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dc.contributor.authorBeilharz, D.
dc.contributor.authorGuyon, A.
dc.contributor.authorLi, Erqiang
dc.contributor.authorThoraval, M.-J.
dc.contributor.authorThoroddsen, Sigurdur T
dc.date.accessioned2015-08-18T08:36:17Z
dc.date.available2015-08-18T08:36:17Z
dc.date.issued2015-08-14
dc.identifier.citationAntibubbles and fine cylindrical sheets of air 2015, 779:87 Journal of Fluid Mechanics
dc.identifier.issn0022-1120
dc.identifier.issn1469-7645
dc.identifier.doi10.1017/jfm.2015.335
dc.identifier.urihttp://hdl.handle.net/10754/574978
dc.description.abstractDrops impacting at low velocities onto a pool surface can stretch out thin hemispherical sheets of air between the drop and the pool. These air sheets can remain intact until they reach submicron thicknesses, at which point they rupture to form a myriad of microbubbles. By impacting a higher-viscosity drop onto a lower-viscosity pool, we have explored new geometries of such air films. In this way we are able to maintain stable air layers which can wrap around the entire drop to form repeatable antibubbles, i.e. spherical air layers bounded by inner and outer liquid masses. Furthermore, for the most viscous drops they enter the pool trailing a viscous thread reaching all the way to the pinch-off nozzle. The air sheet can also wrap around this thread and remain stable over an extended period of time to form a cylindrical air sheet. We study the parameter regime where these structures appear and their subsequent breakup. The stability of these thin cylindrical air sheets is inconsistent with inviscid stability theory, suggesting stabilization by lubrication forces within the submicron air layer. We use interferometry to measure the air-layer thickness versus depth along the cylindrical air sheet and around the drop. The air film is thickest above the equator of the drop, but thinner below the drop and up along the air cylinder. Based on microbubble volumes, the thickness of the cylindrical air layer becomes less than 100 nm before it ruptures.
dc.language.isoen
dc.publisherCambridge University Press (CUP)
dc.relation.urlhttp://www.journals.cambridge.org/abstract_S0022112015003353
dc.rightsThis is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.subjectbreakup/coalescence
dc.subjectbubble dynamics
dc.subjectdrops and bubbles
dc.titleAntibubbles and fine cylindrical sheets of air
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.identifier.journalJournal of Fluid Mechanics
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionDépartement de Mécanique, Ecole Polytechnique, 91128 Palaiseau CEDEX, France
dc.contributor.institutionPhysics of Fluids Group, Faculty of Science and Technology, MESA+ Institute, University of Twente, 7500 AE Enschede, The Netherlands
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personThoraval, Marie-Jean
kaust.personThoroddsen, Sigurdur T.
kaust.personLi, Erqiang
refterms.dateFOA2018-06-13T12:14:03Z


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