Single cavitation bubble dynamics induced by laser-generated plasma near a biomimetic mesotextured boundary

In this study, we directly monitored the collapse dynamics of a single cavitation bubble induced by laser-generated plasma near a biomimetic mesotextured boundary placed in distilled water via the shadowgraphy technique. Comparing the single cavitation bubble mechanism near a plain solid surface with the one near the biomimetic mesotextured surface allowed to investigate the effects of the biomimetic mesotextured surface on the control of the single bubble collapse dynamics at various relative wall distances. The results show that the microjet toward the plain surface during the first collapse of the bubble is manipulated when the biomimetic mesotextured surface is replaced. No substantial impact of the bubble collapse on the biomimetic boundary was observed. This results from the fact that the microjet was mitigated during the first stage of the bubble collapse. Moreover, in the second phase of the bubble collapse, no toroidal structures attached on the wall surface of the biomimetic mesotextured boundary are formed at different relative wall distances. In addition, first and second bubble collapse stages near the modified boundary happened earlier than the first and second bubble collapses near the plain surface at most relative wall distances. Furthermore, the equivalent bubble radius for the bubble near the biomimetic boundary was mitigated compared to the equivalent bubble radius for the bubble near the plain boundary at most relative wall distances.