Jetting of a near-wall cavitation bubble induced by another tandem bubble  

作　　者：Hui Han Jing-zhu Wang Jian-lin Huang Peng-bo Bai Yong-gang Chen Yi-wei Wang 

机构地区：[1]Key Laboratory for Mechanics in Fluid Solid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing,100190,China [2]School of Engineering Science,University of Chinese Academy of Sciences,Beijing,100049,China [3]Guangdong Aerospace Research Academy,Guangzhou,511458,China [4]School of Future Technology,University of Chinese Academy of Sciences,Beijing,100049,China [5]Jianghuai Advance Technology Center,Hefei,230088,China

出　　处：《Journal of Hydrodynamics》2024年第3期444-456,共13页水动力学研究与进展B辑（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12293003,12272382,12122214,12293000 and 12293004);the Youth Innovation Promotion Association,Chinese Academy of Sciences(Grant No.2022019).

摘　　要：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,γ_(1),γ_(2),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 1096.29 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 velocity reaching 444.62 m/s.

关 键 词：Jetting of near-wall bubble controlling bubble impact velocity 

分 类 号：O35[理学—流体力学]