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加热面边界条件对MEB形成过程的影响

DOI: 10.3969/j.issn.1006-7043.201307066

Keywords: 气泡微细化沸腾, 下沉加热面, 气泡行为, Marangoni对流, 冷凝

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Abstract:

为研究加热面周围边界条件对气泡微细化沸腾的影响, 结合实验与数值模拟对加热面低于水箱底面0.5 mm以及与之齐平两种条件下加热面上气泡行为和气泡周围流场进行对比分析。实验结果表明, 50 K过冷度下, 加热面齐平时, 会发生旺盛的MEB现象, 而对于加热面下沉时, 微细化沸腾现象不发生。数值分析表明, 加热面下沉时, 气泡周围Marangoni对流被减弱, 且气泡顶部的冷凝被大幅削减。这使得气泡稳定地在加热面上形成并逐渐长大, 无法形成微细化沸腾现象。因此, 气膜周围的Marangoni对流和气液界面上的冷凝过程可能是导致微细化沸腾发生的主要原因。

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