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Interfacial bubbles formed by plunging thin liquid films in a pool

Abstract : We show that the immersion of an horizontally-suspended thin film of liquid in a pool of the same fluid creates an interfacial bubble, that is, a bubble at the liquid-air interface. Varying the fluid properties, the film's size and its immersion velocity, our experiments unveil two formation regimes characterized by either a visco-capillary or an inertio-capillary mechanism that controls the size of a produced bubble. To rationalize these results, we compare the pressure exerted by the air flow under a plunging film with the Laplace pressure needed to generate film dimpling, which subsequently yields air entrapment and the production of a bubble. This physical model explains the power-law variations of the bubble size with the governing dimensionless number for each regime.
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Submitted on : Tuesday, June 27, 2017 - 12:04:06 PM
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Louis Salkin, Alexandre Schmit, Richard David, Alexandre Delvert, Eric Gicquel, et al.. Interfacial bubbles formed by plunging thin liquid films in a pool. Physical Review Fluids, American Physical Society, 2017, 2 (6), pp.063604. ⟨10.1103/PhysRevFluids.2.063604⟩. ⟨hal-01548219⟩



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