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A vortex ring colliding against water surface is visualized. The vortex ring is generated by ejecting a volume of water from a nozzle. As the vortex ring collides against water surface, it generates some secondary vortex rings of opposite rotation to that of the original one. It is observed that collapse of a vortex ring entrains water in a thin layer at water surface into the main water body.

Visualization of Entrainment of a Thin Layer at Water Surface due to Collision of a Vortex Ring