Experimental study of single bubble rising near vertical wall in hele-shaw cell

被引：6
作者：
Xiang, Shiping [1 ]
Jian, Zhen [1 ]
Kherbeche, Abderrahmane [2 ]
Thoraval, Marie-Jean [1 ]
机构：
[1] Xian Fiaotong Univ, Int Ctr Appl Mech, Sch Aerosp Engn, Dept Engn Mech,State Key Lab Strength & Vibrat Me, Xian 710049, Peoples R China
[2] Univ Paris Est, UPEM, Lab Geomat & Environm EA 4508, F-77454 Marne La Vallee, France
来源：
CHEMICAL ENGINEERING SCIENCE | 2022年 / 255卷
基金：
中国国家自然科学基金;
关键词：
Bubble; Hele-Shaw cell; Wall; Vortex von Karman; Flow structure; AIR BUBBLES; MOTION; MIGRATION; DYNAMICS; BODIES; FORCES; MODEL; FLUID; RISE; PATH;
D O I：
10.1016/j.ces.2022.117647
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
A confined single air bubble rising near a vertical wall in a 2D Hele-Shaw cell was investigated experimentally with high-speed imaging. Wall effect was studied by varying the initial distance between the wall and the capillary needle to release the bubble, comparing to a confined-rising bubble without wall. The bubble of diameter of 3.65 mm rises first in a vertical path, then changes to zigzag and migrates away from the wall. Characteristics of the rising bubble were analyzed. Force balance equations considering added-mass effect were proposed to calculate forces on the bubble. With a rheoscopic fluid, clear wake structure is observed. A single threaded wake is formed once released, then a symmetric vortex pair is attached to the bubble. Vortex shedding triggers zigzag and a Karman vortex street is eventually generated. The presence of the wall provokes earlier zigzagging and complicated wake structure in the near wall area.(c) 2022 Elsevier Ltd. All rights reserved.
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页数：11
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