首页|Jetting of a near-wall cavitation bubble induced by another tandem bubble
Jetting of a near-wall cavitation bubble induced by another tandem bubble
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Double bubbles near a rigid wall surface collapse to produce a significant jet impact,with potential applications in surface cleaning and ultrasonic lithotripsy.However,the dynamic behaviors of near-wall bubbles remain unexplored.In this study,we investigate the jetting of a near-wall bubble induced by another tandem bubble.We define two dimensionless standoff distances,y1,γ2,to represent the distances from the center of the near-wall bubble to the rigid wall and the center of controlling bubble to the center of the near-wall bubble,respectively.Our observations reveal three distinct jetting regimes for the near-wall bubble:transferred jetting,double jetting,and directed jetting.To further investigate the jetting mechanism,numerical simulations are conducted using the compressibleInterFoam solver in the open-source framework of OpenFOAM.A detailed analysis shows that the transferred jet flow is caused by the pinch-off resulting from the axial contraction velocity at the lower end of the near-wall bubble being greater than the vertical contraction velocity,leading to a maximum jet velocity of 682.58 m/s.In the case of double jetting,intense stretching between the controlling bubble and the wall leads to a pinch-off and a double jetting with a maximum velocity of 1 096.29 m/s.The directed jet flow is caused by the downward movement of the high-pressure region generated by the premature collapse of the controlling bubble,with the maximum jet velocitv reaching 444.62 m/s.
Jetting of near-wall bubblecontrolling bubbleimpact velocity
Hui Han、Jing-zhu Wang、Jian-lin Huang、Peng-bo Bai、Yong-gang Chen、Yi-wei Wang
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Key Laboratory for Mechanics in Fluid Solid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China
School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China
Guangdong Aerospace Research Academy,Guangzhou 511458,China
School of Future Technology,University of Chinese Academy of Sciences,Beijing 100049,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaYouth Innovation Promotion Association,Chinese Academy of Sciences
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