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Near-critical fluid boiling: overheating and wetting films

hal.structure.identifierDepartment of Physics [New Orleans]
dc.contributor.authorHEGSETH, John
hal.structure.identifierDepartment of Physics and Astronomy [Charleston]
dc.contributor.authorOPRISAN, Ana
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierESEME : Équipe du Supercritique pour l'Environnement, les Matériaux et l'Espace : Équipe commune CEA-CNRS (2000-2014)
dc.contributor.authorGARRABOS, Yves
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierESEME : Équipe du Supercritique pour l'Environnement, les Matériaux et l'Espace : Équipe commune CEA-CNRS (2000-2014)
dc.contributor.authorLECOUTRE-CHABOT, Carole
hal.structure.identifierPhysique et mécanique des milieux hétérogenes (UMR 7636) [PMMH]
dc.contributor.authorNIKOLAYEV, Vadim
hal.structure.identifierPhysique et mécanique des milieux hétérogenes (UMR 7636) [PMMH]
dc.contributor.authorBEYSENS, Daniel
dc.date.issued2008
dc.identifier.issn1292-8941
dc.description.abstractEnThe heating of coexisting gas and liquid phases of pure fluid through its critical point makes the fluid extremely compressible, expandable, slows the diffusive transport, and decreases the contact angle to zero (perfect wetting by the liquid phase). We have performed experiments on near-critical fluids in a variable volume cell in the weightlessness of an orbiting space vehicle, to suppress buoyancy-driven flows and gravitational constraints on the liquid-gas interface. The high compressibility, high thermal expansion, and low thermal diffusivity lead to a pronounced adiabatic heating called the piston effect. We have directly visualized the near-critical fluid's boundary layer response to a volume quench when the external temperature is held constant. We have found that when the system's temperature T is increased at a constant rate past the critical temperature T(c), the interior of the fluid gains a higher temperature than the hot wall (overheating). This extends previous results in temperature quenching experiments in a similarly prepared system when the gas is clearly isolated from the wall. Large elliptical wetting film distortions are also seen during these ramps. By ray tracing through the elliptically shaped wetting film, we find very thick wetting film on the walls. This wetting film is at least one order of magnitude thicker than films that form in the Earth's gravity. The thick wetting film isolates the gas bubble from the wall allowing gas overheating to occur due to the difference in the piston effect response between gas and liquid. Remarkably, this overheating continues and actually increases when the fluid is ramped into the single-phase supercritical phase.
dc.language.isoen
dc.publisherEDP Sciences: EPJ
dc.title.enNear-critical fluid boiling: overheating and wetting films
dc.typeArticle de revue
dc.identifier.doi10.1140/epje/i2007-10333-x
dc.subject.halChimie/Matériaux
bordeaux.journalEuropean Physical Journal E: Soft matter and biological physics
bordeaux.page345-353
bordeaux.volume26
bordeaux.issue4
bordeaux.peerReviewedoui
hal.identifierhal-00626936
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00626936v1
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