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dc.contributor.author
 hal.structure.identifier
RAVELET, Florent
134975 Laboratoire de Dynamique des Fluides [DynFluid]
690 Institut de mécanique des fluides de Toulouse [IMFT]
dc.contributor.author
 hal.structure.identifier
COLIN, Catherine
690 Institut de mécanique des fluides de Toulouse [IMFT]
dc.contributor.author
 hal.structure.identifier
RISSO, Frédéric
690 Institut de mécanique des fluides de Toulouse [IMFT]
dc.date.accessioned2014
dc.date.available2014
dc.date.issued2011
dc.date.submitted2014
dc.identifier.urihttp://hdl.handle.net/10985/8540
dc.description.abstractExperimental investigations of the dynamics of a deformable bubble rising in a uniform turbulent flow are reported. The turbulence is characterized by fast PIV. Time-resolved evolutions of bubble translation, rotation and deformation are determined by three-dimensional shape recognition from three perpendicular camera views. The bubble dynamics involves three mechanisms fairly decoupled: (i) average shape is imposed by the mean motion of the bubble relative to liquid; (ii) wake instability generates almost periodic oscillations of velocity and orientation; (iii) turbulence causes random deformations that sometimes lead to breakup. The deformation dynamics is radically different from that observed in the absence of a significant sliding motion due to buoyancy. Large deformations that lead to breakup are not axisymmetric and correspond to elongations in the horizontal direction. The timescale of decay of shape oscillations is of the same order as their natural frequency f2, so that breakup always results from the interaction with a single turbulent eddy. This overdamping causes the statistics of large deformations and the statistics of breakup identical to the statistics of turbulence. The bubble response time f2 however controls the duration of individual breakup events.
dc.language.isoen_US
dc.publisherAIP
dc.rightsPost-print
dc.titleOn the dynamics and breakup of a bubble immersed in a turbulent flow
dc.identifier.doi10.1063/1.3648035
dc.typdocArticles dans des revues avec comité de lecture
dc.localisationCentre de Paris
dc.subject.halPhysique: Dynamique des Fluides
ensam.audienceInternationale
ensam.page103301
ensam.journalPhysics of Fluids
ensam.volume23


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