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SUMMARY:On bright pattern of flakes in flow visualization - Kida\, S (Dosh
 isha University\, Japan)
DTSTART:20120925T103000Z
DTEND:20120925T113000Z
UID:TALK40086@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Tiny and thin reflective flakes\, such as aluminum powders\, m
 ica flakes or Kalliroscope\, are widely used to visualize the flow structu
 re in a closed container. From their brightness distribution we may obtain
  useful information on the flow\, such as the occurrence of instability\, 
 the location of turbulent/non-turbulent boundaries\, etc. However\, it is 
 not straightforward to identify which properties of the flow are reflected
  in the visualized patterns. We should note that it is not the orientation
  itself of the flake surface but its time-derivative that responds instant
 aneously to the velocity gradient. The orientation of flake surface has hi
 story effect and may not represent the local flow structure. In this talk 
 we consider the mechanism of formation of brightness distribution of refle
 ctive flakes in flows in a precessing spherical cavity.\n
LOCATION:Seminar Room 2\, Newton Institute Gatehouse
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