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Interfacial bubbles formed by plunging thin liquid films in a pool

Louis Salkin1, Alexandre Schmit1,2, Richard David1, Alexandre Delvert1, Eric Gicquel1, Pascal Panizza1, and Laurent Courbin1

  • 1IPR, UMR CNRS 6251, Campus Beaulieu, Université de Rennes 1, 35042 Rennes, France
  • 2NANO, UR1268, BIA, INRA, rue de la Géraudière, 44316 Nantes, France

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Phys. Rev. Fluids 2, 063604 – Published 20 June, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.063604

Abstract

We show that the immersion of a 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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Phys. Rev. Fluids 2, 063604– Published 20 June, 2017
  • Received 17 November 2016

©2017 American Physical Society

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