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On the formation and recurrent shedding of ligaments in droplet aerobreakup

Dorschner, Benedikt and Biasiori-Poulanges, Luc and Schmidmayer, Kevin and El-Rabii, Hazem and Colonius, Tim (2020) On the formation and recurrent shedding of ligaments in droplet aerobreakup. Journal of Fluid Mechanics, 904 . Art. No. A20. ISSN 0022-1120. https://resolver.caltech.edu/CaltechAUTHORS:20200427-080644291

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1017/jfm.2020.699DOIArticle
https://arxiv.org/abs/2003.00048arXivDiscussion Paper
ORCID:
AuthorORCID
Dorschner, Benedikt0000-0001-8926-7542
Schmidmayer, Kevin0000-0003-0444-3098
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2020 Published by Cambridge University Press. Received 2 March 2020; revised 13 May 2020; accepted 14 August 2020. The experimental work (L.B.P. and H.E.R.) was supported by the Région Nouvelle-Aquitaine as part of the SEIGLE project (2017-1R50115) and the CPER FEDER project. B.D. acknowledges support from the Swiss National Science Foundation Grant No. P2EZP2_178436. Computations associated with parallel performance have utilized the Extreme Science and Engineering Discovery Environment, which is supported by the National Science Foundation grant number CTS120005. The authors report no conflict of interest.
Funders:
Funding AgencyGrant Number
Région Nouvelle-Aquitaine2017-1R50115
Contrat de plan État-régionUNSPECIFIED
Swiss National Science Foundation (SNSF)P2EZP2_178436
NSFCTS-120005
Subject Keywords:high-speed flow, breakup/coalescence, aerosols/atomization
Record Number:CaltechAUTHORS:20200427-080644291
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200427-080644291
Official Citation:Dorschner, B., Biasiori-Poulanges, L., Schmidmayer, K., El-Rabii, H., & Colonius, T. (2020). On the formation and recurrent shedding of ligaments in droplet aerobreakup. Journal of Fluid Mechanics, 904, A20. doi:10.1017/jfm.2020.699
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102780
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 Apr 2020 15:54
Last Modified:18 Nov 2020 18:38

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