78th Annual Meeting of the APS Division of Fluid Dynamics (Nov 23 — 25, 2025)

V004: Internal Flow in a Bubble Bursting at an Interface

The internal flow inside a single bubble rising and bursting through an interface is captured by laser-induced fluorescence. The bubble, with Re ≈ 5, Eo ≈ 220, and Mo ≈ 1200, rises in a silicon oil bath (1000 cSt), The gas inside the bubble is seeded with fluorescent dye for laser-induced fluorescence (LIF), and the bubble is recorded using a high-speed camera in two-frame mode, combining shadowgraphy and LIF imaging. Upon reaching the oil-air interface, the bubble forms a cap, and the thin liquid sheet develops instabilities before rupturing. The rupture generates an air jet and associated vortex structures, which are also visualized after the burst.