Effect of inclination angle of heating surface on bubble growth-condensation behavior during subcooled flow boiling

doi:10.3969/j.issn.0438-1157.2013.05.011

Abstract

Abstract: By using a high speed camera, the bubble growth-condensation behavior under subcooled flow boiling in an inclined single-side heated rectangular channel was investigated experimentally.The influences of inclination angle on growth-condensation rate of bubbles, their distribution, maximum diameter and growth time were discussed.The results show that with same inlet parameters, the bubble maximum size and lifetime are proportional to the inclination angle; for different angles, the bubble size and growth time follow the 0.5 power law.In dimensionless form of Zuber model, in the growth region, the growth rate increases with increasing angle, but in the condensation region, there is no obvious relationship between the condensation rate and inclination angles.

Key words: subcooled flow boiling, growth-condensation rate, inclination angle, rectangular channel

摘要： 采用高速摄影的方式,对矩形通道内过冷沸腾时的汽泡在倾斜状态下的行为进行了可视化研究,分析了加热面倾斜角度对汽泡生长-冷凝速率以及平均汽泡最大直径与对应生长时间的影响。结果表明:在同一入口工况参数下,汽泡的最大直径与寿期均随角度的增加而上升,且与倾斜角度近似呈正比;不同倾斜条件下的汽泡最大直径与对应生长时间基本满足0.5次幂的函数关系,其系数与倾斜角度呈正比;采用Zuber量纲1形式表示后,不同倾角时的平均汽泡生长-冷凝曲线在生长阶段随倾角增加而增加,而在冷凝阶段则与角度无明显关联。

关键词: 过冷沸腾, 生长-冷凝速率, 倾斜角, 矩形通道

CLC Number:

TL33

XU Chao, GAO Puzhen, LI Shaodan, GAO Feng. Effect of inclination angle of heating surface on bubble growth-condensation behavior during subcooled flow boiling[J]. CIESC Journal, 2013, 64(5): 1580-1585.

许超, 高璞珍, 李少丹, 高风. 加热面倾斜角对过冷沸腾中汽泡生长-冷凝行为的影响[J]. 化工学报, 2013, 64(5): 1580-1585.

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