Abstract
A coupled level set and volume-of-fraction method is applied to investigate the impact of an oil droplet on an oil film containing a bubble. Subsequently, the deformation of the bubble is analyzed. Simulation results show two different movement forms of bubbles after an oil droplet impacts an oil film under different impacting velocities: stable deformation and bubble breaks. Bubble breaks originate from the combined action of surface tension and viscous shear force. Oil film thickness also affects bubble deformation. As the film thickness decreases, the deformation quantity of bubbles increases. Thus, bubbles are easily broken. This study provides a basic guide for bubble dynamics when a droplet impacts a film.
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