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UID:20251121T020906EST-6173VluwiB@132.216.98.100
DTSTAMP:20251121T070906Z
DESCRIPTION: \n\nUnsteady flow barriers at scales from geophysics to microf
 luidics: identification\, control\, and optimizing transport\n\nAbstract: 
 Unsteady flows typically contain clumps of particles moving coherently\, i
 n addition to regions in which extensive mixing occurs.  The boundaries of
  each of these regions might be considered as  'unsteady flow barriers\,' 
  since they move about in time.  Exactly defining what these are is\, howe
 ver\, problematic.  Such flow barriers may be thought to demarcate geophys
 ical features such as the Antarctic Circumpolar Vortex (ozone hole)\, or t
 he interface between two fluids that one desires to mix together for DNA s
 ynthesis in a microfluidic device.  This talk will examine several theoret
 ical issues and applications arising from attempting to understand\, and u
 se\, unsteady flow barriers.   The relationship to  stable and unstable ma
 nifolds of hyperbolic trajectories in nonautonomous dynamical systems will
  be established.  Using the solution to the energy-constrained optimizatio
 n problem of maximizing mixing between two fluids across their mutual inte
 rface\,  an optimum design for a cross-channel micromixer is proposed.  On
 going work on manipulating flow barriers according to a user-defined unste
 ady prescription is presented\; this offers an exciting new tool for flow 
 control.   Additionally\, some emerging work on how these ideas can be use
 d to correct errors in oceanic velocity data obtained from satellite obser
 vations will be briefly discussed.\n
DTSTART:20161205T200000Z
DTEND:20161205T200000Z
LOCATION:Room 920\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Sanjeeva Balasuriya - University of Adelaide
URL:/mathstat/channels/event/sanjeeva-balasuriya-unive
 rsity-adelaide-264312
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