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SUMMARY:The Behaviour of Multiphase Plumes with Chemical Reaction - Dr S C
 ardoso\, Dept. of Chemical Engineering\, University of Cambridge
DTSTART:20060615T150000Z
DTEND:20060615T160000Z
UID:TALK4899@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:Multiphase plumes may result from a concentrated and continuou
 s release of buoyancy in the form of small bubbles\, droplets or particles
 . Here\, we present an experimental and theoretical study of the behaviour
  of such expanding plumes. Laboratory measurements using Particle Image Ve
 locimetry are combined with scaling and numerical results. It is found tha
 t mixing and dispersal in reactive plumes is fundamentally different to th
 at found in plumes without reaction\; this difference in behaviour is caus
 ed by buoyancy-induced changes in turbulence and fluid flowing in the oppo
 site direction to that of the bulk plume flow. Cases are observed which re
 sult in collapsing or imploding plumes\; we use our model to propose a cri
 terion which predicts this occurrence\, and verify it experimentally for a
  wide range of reaction rates and release conditions. Implications of our 
 results for deep ocean CO2 plumes\, volcanic eruptions and buoyancy-driven
  cloud formations are explored.
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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