Evaporation and boiling in narrow gap
Evaporation and boiling in narrow gap
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狭缝蒸发、沸腾
DOI：
10.1016/j.applthermaleng.2017.04.035
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发表时间：
2017
影响因子：
6.4
通讯作者：
Yasumoto Yuichi
中科院分区：
文献类型：
--
作者：
Matsumoto Mitsuhiro;Ogawa Keita;Yasumoto Yuichi
为了研究液浸层合板的溶剂蒸汽清洗过程，进行了固体板间液体的可视化实验。乙醇被用作测试液体，其被夹在真空室中的水平放置的玻璃板之间，真空室在室温下具有通常为3kPa的减压。当板被夹紧时，蒸发从板边缘进行，并出现复杂的分支模式，偶尔出现液体前沿的快速运动。为了更详细地研究这种准二维闪急沸腾，我们进行了类似的实验与非夹紧板。在早期阶段，观察到顶板的几个孤立的跳跃，这对应于闪急沸腾。粗略的能量分析表明闪急沸腾对整个蒸发过程的贡献是有限的。随着蒸发的进行，跳跃转变为规则的振荡，这可以用蒸汽的不完全冷凝来解释。这些孤立的跳跃和振荡的行为强烈地受到表面粗糙度和溶解气体的影响。
In order to investigate a washing process of liquid-immersed laminated plates with solvent vapor, we have done visualization experiments of liquid confined between solid plates. Ethanol is used as test liquid, which is sandwiched between horizontally placed glass plates in a vacuum chamber with a reduced pressure of typically 3 kPa at room temperature. When the plates are clamped, evaporation proceeds from the plate edges and complicated branching patterns appear with occasional rapid motions of liquid front. To study this quasi two-dimensional flash boiling in more detail, we carried out similar experiments with unclamped plates. At the earlier stage, several isolated jumps of the top plate were observed, which correspond to the flash boiling. Rough energetic analysis indicates that the flash boiling has only a limited contribution to the whole evaporation process. As the evaporation proceeds, jumps change into regular oscillations, which can be explained by incomplete condensation of vapor. These behaviors of isolated jumps and oscillations are strongly affected by surface roughness and dissolved gas.