Analysis of Effect of Marangoni Convection on Formation of Microbubble Emission Boiling
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摘要: 鉴于汽泡微细化沸腾(MEB)极强的传热能力和目前对于MEB的形成机理还不清楚的实际情况之下,利用数值分析方法,对比了马兰哥尼(Marangoni)对流和自然对流过程在MEB形成中的作用。结果表明:Marangoni对流对于汽膜周围流场的影响要远远大于自然对流过程;在40 K过冷度和80 K壁面过热度的条件下,汽膜周边区域Marangoni对流和自然对流的平均速度分别约为0.4 m/s和0.01 m/s,并且随着过冷度或壁面过热度的升高,Mrangoni对流过程加剧。Marangoni对流在MEB现象形成及传热过程强化等过程中起到了关键作用。
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关键词:
- 数值模拟 /
- 微汽泡发射沸腾 /
- Marangoni对流 /
- 表面张力
Abstract: In view of the extremely high heat transfer capability of Microbubble Emission Boiling（MEB） and the situation of unknown to its formation mechanism,a numerical investigation was carried out to compare the effects of Marangoni and buoyancy convection on the formation of MEB.This can also help researchers to understand the mechanism of the phenomenon of MEB.It is indicated that Marangoni convection has a much higher effect than the natural convection in the region around the vapor film.At subcooling of 40 K and wall superheating of 80 K,the average velocities caused by Marangoni effect and gravity are 0.4 m/s and 0.01 m/s,respectively.All of these indicated that Marangoni convection plays a key role in triggering MEB and enhancing the heat transfer process involved. -
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