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SUMMARY:Dense suspension rheology\, normal stresses\, and migration - Elis
 abeth Guazzelli\, GK Batchelor Lecturer\, IUSTI Marseille
DTSTART:20110513T150000Z
DTEND:20110513T160000Z
UID:TALK31106@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:Dense or highly concentrated particulate systems are very comm
 on in several engineering fields such as civil engineering\, food or\nphar
 maceutical industry as well as in geophysical situations such as\ndebris f
 lows\, sediment transport\, and submarine avalanches. The major difficulty
  of dense particulate flows is that the grains interact both by hydrodynam
 ics interactions through the liquid and by mechanical contact. These syste
 ms thus belong to an intermediate regime between pure suspensions and gran
 ular flows.\n\nIn this talk\, we will first provide a simple review of den
 se suspension\nrheology and show that it exhibits a number of non-Newtonia
 n behaviours. We will then focus on the appearance of normal stress differ
 ences in these systems and present two new experimental determinations of 
 these differences using rotating-rod rheometry and tilted-trough flow. We 
 will also discuss particle migration from regions of high to low shear-rat
 e which can occur in these flow geometries.\n\nThis work has been done in 
 collaboration with Francois Boyer\,\nEtienne Couturier\, Olivier Pouliquen
 .
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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