通讯作者：
G. Giustini;Satbyoul Jung;Hyungdae Kim;Keith H. Ardron-;S. Walker
中科院分区：
文献类型：
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作者：
G. Giustini;Satbyoul Jung;Hyungdae Kim;Keith H. Ardron-;S. Walker
本文分析了在加热表面生长的蒸汽泡下微层的蒸发情况。利用光学测量其厚度和红外测量气泡下固体表面温度，已经评估了微层损耗率和相关的蒸发热通量。从分子的角度模拟了液膜的损耗，并试图与测量结果进行比较。本文研究了一种基于简单动力学理论的蒸发模型，该模型表示撞击和从液体表面发射的分子通量。由此，有力地支持了只有一小部分撞击的蒸汽分子被液体表面吸收的假设。测量结果表明，“调节系数”的值约为0.03，相应的“有效蒸发传热系数”与其他工人的估计值相当一致。
This paper presents analysis of the evaporation of the microlayer beneath a steam bubble growing at a heated surface. The microlayer depletion rate, and the associated evaporative heat flux, have been assessed using optical measurements of its thickness, and infrared measurements of the temperature of the solid surface beneath the bubble. Depletion of the liquid film is modelled from a molecular point of view, and comparison with measurements is attempted. A model of evaporation based on a simple kinetic theory representation of the molecular fluxes impinging on and emitted from a liquid surface is studied. From this, strong support is obtained for the hypothesis that only a fraction of impinging vapour molecules are absorbed by a liquid surface. The measurements suggest a value for the ‘accommodation coefficient’, of approximately 0.03 and a corresponding ‘effective evaporative heat transfer coefficient’, that are reasonably consistent with estimates from other workers.