Droplet impact on a liquid pool: air bubble entrainment

ORAL

Abstract

A range of spectacular phenomena result from impacts of droplets on the surface of a liquid pool, such as splashing, bubble entrapment, or droplet bouncing off from the surface. Here we provide experimental results on the dynamics that precede these striking events, in particular on the entrapment process of an air bubble between the impacting droplet and the pool's surface. We focus on the impact dynamics at early time with an emphasis on the air layer from its formation to its rupture. We identify the dependence of the rupture position on the liquid viscosity and the impact velocity. We show that the volume of the entrapped air under impacting droplets can be related to both that of impacting droplets on solid surfaces and that of impacting rigid spheres on liquid surfaces.

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Authors

  • Tuan Tran

    University of Twente, The Netherlands, University of Twente, Enschede, The Netherlands

  • Helene de Maleprade

    Ecole Polytechnique, Paris, France

  • Chao Sun

    University of Twente, Physics of Fluids group, University of Twente, Netherlands, Universiteit Twente, University of Twente, Physics of Fluids Group, University of Twente, Enschede, The Netherlands, Physics of Fluids Group, University of Twente, The Netherlands

  • Detlef Lohse

    University of Twente, Physics of Fluids, University of Twente, Enschede, Physics of Fluids, University of Twente, Physics of Fluids group, University of Twente, Netherlands, Universiteit Twente, University of Twente, Physics of Fluids Group, University of Twente, Enschede, The Netherlands, Physics of Fluids Group, Faculty of Science and Technology, J.M. Burgers Center for Fluid Dynamics, and IMPACT Institute, University of Twente, NL, Physics of Fluids Group, University of Twente, The Netherlands