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Thermoconvectional phenomena induced by vibration in supercritical SF6 under weightlessness

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.identifierService des Basses Températures [SBT ]
hal.structure.identifierPhysique et mécanique des milieux hétérogenes (UMR 7636) [PMMH]
hal.structure.identifierESEME : Équipe du Supercritique pour l'Environnement, les Matériaux et l'Espace : Équipe commune CEA-CNRS (2000-2014)
dc.contributor.authorBEYSENS, Daniel
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.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.authorDEJOAN, Anne
hal.structure.identifierinstitute for Problems in Mechanics [Moscow]
dc.contributor.authorPOLEZHAEV, Vadim I.
hal.structure.identifierinstitute for Problems in Mechanics [Moscow]
dc.contributor.authorEMELIANOV, Victor M.
dc.date.issued2007
dc.identifier.issn1539-3755
dc.description.abstractEnThe effect of a linear harmonic vibration on heat propagation is investigated in near-critical SF6 under weightlessness conditions in space. Heat was issued from a pointlike source (thermistor) a situation representative of an industrial use of pressurized supercritical fluid storage. Two kinds of vibrations were used, large amplitude (64 mm) at 0.2 Hz and low amplitude (0.8 mm) at 1.6 Hz, with temperatures from 5 K to 20 mK from the critical temperature. The vibrations are seen to strongly affect the evolution and shape of the hot boundary layer (HBL), the heat exchange between the heat source and the fluid, and the bulk thermalization process by the adiabatic piston-effect process. The HBL is initially convected as symmetrical plumes over a distance that only depends on the vibration velocity and which corresponds to a Rayleigh-Bénard-like instability where the vibration acceleration acts as the earth gravity. Then the extremities of the plumes are convected perpendicularly to the direction of oscillation as two “pancakes,” a process encountered in the vibrational Rayleigh-Bénard instability. When the vibration velocity is small, only one pancake centered at the hot source is observed. Temperature evolutions of the hot source and the fluid are studied in different locations. Convection flows and adiabatic piston effect compete to determine the thermal dynamics, with the latter being the most efficient near the critical point. The experimental results are compared with a two-dimensional numerical simulation that highlights the similarities and differences between the very compressible van der Waals gas and an ideal gas.
dc.language.isoen
dc.publisherAmerican Physical Society
dc.subject.enCritical fluids
dc.subject.enVibrations
dc.subject.enZero gravity experiments
dc.subject.enConvection
dc.subject.enBoundary layer instability
dc.title.enThermoconvectional phenomena induced by vibration in supercritical SF6 under weightlessness
dc.typeArticle de revue
dc.identifier.doi10.1103/PhysRevE.75.056317
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]
dc.subject.halPhysique [physics]/Mécanique [physics]/Thermique [physics.class-ph]
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Mécanique statistique [cond-mat.stat-mech]
bordeaux.journalPhysical Review E : Statistical, Nonlinear, and Soft Matter Physics
bordeaux.page056317
bordeaux.volume75
bordeaux.issue5
bordeaux.peerReviewedoui
hal.identifierhal-00153606
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00153606v1
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