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SUMMARY:Flow and Arrest of Very Dense Suspensions - Professor Mike Cates (
 DAMTP)
DTSTART:20161124T113000Z
DTEND:20161124T123000Z
UID:TALK67942@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:At very high solid volume fractions\, many dense suspensions u
 ndergo shear thickening. (Wet corn starch is a good example.) Such suspens
 ions flow freely at low stresses but jam up completely if the stress is in
 creased.  I will outline a recent theory that explains this sudden transit
 ion in terms of a smooth stress dependence of the fraction of interparticl
 e contacts at which friction acts. The resulting flow curves (stress vs sh
 ear rate) at first sight suggest that the system could form steady shear-b
 ands oriented along the vorticity direction with coexistence of  high stre
 ss and low stress material at equal shear rate. Experimentally this is not
  seen and I will outline tentative arguments\, based on the same model\, f
 or why the steady shear-banded state might always be replaced by an unstea
 dy flow.\n
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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