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dc.contributor.authorLi, Erqiang
dc.contributor.authorThoroddsen, Sigurdur T
dc.date.accessioned2015-09-15T12:35:57Z
dc.date.available2015-09-15T12:35:57Z
dc.date.issued2015-09-07
dc.identifier.citationTime-resolved imaging of a compressible air disc under a drop impacting on a solid surface 2015, 780:636 Journal of Fluid Mechanics
dc.identifier.issn0022-1120
dc.identifier.issn1469-7645
dc.identifier.doi10.1017/jfm.2015.466
dc.identifier.urihttp://hdl.handle.net/10754/577313
dc.description.abstractWhen a drop impacts on a solid surface, its rapid deceleration is cushioned by a thin layer of air, which leads to the entrapment of a bubble under its centre. For large impact velocities the lubrication pressure in this air layer becomes large enough to compress the air. Herein we use high-speed interferometry, with 200 ns time-resolution, to directly observe the thickness evolution of the air layer during the entire bubble entrapment process. The initial disc radius and thickness shows excellent agreement with available theoretical models, based on adiabatic compression. For the largest impact velocities the air is compressed by as much as a factor of 14. Immediately following the contact, the air disc shows rapid vertical expansion. The radial speed of the surface minima just before contact, can reach 50 times the impact velocity of the drop.
dc.language.isoen
dc.publisherCambridge University Press (CUP)
dc.relation.urlhttp://www.journals.cambridge.org/abstract_S0022112015004668
dc.rightsArchived with thanks to Journal of Fluid Mechanics
dc.subjectbubble dynamics
dc.subjectdrops and bubbles
dc.subjectlubrication theory
dc.titleTime-resolved imaging of a compressible air disc under a drop impacting on a solid surface
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentHigh-Speed Fluids Imaging Laboratory
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJournal of Fluid Mechanics
dc.eprint.versionPost-print
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personLi, Erqiang
kaust.personThoroddsen, Sigurdur T.
refterms.dateFOA2016-03-07T00:00:00Z
dc.date.published-online2015-09-07
dc.date.published-print2015-10


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