On the dynamics and breakup of a bubble immersed in a turbulent flow

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dc.contributor.author RAVELET, Florent
ensam.hal.laboratories
  134975 Laboratoire de Dynamique des Fluides [DynFluid]
  690 Institut de mécanique des fluides de Toulouse [IMFT]
dc.contributor.author COLIN, Catherine
ensam.hal.laboratories
  690 Institut de mécanique des fluides de Toulouse [IMFT]
dc.contributor.author RISSO, Frédéric
ensam.hal.laboratories
  690 Institut de mécanique des fluides de Toulouse [IMFT]
dc.date.accessioned 2014-09-17T09:23:15Z
dc.date.available 2014-09-17T09:23:15Z
dc.date.issued 2011
dc.date.submitted 2014-09-12T12:34:16Z
dc.identifier.uri http://hdl.handle.net/10985/8540
dc.description.abstract Experimental 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. en_US
dc.language.iso en_US en_US
dc.publisher AIP en_US
dc.rights Post-print en_US
dc.title On the dynamics and breakup of a bubble immersed in a turbulent flow en_US
dc.identifier.doi 10.1063/1.3648035
dc.typdoc Articles dans des revues avec comité de lecture en_US
dc.localisation Centre de Paris en_US
dc.subject.hal Physique: Dynamique des Fluides en_US
ensam.audience Internationale en_US
ensam.page 103301 en_US
ensam.journal Physics of Fluids en_US
ensam.volume 23 en_US

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