Crown control in a pair of cavitation bubbles close to a free surface: A numerical study
物理
空化
机械
曲面(拓扑)
自由面
经典力学
几何学
数学
作者
Pengbo Bai,Jingzhu Wang,Guanghang Wang,Yiwei Wang
出处
期刊:Physics of Fluids [American Institute of Physics] 日期:2024-10-01卷期号:36 (10)被引量:2
标识
DOI:10.1063/5.0226207
摘要
When a cavitation bubble re-expands near the surface of a liquid, an axisymmetric crown forms around the jet that is initially produced. Controlling this crown is essential if the first jet is to be used in engineering applications such as laser-induced transfer (LIT). Herein, we introduce a second cavitation bubble to control the formation and growth of the crown. Numerical simulations were performed using the compressibleInterIsoFoam solver within the open-source platform OpenFOAM, incorporating a geometric volume-of-fluid approach for tracking interfaces. Detailed analysis showed that a reversal in curvature across the concave interface indicates the moment of crown formation, and this is induced by flow focusing during bubble contraction or momentum transfer from a second expansion. In the presence of the second bubble, the crown type can be classified as either enhanced or inhibited in comparison with a single-bubble scenario. The velocity of crown formation, vcf, is defined to describe the crown type, and a parametric study of crown types was conducted based on the dimensionless stand-off distances, γ1 and γ2. The findings of this study offer new insights into the field of LIT.