Interaction of cavitation bubbles with the interface of two immiscible fluids on multiple time scales

We experimentally, numerically and theoretically investigate the nonlinear interaction between a cavitation bubble interface of two immiscible fluids (oil water) on multiple time scales. The underwater electric discharge method is utilized to generate near or at interface. Both dynamics short scale evolution much longer are recorded via high-speed photography. Two mechanisms found contribute fluid mixing in our system. First, when initiated oil phase interface, an inertia-dominated liquid jet generated from collapsing penetrates water–oil consequently transports fine droplets into water. critical standoff parameter for penetration be highly dependent density ratio fluids. Furthermore, pinch-off produced long after stage reckoned as second mechanism, carrying water bulk. dependence jetting behaviours governing parameters systematically studied experiments boundary integral simulations. Particularly, we quantitatively demonstrate respective roles surface tension viscosity dynamics. As extended Rayleigh–Plesset model proposed that well predicts asymmetric bubble, which accounts faster contraction top downward jet.