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SUMMARY:Stretching\, droplets &amp\; instabilities in non-newtonian flow: 
 The role of visco-elasticity - Jerry Gollub\, Department of Physics\, Have
 rford College
DTSTART:20081204T113000Z
DTEND:20081204T123000Z
UID:TALK14276@talks.cam.ac.uk
CONTACT:Dr C. P.  Caulfield
DESCRIPTION:\nViscoelastic fluids (e.g. polymeric solutions) can flow in s
 urprising ways.  This talk presents several examples\, based on experiment
 s at small scales\, in microfluidic channels.  \n* The stretching of thin 
 filaments\, and their breakup into droplets\, has a quite different morpho
 logy and rate compared to Newtonian fluids of similar viscosity.  \n* When
  polymer molecules pass near the hyperbolic point of a microchannel cross 
 flow\, they are strongly stretched. As the strain rate is varied at low Re
 ynolds number (< 100)\, tracer and particle-tracking experiments show that
  molecular stretching produces two flow instabilities: one in which the ve
 locity field becomes strongly asymmetric\, and a second in which it fluctu
 ates non-periodically in time. The flow is strongly perturbed even far fro
 m the region of instability and this phenomenon can be used to produce mix
 ing.  \n \n(Work done with P.E. Arratia and D.  Durian)\n 
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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