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Dynamics of squeezing fluids: Clapping wet hands

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dc.contributorVirginia Techen
dc.contributor.authorGart, S.en
dc.contributor.authorChang, B.en
dc.contributor.authorSlama, B.en
dc.contributor.authorGoodnight, R.en
dc.contributor.authorUm, S. H.en
dc.contributor.authorJung, S.en
dc.contributor.departmentBiomedical Engineering and Mechanicsen
dc.date.accessed2013-12-17en
dc.date.accessioned2014-01-17T13:41:32Zen
dc.date.available2014-01-17T13:41:32Zen
dc.date.issued2013-08-09en
dc.description.abstractDroplets splash around when a fluid volume is quickly compressed. This phenomenon has been observed during common activities such as kids clapping with wet hands. The underlying mechanism involves a fluid volume being compressed vertically between two objects. This compression causes the fluid volume to be ejected radially and thereby generate fluid threads and droplets at a high speed. In this study, we designed and performed laboratory experiments to observe the process of thread and drop formation after a fluid is squeezed. A thicker rim at the outer edge forms and moves after the squeezing, and then becomes unstable and breaks into smaller drops. This process differs from previous well-known examples (i.e., transient crown splashes and continuous water bells) in aspects of transient fluid feeding, expanding rim dynamics, or sparsely distributed drops. We compared experimental measurements with theoretical models over three different stages; early squeezing, intermediate sheet-expansion, and later break-up of the liquid thread. In the earlier stage, the fluid is squeezed and its initial velocity is governed by the lubrication force. The outer rim of the liquid sheet forms curved trajectories due to gravity, inertia, drag, and surface tension. At the late stage, drop spacing set by the initial capillary instability does not change in the course of rim expansion, consequently final ejected droplets are very sparse compared to the size of the rim.en
dc.description.sponsorshipNational Science Foundation_1205642en
dc.description.sponsorshipAmerican Chemical Society 52332-DNI9en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationGart, Sean ; Chang, Brian ; Slama, Brice ; et al., Aug 9, 2013. Dynamics of squeezing fluids: Clapping wet hands, PHYSICAL REVIEW E 88(2): 023007. DOI: 10.1103/PhysRevE.88.023007en
dc.identifier.doihttps://doi.org/10.1103/PhysRevE.88.023007en
dc.identifier.issn1539-3755en
dc.identifier.urihttp://hdl.handle.net/10919/24879en
dc.identifier.urlhttp://link.aps.org/doi/10.1103/PhysRevE.88.023007en
dc.language.isoen_USen
dc.publisherAmerican Physical Societyen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectDrop fragmentationen
dc.subjectThin sheetsen
dc.subjectWater bellsen
dc.subjectSurfacesen
dc.subjectImpacten
dc.subjectWavesen
dc.subjectPhysicsen
dc.titleDynamics of squeezing fluids: Clapping wet handsen
dc.title.serialPhysical Review Een
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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