Time lapse images of vortex creation when a drop of dyed water falls through oil into a larger water drop. The drop coalescence is tunable with an electric field.
From the article:
Electrically Tunable Partial Coalescence of Oppositely Charged DropsB. S. Hamlin, J. C. Creasey, and W. D. Ristenpart
Phys. Rev. Lett. 109, 094501 (2012)
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