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Complex behavior very close to the pinching of a liquid free surface

M. Rubio1, A. Ponce-Torres1, E. J. Vega1, M. A. Herrada2, and J. M. Montanero1

  • 1Departamento de Ingeniería Mecánica, Energética y de los Materiales and Instituto de Computación Científica Avanzada (ICCAEx), Universidad de Extremadura, E-06006 Badajoz, Spain
  • 2Departamento de Mecánica de Fluidos e Ingeniería Aeroespacial, Universidad de Sevilla, E-41092 Sevilla, Spain

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Phys. Rev. Fluids 4, 021602(R) – Published 19 February, 2019

DOI: https://doi.org/10.1103/PhysRevFluids.4.021602

Abstract

We determine experimentally, with an unprecedented spatiotemporal resolution, the evolution of the liquid free surface during the pinching of a pendant droplet. We observe the transition from the inertio-capillary regime to the inertio-viscous-capillary final stage for a low viscosity liquid. Experiments with 5-cSt silicone oil show the formation of a micrometer subsatellite droplet in the vicinity of the pinching region. This phenomenon does not occur for a glycerine-water mixture with the same Ohnesorge number, which indicates the existence of complex effects during the breakup of the silicone oil droplet. The comparison between the experimental results and numerical simulations of the full Navier-Stokes equations shows that experiments deviate from the Newtonian theoretical predictions when the subsatellite droplet forms. Viscoelasticity might explain that deviation.

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Phys. Rev. Fluids 4, 021602(R)– Published 19 February, 2019
  • Received 22 October 2018
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