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.

引用

页数：11

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