Jet dynamics induced by the interaction of two cavitation bubbles near a particle

The synergistic effects of cavitation erosion and particle abrasion aggravate damage to the overflow components in fluid machinery. To reveal its underlying mechanism, this paper establishes a theoretical model for the interaction of two cavitation bubbles collapsing near a particle and investigates the jet behaviors induced by the bubbles through experiments. Anisotropy parameters are introduced to quantitatively assess the characteristics of the jets, bubble migration, and collapsing time as functions of the relative position and size between the bubbles and the particle. Primary findings are summarized as follows: (1) Bubble collapse produces two distinct jet behaviors, namely, the co-flowing jets toward the particle and the colliding jets. The anisotropy parameter could distinguish the two jet behaviors accurately. (2) An analytical function describing the dominant mechanism of the bubble migration is constructed under the framework of the Kelvin impulse theory. The parameter ranges describing the dominant mechanism of bubble migration intensity are clarified. (3) A power-law function between the dimensionless bubble collapse time and the anisotropy parameter is established, and the prolongation characteristic regarding the bubble's collapse time is quantitatively described.