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We investigate experimentally and theoretically the interactions between acavitation bubble and a hemispherical pendant oil droplet immersed in water. Inexperiments, the cavitation bubble is generated by a focused laser pulse rightbelow the pendant droplet with well-controlled bubble-wall distances andbubble-droplet size ratios. By high-speed imaging, four typical interactionsare observed, namely, oil droplet rupture, water droplet entrapment, oildroplet large deformation, and oil droplet mild deformation. The bubble jettingat the end of collapse and the migration of the bubble centroid areparticularly different in each bubble-droplet interaction. We proposetheoretical models based on the method of images for calculating the Kelvinimpulse and the anisotropy parameter which quantitatively reflects themigration of the bubble centroid at the end of the collapse. Finally, weexplain that a combination of the Weber number and the anisotropy parameterdetermines the regimes of the bubble-droplet interactions.

Interactions of a collapsing laser-induced cavitation bubble with a hemispherical droplet attached to a rigid boundary