Flapping instability of a liquid jet

Antoine Delon, Alain Cartellier, and Jean-Philippe Matas
Phys. Rev. Fluids 3, 043901 – Published 6 April 2018
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Abstract

We measure experimentally the frequency of the large-scale instability developing on a liquid jet incompletely atomized by a parallel fast gas stream. We demonstrate that this “flapping instability” can be triggered by different mechanisms: in a first regime it is synchronized with the shear instability developing upstream, provided the wavelength of this shear instability is larger than the liquid jet diameter HL. When the shear instability exhibits wavelengths shorter than HL, a second regime is observed where the flapping instability becomes independent of the gas stream velocity. This second regime is characterized by a constant Strouhal number, provided the Froude number of the jet is correctly taken into account.

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  • Received 28 November 2017

DOI:https://doi.org/10.1103/PhysRevFluids.3.043901

©2018 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

Antoine Delon and Alain Cartellier*

  • Université Grenoble Alpes, CNRS, Grenoble INP, LEGI, F-38000 Grenoble, France

Jean-Philippe Matas

  • Laboratoire de Mécanique des Fluides et d'Acoustique, Ecole Centrale de Lyon, CNRS, Université Claude Bernard Lyon 1, INSA Lyon, F-69134 Ecully, France

  • *Also at Institute of Engineering, Université Grenoble Alpes.

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Issue

Vol. 3, Iss. 4 — April 2018

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