Experimental study on dynamic characteristics of bubble collapse around vertical boundary to buoyancy
ZHOU Taoran1, CUI Jie2, LI Zichao2, LIU Hongchi2, CHEN Zhipeng2
1.Shipbuilding Technology Research Institute,Shanghai 200032,China;
2. School of Naval Architecture and Offshore Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China
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.
周陶然1,崔杰2,李子超2,刘洪池2,陈志鹏2. 计及浮力影响的竖直刚性边界附近气泡溃灭动力学特性实验研究[J]. 振动与冲击, 2020, 39(20): 258-265.
ZHOU Taoran1, CUI Jie2, LI Zichao2, LIU Hongchi2, CHEN Zhipeng2. Experimental study on dynamic characteristics of bubble collapse around vertical boundary to buoyancy. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(20): 258-265.
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