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von Kármán Vortex Street within an Impacting Drop

Marie-Jean Thoraval, Kohsei Takehara, Takeharu Goji Etoh, Stéphane Popinet, Pascal Ray, Christophe Josserand, Stéphane Zaleski, and Sigurdur T. Thoroddsen
Phys. Rev. Lett. 108, 264506 – Published 29 June 2012
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Abstract

The splashing of a drop impacting onto a liquid pool produces a range of different sized microdroplets. At high impact velocities, the most significant source of these droplets is a thin liquid jet emerging at the start of the impact from the neck that connects the drop to the pool. We use ultrahigh-speed video imaging in combination with high-resolution numerical simulations to show how this ejecta gives way to irregular splashing. At higher Reynolds numbers, its base becomes unstable, shedding vortex rings into the liquid from the free surface in an axisymmetric von Kármán vortex street, thus breaking the ejecta sheet as it forms.

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  • Received 11 February 2012

DOI:https://doi.org/10.1103/PhysRevLett.108.264506

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

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Unexpected Turbulence in a Splash

Published 29 June 2012

Some droplets throw out a fine spray as they hit a liquid surface because of a hidden pattern of fluid flow.

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Authors & Affiliations

Marie-Jean Thoraval1, Kohsei Takehara2, Takeharu Goji Etoh2, Stéphane Popinet3, Pascal Ray4, Christophe Josserand4, Stéphane Zaleski4, and Sigurdur T. Thoroddsen1,*

  • 1Division of Physical Sciences and Engineering & Clean Combustion Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
  • 2Department of Civil and Environmental Engineering, Kinki University, Higashi-Osaka, Japan
  • 3National Institute of Water and Atmospheric Research, Kilbirnie, Wellington 6003, New Zealand
  • 4Institut Jean Le Rond D’Alembert, UMR 7190, Université Pierre et Marie Curie, Paris, France

  • *sigurdur.thoroddsen@kaust.edu.sa

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Issue

Vol. 108, Iss. 26 — 29 June 2012

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