气泡生长及脱离过程中下边缘的迁移行为

发布时间：2018-06-07 16:32

  本文选题：气液反应器 + 气泡生长　； 参考：《东北大学学报(自然科学版)》2017年08期

【摘要】：基于高速摄像技术记录静止液体中气泡生长及脱离过程,并采用Image-Pro Plus 6.0软件进行后处理,研究了两种管径下气泡生长过程的形状变化.实验结果表明:由于不同管径下气泡生长过程中起主导的作用力不同,导致小管径生成气泡的高宽比随时间变化呈先陡后缓的上升趋势,大管径生成气泡的高宽比随时间变化呈先缓后陡的上升趋势;由于生长前期不满足脱离条件,小管径生成的气泡会出现下边缘向液体侧迁移的现象;大管径生成的气泡在气液面与固液面夹角小于接触角时即达到脱离条件,因此不会出现迁移;3.80 mm气泡脱离上浮的临界高宽比稍大于9.28 mm气泡相应值.
[Abstract]:Based on the high speed camera technique, the bubble growth and separation process in the stationary liquid is recorded and the shape changes of the bubble growth process under two tubes are studied by Image-Pro Plus 6 software. The results show that the small diameter of the bubble is caused by the difference of the main leading force in the process of bubble growth under different pipe diameters. The ratio of height to width will rise steeply and later with time, and the height width ratio of the large diameter of the gas bubble increases first and then abruptly with the change of time. As the early growth stage does not meet the separation condition, the bubbles generated by the small tube diameter will appear to the liquid side of the lower edge, and the bubbles generated by the large pipe diameter are in the angle between the gas level and the solid liquid surface. When the contact angle is less than the contact angle, the separation condition will be achieved, so there will be no migration. The critical height width ratio of the 3.80 mm bubble floating off is slightly larger than that of the 9.28 mm bubble.
【作者单位】： 东北大学材料电磁过程研究教育部重点实验室;东北大学冶金学院;
【基金】：国家自然科学基金资助项目(51304038) 国家自然科学基金与宝钢联合资助项目(U1460108) 中国博士后科学基金特别资助项目(2015T80261)
【分类号】：O359.1
，

本文编号：1991837