Stabilization of Leidenfrost vapour layer by textured superhydrophobic surfaces

Handle URI:
http://hdl.handle.net/10754/562327
Title:
Stabilization of Leidenfrost vapour layer by textured superhydrophobic surfaces
Authors:
Vakarelski, Ivan Uriev ( 0000-0001-9244-9160 ) ; Patankar, Neelesh A.; Marston, Jeremy; Chan, Derek Y C; Thoroddsen, Sigurdur T. ( 0000-0001-6997-4311 )
Abstract:
In 1756, Leidenfrost observed that water drops skittered on a sufficiently hot skillet, owing to levitation by an evaporative vapour film. Such films are stable only when the hot surface is above a critical temperature, and are a central phenomenon in boiling. In this so-called Leidenfrost regime, the low thermal conductivity of the vapour layer inhibits heat transfer between the hot surface and the liquid. When the temperature of the cooling surface drops below the critical temperature, the vapour film collapses and the system enters a nucleate-boiling regime, which can result in vapour explosions that are particularly detrimental in certain contexts, such as in nuclear power plants. The presence of these vapour films can also reduce liquid-solid drag. Here we show how vapour film collapse can be completely suppressed at textured superhydrophobic surfaces. At a smooth hydrophobic surface, the vapour film still collapses on cooling, albeit at a reduced critical temperature, and the system switches explosively to nucleate boiling. In contrast, at textured, superhydrophobic surfaces, the vapour layer gradually relaxes until the surface is completely cooled, without exhibiting a nucleate-boiling phase. This result demonstrates that topological texture on superhydrophobic materials is critical in stabilizing the vapour layer and thus in controlling-by heat transfer-the liquid-gas phase transition at hot surfaces. This concept can potentially be applied to control other phase transitions, such as ice or frost formation, and to the design of low-drag surfaces at which the vapour phase is stabilized in the grooves of textures without heating. © 2012 Macmillan Publishers Limited. All rights reserved.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Clean Combustion Research Center; Mechanical Engineering Program; High-Speed Fluids Imaging Laboratory
Publisher:
Springer Nature
Journal:
Nature
Issue Date:
12-Sep-2012
DOI:
10.1038/nature11418
Type:
Article
ISSN:
00280836
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.authorVakarelski, Ivan Urieven
dc.contributor.authorPatankar, Neelesh A.en
dc.contributor.authorMarston, Jeremyen
dc.contributor.authorChan, Derek Y Cen
dc.contributor.authorThoroddsen, Sigurdur T.en
dc.date.accessioned2015-08-03T10:01:03Zen
dc.date.available2015-08-03T10:01:03Zen
dc.date.issued2012-09-12en
dc.identifier.issn00280836en
dc.identifier.doi10.1038/nature11418en
dc.identifier.urihttp://hdl.handle.net/10754/562327en
dc.description.abstractIn 1756, Leidenfrost observed that water drops skittered on a sufficiently hot skillet, owing to levitation by an evaporative vapour film. Such films are stable only when the hot surface is above a critical temperature, and are a central phenomenon in boiling. In this so-called Leidenfrost regime, the low thermal conductivity of the vapour layer inhibits heat transfer between the hot surface and the liquid. When the temperature of the cooling surface drops below the critical temperature, the vapour film collapses and the system enters a nucleate-boiling regime, which can result in vapour explosions that are particularly detrimental in certain contexts, such as in nuclear power plants. The presence of these vapour films can also reduce liquid-solid drag. Here we show how vapour film collapse can be completely suppressed at textured superhydrophobic surfaces. At a smooth hydrophobic surface, the vapour film still collapses on cooling, albeit at a reduced critical temperature, and the system switches explosively to nucleate boiling. In contrast, at textured, superhydrophobic surfaces, the vapour layer gradually relaxes until the surface is completely cooled, without exhibiting a nucleate-boiling phase. This result demonstrates that topological texture on superhydrophobic materials is critical in stabilizing the vapour layer and thus in controlling-by heat transfer-the liquid-gas phase transition at hot surfaces. This concept can potentially be applied to control other phase transitions, such as ice or frost formation, and to the design of low-drag surfaces at which the vapour phase is stabilized in the grooves of textures without heating. © 2012 Macmillan Publishers Limited. All rights reserved.en
dc.publisherSpringer Natureen
dc.titleStabilization of Leidenfrost vapour layer by textured superhydrophobic surfacesen
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.journalNatureen
dc.contributor.institutionDepartment of Mechanical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3111, United Statesen
dc.contributor.institutionDepartment of Mathematics and Statistics, University of Melbourne, Parkville 3010, VIC, Australiaen
dc.contributor.institutionFaculty of Life and Social Sciences, Swinburne University of Technology, Hawthorn 3122, VIC, Australiaen
kaust.authorVakarelski, Ivan Urieven
kaust.authorMarston, Jeremyen
kaust.authorThoroddsen, Sigurdur T.en
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