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SUMMARY:The fluid dynamics of a suspension of frazil ice crystals - David 
 Rees Jones (Atmospheric\, Oceanic and Planetary Physics\, University of Ox
 ford)
DTSTART:20160125T130000Z
DTEND:20160125T140000Z
UID:TALK63805@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:The initial stages of sea ice formation in a turbulent ocean t
 ypically involve the growth of a suspension of frazil ice crystals in supe
 rcooled waters. Eddies in the fluid flow act to keep the crystals suspende
 d\, while the relative buoyancy of the crystals causes them to rise\, even
 tually sedimenting to form a layer of ice. The resulting granular ice has 
 been observed to make up a significant fraction of ice cover in certain lo
 cations. Here\, we consider the interaction between the fluid dynamics of 
 a suspension of crystals and the thermodynamics of phase change governing 
 the growth and melting of the crystals. The growth of these crystals is dy
 namically coupled to the fluid flow: advection enhances the transport and 
 removal of latent heat that controls crystal growth\, whilst the particles
  provide hydrodynamic and thermal feedbacks on the flow. We use a combinat
 ion of scaling analysis\, linear stability analysis and direct numerical s
 imulation to illustrate the important features of this multiphase flow.
LOCATION:MR5\, Centre for Mathematical Sciences
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