Two mechanisms of droplet splashing on a solid substrate

Handle URI:
http://hdl.handle.net/10754/626653
Title:
Two mechanisms of droplet splashing on a solid substrate
Authors:
Jian, Zhen; Josserand, Christophe ( 0000-0003-1429-4209 ) ; Popinet, Stéphane; Ray, Pascal; Zaleski, Stéphane
Abstract:
We investigate droplet impact on a solid substrate in order to understand the influence of the gas in the splashing dynamics. We use numerical simulations where both the liquid and the gas phases are considered incompressible in order to focus on the gas inertial and viscous contributions. We first confirm that the dominant gas effect on the dynamics is due to its viscosity through the cushioning of the gas layer beneath the droplet. We then describe an additional inertial effect that is directly related to the gas density. The two different splashing mechanisms initially suggested theoretically are observed numerically, depending on whether a jet is created before or after the impacting droplet wets the substrate. Finally, we provide a phase diagram of the drop impact outputs as the gas viscosity and density vary, emphasizing the dominant effect of the gas viscosity with a small correction due to the gas density. Our results also suggest that gas inertia influences the splashing formation through a Kelvin–Helmholtz-like instability of the surface of the impacting droplet, in agreement with former theoretical works.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Jian Z, Josserand C, Popinet S, Ray P, Zaleski S (2017) Two mechanisms of droplet splashing on a solid substrate. Journal of Fluid Mechanics 835: 1065–1086. Available: http://dx.doi.org/10.1017/jfm.2017.768.
Publisher:
Cambridge University Press (CUP)
Journal:
Journal of Fluid Mechanics
Issue Date:
29-Nov-2017
DOI:
10.1017/jfm.2017.768
Type:
Article
ISSN:
0022-1120; 1469-7645
Additional Links:
https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/two-mechanisms-of-droplet-splashing-on-a-solid-substrate/A56AA4509D859674A0D3566C42266CD0
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorJian, Zhenen
dc.contributor.authorJosserand, Christopheen
dc.contributor.authorPopinet, Stéphaneen
dc.contributor.authorRay, Pascalen
dc.contributor.authorZaleski, Stéphaneen
dc.date.accessioned2018-01-01T12:19:05Z-
dc.date.available2018-01-01T12:19:05Z-
dc.date.issued2017-11-29en
dc.identifier.citationJian Z, Josserand C, Popinet S, Ray P, Zaleski S (2017) Two mechanisms of droplet splashing on a solid substrate. Journal of Fluid Mechanics 835: 1065–1086. Available: http://dx.doi.org/10.1017/jfm.2017.768.en
dc.identifier.issn0022-1120en
dc.identifier.issn1469-7645en
dc.identifier.doi10.1017/jfm.2017.768en
dc.identifier.urihttp://hdl.handle.net/10754/626653-
dc.description.abstractWe investigate droplet impact on a solid substrate in order to understand the influence of the gas in the splashing dynamics. We use numerical simulations where both the liquid and the gas phases are considered incompressible in order to focus on the gas inertial and viscous contributions. We first confirm that the dominant gas effect on the dynamics is due to its viscosity through the cushioning of the gas layer beneath the droplet. We then describe an additional inertial effect that is directly related to the gas density. The two different splashing mechanisms initially suggested theoretically are observed numerically, depending on whether a jet is created before or after the impacting droplet wets the substrate. Finally, we provide a phase diagram of the drop impact outputs as the gas viscosity and density vary, emphasizing the dominant effect of the gas viscosity with a small correction due to the gas density. Our results also suggest that gas inertia influences the splashing formation through a Kelvin–Helmholtz-like instability of the surface of the impacting droplet, in agreement with former theoretical works.en
dc.publisherCambridge University Press (CUP)en
dc.relation.urlhttps://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/two-mechanisms-of-droplet-splashing-on-a-solid-substrate/A56AA4509D859674A0D3566C42266CD0en
dc.subjectdropsen
dc.subjectdrops and bubblesen
dc.subjectinterfacial flows (free surface)en
dc.titleTwo mechanisms of droplet splashing on a solid substrateen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Fluid Mechanicsen
dc.contributor.institutionState Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, International Center for Applied Mechanics, School of Aerospace, Xi’an Jiaotong University, Xi’an 710049, PR Chinaen
dc.contributor.institutionSorbonne Universités, UPMC Université Paris 06, CNRS, UMR 7190, Institut Jean Le Rond d’Alembert, F-75005 Paris, Franceen
dc.contributor.institutionLadHyX, CNRS, Ecole Polytechnique, UMR 7646, 91128 Palaiseau, Franceen
kaust.authorJian, Zhenen
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