Details of the Collapse of a Cavitation Bubble Next to a Flat, Rigid Wall


A detailed numerical study of a single laser-induced cavitation bubble that is generated next to a flat, solid wall under normal ambient conditions is presented. For the numerical simulation a compressible two-phase solver of the finite volume software package OpenFOAM has been adapted for our purpose. Bubbles with an initial normalized distance γ from the wall in the range γ ∈ [1.02, 1.5] are simulated. The investigation focuses on the dynamics of the liquid-on-liquid impact of the micro-jet, the splitting of the resulting torus bubble into several ring-like bubbles and their subsequent collapse. Details of the dynamics of the bubble at and after jet-impact, including the formation of an annular sheet-like “nano-jet” are presented. Pressure waves emanating from jetimpact and collapse are described. The influence of the initial distance from the wall on the above described phenomena is investigated. In particular, jet velocities and the maximum pressure at jet-impact are given for this range of normalized distances.

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