A Review of the Dynamics Progress of Bubble Collapse within Droplet and Droplet Splash

The dynamics of a cavitation bubble within a droplet is one of the hot research topics at present. The present paper summarizes the research progress of bubble collapse within droplets and associated droplet splash. Firstly, three typical structures of bubble collapse are introduced, together with the collapsing shock waves and the distribution of collapsing forces. Secondly, several typical forms of droplet splash are shown in terms of splash speed, splash direction, and dynamic mechanisms. Finally, the unsolved problems in the field of cavitation bubbles within droplets are proposed with perspectives.