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On the formation and recurrent shedding of ligaments in droplet aerobreakup

Published online by Cambridge University Press:  07 October 2020

Benedikt Dorschner Open the ORCID record for Benedikt Dorschner [Opens in a new window] ,
Luc Biasiori-Poulanges ,
Kevin Schmidmayer ,
Hazem El-Rabii Open the ORCID record for Hazem El-Rabii [Opens in a new window]  and
Tim Colonius
Benedikt Dorschner*
Affiliation:
Division of Engineering and Applied Science, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA91125, USA
Luc Biasiori-Poulanges
Affiliation:
Institut Pprime, CNRS UPR 3346 – Université de Poitiers – ISAE-ENSMA, 1 avenue Clément Ader, 86961Futuroscope, France
Kevin Schmidmayer
Affiliation:
Division of Engineering and Applied Science, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA91125, USA
Hazem El-Rabii*
Affiliation:
Institut Pprime, CNRS UPR 3346 – Université de Poitiers – ISAE-ENSMA, 1 avenue Clément Ader, 86961Futuroscope, France
Tim Colonius
Affiliation:
Division of Engineering and Applied Science, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA91125, USA
*
†Email addresses for correspondence: [email protected], [email protected]
†Email addresses for correspondence: [email protected], [email protected]
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Abstract

The breakup of water droplets when exposed to high-speed gas flows is investigated using both high-magnification shadowgraphy experiments as well as fully three-dimensional numerical simulations, which account for viscous as well as capillary effects. After thorough validation of the simulations with respect to the experiments, we elucidate the ligament formation process and the effect of surface tension. By Fourier decomposition of the flow field, we observe the development of specific azimuthal modes, which destabilize the liquid sheet surrounding the droplet. Eventually, the liquid sheet is ruptured, which leads to the formation of ligaments. We further observe the ligament formation and shedding to be a recurrent process. While the first ligament shedding weakly depends on the Weber number, subsequent shedding processes seem to be driven primarily by inertia and the vortex shedding in the wake of the deformed droplet.

JFM classification

Aerodynamics: High-speed flow Drops and Bubbles: Breakup/coalescence Drops and Bubbles: Aerosols/atomization
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 904 , 10 December 2020 , A20
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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