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SUMMARY:Purely-elastic flow instabilities\, elastic turbulence and an engi
 neering application - Professor Robert Poole\, Dept of Engineering\, Unive
 rsity of Liverpool
DTSTART:20150528T110000Z
DTEND:20150528T120000Z
UID:TALK59351@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Highly-elastic viscoelastic fluid flows can undergo a series o
 f flow transitions from viscometric laminar flow\, to periodic flow\, to a
 pparently chaotic flow\, and then to fully developed elastic turbulence in
  conditions of negligible inertia in a range of flows. At such low Reynold
 s numbers the flows are far from the inertially-driven turbulence observed
  for Newtonian fluids (which usually occurs at Re on the order of 1000 for
  internal flows) and are purely-elastic in nature.  By “purely-elastic
 ” we mean driven by non-linear elastic (normal) stresses that develop in
  flowing complex fluids.  Flow through a serpentine (or wavy) channel is o
 ne such geometry where an elastic instability has been observed experiment
 ally [1].   Here we report the results or a combined numerical and experim
 ental investigation to determine the variation of the critical Weissenberg
  number (Wi) with the channel curvature [2].  Using this understanding we 
 have also proposed a novel micro-rheometer [3].  Finally\, we shall discus
 s one engineering application of elastic turbulence namely the enhancement
  of heat transfer in microfluidics applications [4].  
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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