Experimental study on dynamic characteristics of bubble collapse around vertical boundary to buoyancy

被引：0
|
作者：
Zhou T. [1 ]
Cui J. [2 ]
Li Z. [2 ]
Liu H. [2 ]
Chen Z. [2 ]
机构：
[1] Shipbuilding Technology Research Institute, Shanghai
[2] School of Naval Architecture and Offshore Engineering, Jiangsu University of Science and Technology, Zhenjiang
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2020年 / 39卷 / 20期
关键词：
Bubble dynamics; Bubble period; Jet; Rigid wall;
D O I：
10.13465/j.cnki.jvs.2020.20.033
中图分类号：
学科分类号：
摘要：
The motion of bubbles is often significantly affected by boundary conditions. There is still a certain amount of energy stored in a near-boundary bubble after the first collapse, and its moving jet can still cause structural damage. Therefore, a related bubble experiment can provide a reference for the determination of the jet direction of the near-field underwater explosion and the damage caused by the secondary pulsation of the bubble. In order to reveal the interaction between the bubbles and the vertical wall, an effective electric spark device was used to generate bubbles under reduced pressure. The expansion, collapse, rebound, re-collapse, and migration of the spark-generated bubbles were recorded by a high-speed camera, and the second pulsation of bubbles was analyzed. The phenomenon depends largely on two dimensionless parameters: dimensionless distance γw from the initial bubble center to the vertical wall and dimensionless parameter δ for the effect of buoyancy. Experiments reveal the dynamic characteristics of bubbles near vertical walls, and the variation laws of wall effect, asymmetric collapse of bubbles and center migration of bubbles with two sensitive parameters were obtained, which provides support for theoretical and numerical studies. It also provides supports for theoretical and numerical research. In addition, the angles of bubble collapse under different conditions were measured, and the obvious change trend was found. Using the controllability of jet angle, a new idea for cleaning rigid surfaces was introduced. © 2020, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：258 / 265
页数：7
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