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SUMMARY:The particulars of particulates - Dr Nathalie Vriend (DAMTP\, Univ
 ersity of Cambridge)
DTSTART:20181130T130000Z
DTEND:20181130T140000Z
UID:TALK112327@talks.cam.ac.uk
CONTACT:Amélie Lamarquette
DESCRIPTION:A granular material forms a distinct and fascinating phase in 
 physics -- sand acts as a fluid as grains flow through your fingers\, the 
 fallen grains form a solid heap on the floor or may suspend in the wind li
 ke a gas. \n\nThe main challenge of studying granular materials is the dev
 elopment of constitutive models valid across scales\, from the micro-scale
  (collisions between individual particles)\, via the meso-scale (flow stru
 ctures inside avalanches) to the macro-scale (dunes\, heaps\, chute flows)
 . \n\nIn this talk\, I am highlighting three recent projects from my labor
 atory\, each highlighting physical behavior at a different scale. First\, 
 using the property of birefringence\, we are quantifying both kinetic and 
 dynamic properties in an avalanche of macroscopic particles and measure rh
 eological properties. Secondly\, we explore avalanches on an erodible bed 
 that display an intriguing dynamic intermittency between regimes. Lastly\,
  we take a closer look at aqueous (water-driven) dunes in a novel rotating
  experiment and resolve an outstanding scaling controversy between migrati
 on velocity and dune dimension.
LOCATION:LR3A\, Inglis Building\, CUED
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