Experimental study of a laser induced cavitation bubble near a complex boundary

In the present paper, the dynamics of the bubble near a complex boundary (represented by a series of triangle-type cross sections) are experimentally investigated with the aid of high-speed camera. The cavitation bubble is generated by a focused laser beam and the complex boundary is achieved through high-precision 3D printing technology. A plenty of experiments are carried with the variations of distances between the centre of bubble and the complex boundary, maximum radius of the bubble (adjusted through the energy dissipater) and other paramount parameters. A detailed data analysis is performed with a focus on the effects of the complex boundary on the collapsing phenomenon of bubble. Based on our analysis, the complex boundary could greatly alter the dynamic behaviour of cavitation bubbles especially in terms of the collapse shape of bubble and the jet phenomenon.