Show simple item record

dc.contributor.authorLi, Erqiang
dc.contributor.authorThoraval, Marie-Jean
dc.contributor.authorMarston, Jeremy
dc.contributor.authorThoroddsen, Sigurdur T
dc.date.accessioned2018-12-31T13:27:55Z
dc.date.available2018-12-31T13:27:55Z
dc.date.issued2018-06-13
dc.identifier.citationLi EQ, Thoraval M-J, Marston JO, Thoroddsen ST (2018) Early azimuthal instability during drop impact. Journal of Fluid Mechanics 848: 821–835. Available: http://dx.doi.org/10.1017/jfm.2018.383.
dc.identifier.issn0022-1120
dc.identifier.issn1469-7645
dc.identifier.doi10.1017/jfm.2018.383
dc.identifier.urihttp://hdl.handle.net/10754/630502
dc.description.abstractWhen a drop impacts on a liquid surface its bottom is deformed by lubrication pressure and it entraps a thin disc of air, thereby making contact along a ring at a finite distance from the centreline. The outer edge of this contact moves radially at high speed, governed by the impact velocity and bottom radius of the drop. Then at a certain radial location an ejecta sheet emerges from the neck connecting the two liquid masses. Herein, we show the formation of an azimuthal instability at the base of this ejecta, in the sharp corners at the two sides of the ejecta. They promote regular radial vorticity, thereby breaking the axisymmetry of the motions on the finest scales. The azimuthal wavenumber grows with the impact Weber number, based on the bottom curvature of the drop, reaching over 400 streamwise streaks around the periphery. This instability occurs first at Reynolds numbers of ∼7000, but for larger is overtaken by the subsequent axisymmetric vortex shedding and their interactions can form intricate tangles, loops or chains.
dc.description.sponsorshipThe work reported herein was funded by King Abdullah University of Science and Technology (KAUST) under grant URF/1/2621-01-01. E.Q.L. acknowledges the Thousand Young Talents Program of China, the National Natural Science Foundation of China (grants nos 11772327, 11642019 and 11621202) and Fundamental Research Funds for the Central Universities (grant no. WK2090050041). M.-J.T. acknowledges the financial support from the National Natural Science Foundation of China (grant nos 11542016 and 11702210) and the 111 project (B18040). M.-J.T. is also supported by the Cyrus Tang Foundation through the Tang Scholar program, and by the Thousand Young Talents Program of China. We thank W. Chan and K. Taylor at Specialized Imaging for their assistance.
dc.publisherCambridge University Press (CUP)
dc.relation.urlhttps://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/early-azimuthal-instability-during-drop-impact/4679A38A854AC97B5BB9C2F5AC7E64B1
dc.subjectcapillary flows
dc.subjectdrops and bubbles
dc.subjectinterfacial flows (free surface)
dc.titleEarly azimuthal instability during drop impact
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentHigh-Speed Fluids Imaging Laboratory
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentOffice of the VP
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJournal of Fluid Mechanics
dc.contributor.institutionDepartment of Modern Mechanics, University of Science and Technology of China, Hefei, 230027, , China
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, , China
dc.contributor.institutionDepartment of Chemical Engineering, Texas Tech University, Lubbock, TX, 79409-3121, , United States
kaust.personLi, Erqiang
kaust.personThoraval, Marie-Jean
kaust.personMarston, Jeremy
kaust.personThoroddsen, Sigurdur T.
kaust.grant.numberURF/1/2621-01-01
dc.date.published-online2018-06-13
dc.date.published-print2018-08


This item appears in the following Collection(s)

Show simple item record