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SUMMARY:Shear Thickening in Dense Suspensions - Prof Michael Cates (DAMTP\
 , University of Cambridge)
DTSTART:20201105T181500Z
DTEND:20201105T193000Z
UID:TALK152035@talks.cam.ac.uk
CONTACT:Miroslava Novoveska
DESCRIPTION:Recent years have seen a new understanding of how dense suspen
 sions\, such as corn-starch in water\, undergo a sudden transition from a 
 flowable to a jammed state upon increasing stress. Interparticle stresses 
 overcome repulsive barriers to create frictional contacts between particle
 s\; the resulting extra constraints on particle motion cause partial or co
 mplete rigidification. So far we have a simple predictive model that captu
 res this picture for steady flows\, which I will describe. However\, new p
 hysics emerges for flows with a transverse oscillatory component (which ca
 n maintain the unjammed state at much higher flow rates than otherwise pos
 sible) and for reversing flows. If time allows I will outline recent progr
 ess towards a full constitutive model that may capture some of these effec
 ts.
LOCATION:Online
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