Cavity formation by the impact of Leidenfrost spheres

Handle URI:
http://hdl.handle.net/10754/562175
Title:
Cavity formation by the impact of Leidenfrost spheres
Authors:
Marston, Jeremy; Vakarelski, Ivan Uriev ( 0000-0001-9244-9160 ) ; Thoroddsen, Sigurdur T. ( 0000-0001-6997-4311 )
Abstract:
We report observations of cavity formation and subsequent collapse when a heated sphere impacts onto a liquid pool. When the sphere temperature is much greater than the boiling point of the liquid, we observe an inverted Leidenfrost effect where the sphere is encompassed by a vapour layer that prevents physical contact with the liquid. This creates the ultimate non-wetting scenario during sphere penetration through a free surface, producing very smooth cavity walls. In some cases during initial entry, however, the liquid contacts the sphere at the equator, leading to the formation of a dual cavity structure. For cold sphere impacts, where a contact line is observed, we reveal details of the contact line pinning, which initially forms a sawtooth pattern. We also observe surface waves on the cavity interface for cold spheres. We compare our experimental results to previous studies of cavity dynamics and, in particular, the influence of hydrophobicity on the entry of the sphere. © 2012 Cambridge University Press.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Clean Combustion Research Center; Mechanical Engineering Program; High-Speed Fluids Imaging Laboratory
Publisher:
Cambridge University Press (CUP)
Journal:
Journal of Fluid Mechanics
Issue Date:
May-2012
DOI:
10.1017/jfm.2012.124
Type:
Article
ISSN:
00221120
Sponsors:
This work was partially supported by KAUST AEA grant 7000000028.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorMarston, Jeremyen
dc.contributor.authorVakarelski, Ivan Urieven
dc.contributor.authorThoroddsen, Sigurdur T.en
dc.date.accessioned2015-08-03T09:46:32Zen
dc.date.available2015-08-03T09:46:32Zen
dc.date.issued2012-05en
dc.identifier.issn00221120en
dc.identifier.doi10.1017/jfm.2012.124en
dc.identifier.urihttp://hdl.handle.net/10754/562175en
dc.description.abstractWe report observations of cavity formation and subsequent collapse when a heated sphere impacts onto a liquid pool. When the sphere temperature is much greater than the boiling point of the liquid, we observe an inverted Leidenfrost effect where the sphere is encompassed by a vapour layer that prevents physical contact with the liquid. This creates the ultimate non-wetting scenario during sphere penetration through a free surface, producing very smooth cavity walls. In some cases during initial entry, however, the liquid contacts the sphere at the equator, leading to the formation of a dual cavity structure. For cold sphere impacts, where a contact line is observed, we reveal details of the contact line pinning, which initially forms a sawtooth pattern. We also observe surface waves on the cavity interface for cold spheres. We compare our experimental results to previous studies of cavity dynamics and, in particular, the influence of hydrophobicity on the entry of the sphere. © 2012 Cambridge University Press.en
dc.description.sponsorshipThis work was partially supported by KAUST AEA grant 7000000028.en
dc.publisherCambridge University Press (CUP)en
dc.subjectcavitationen
dc.subjectcontact linesen
dc.subjecttransition to turbulenceen
dc.titleCavity formation by the impact of Leidenfrost spheresen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentHigh-Speed Fluids Imaging Laboratoryen
dc.identifier.journalJournal of Fluid Mechanicsen
kaust.authorMarston, Jeremyen
kaust.authorVakarelski, Ivan Urieven
kaust.authorThoroddsen, Sigurdur T.en
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