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Dimple coalescence and liquid droplets distributions during phase separation in a pure fluid under microgravity

hal.structure.identifierDepartment of Physics and Astronomy [Charleston]
dc.contributor.authorOPRISAN, Ana
hal.structure.identifierDepartment of Physics and Astronomy [Charleston]
dc.contributor.authorOPRISAN, Sorinel A
hal.structure.identifierDepartment of Physics [New Orleans]
dc.contributor.authorHEGSETH, John J
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.identifierService des Basses Températures [SBT ]
hal.structure.identifierPhysique et mécanique des milieux hétérogenes (UMR 7636) [PMMH]
dc.contributor.authorBEYSENS, Daniel
dc.date.issued2014
dc.identifier.issn1292-8941
dc.description.abstractEnPhase separation has important implications for the mechanical, thermal, and electrical properties of materials. Weightless conditions prevent buoyancy and sedimentation from affecting the dynamics of phase separation and the morphology of the domains. In our experiments, sulfur hexafluoride (SF6) was initially heated about 1K above its critical temperature under microgravity conditions and then repeatedly quenched using temperature steps, the last one being of 3.6 mK, until it crossed its critical temperature and phase-separated into gas and liquid domains. Both full view (macroscopic) and microscopic view images of the sample cell unit were analyzed to determine the changes in the distribution of liquid droplet diameters during phase separation. Previously, dimple coalescences were only observed in density-matched binary liquid mixture near its critical point of miscibility. Here we present experimental evidences in support of dimple coalescence between phase-separated liquid droplets in pure, supercritical, fluids under microgravity conditions. Although both liquid mixtures and pure fluids belong to the same universality class, both the mass transport mechanisms and their thermophysical properties are significantly different. In supercritical pure fluids the transport of heat and mass are strongly coupled by the enthalpy of condensation, whereas in liquid mixtures mass transport processes are purely diffusive. The viscosity is also much smaller in pure fluids than in liquid mixtures. For these reasons, there are large differences in the fluctuation relaxation time and hydrodynamics flows that prompted this experimental investigation. We found that the number of droplets increases rapidly during the intermediate stage of phase separation. We also found that above a cutoff diameter of about 100 microns the size distribution of droplets follows a power law with an exponent close to -2, as predicted from phenomenological considerations.
dc.language.isoen
dc.publisherEDP Sciences: EPJ
dc.title.enDimple coalescence and liquid droplets distributions during phase separation in a pure fluid under microgravity
dc.typeArticle de revue
dc.identifier.doi10.1140/epje/i2014-14085-2
dc.subject.halPhysique [physics]/Mécanique [physics]/Mécanique des fluides [physics.class-ph]
bordeaux.journalEuropean Physical Journal E: Soft matter and biological physics
bordeaux.page85
bordeaux.volume37
bordeaux.issue9
bordeaux.peerReviewedoui
hal.identifierhal-01092810
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01092810v1
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