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SUMMARY:The world in a bowl of mush: solidification and fluid flow from th
 e inner core to the Arctic Ocean - Dr Jerome Neufeld\, ITG
DTSTART:20080508T103000Z
DTEND:20080508T113000Z
UID:TALK11514@talks.cam.ac.uk
CONTACT:Anne Alexander
DESCRIPTION:\nThe processes of solidification play a significant role in a
  whole host of geophysical systems -- from solidification of the Earth's c
 ore\, to the formation of ice in the polar oceans.  The presence of impuri
 ties in these systems changes not only the crystal structure of the solid 
 formed\, but can also drive large scale flows through segregation of the i
 mpurity upon solidification.  In this seminar I will investigate the coupl
 ing of external hydrodynamics with the growth of a dendritic array of crys
 tals\, termed a mushy layer.  We show how the natural buoyant modes of con
 vection can be superseded by a forced mode of convection for sufficiently 
 vigorous external flows.  In the case of an ammonium chloride mushy layer 
 grown in a laboratory flume\, these forced flows give rise to dramatic cha
 nges in the local solid fraction of the crystal network.  The physical mec
 hanisms coupling crystal growth and external hydrodynamics are investigate
 d theoretically by means of a full linear stability analysis and are compa
 red with experimental results.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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