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SUMMARY:Gibbs elasticity effect in foam shear flows: a non quasi-static 2D
  numerical simulation - Cantat\, I (Institut de physique de Rennes)
DTSTART:20140228T101500Z
DTEND:20140228T110000Z
UID:TALK51150@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The origin of the dissipation in liquid foams is not fully und
 erstood\, especially in the large deformation\, large velocity regime. Num
 erical simulations\, now very accurate in the quasi static regime\, are st
 ill sparse in the dissipative regime\, and are all based on restrictive as
 sumptions or very small bubbles numbers. Here we present the results obtai
 ned with 2D numerical simulations involving 500 bubbles under simple shear
 \, in a non-quasi static regime. The bubble description is kept as simple 
 as possible and the dissipation is assumed to arise from surface tension v
 ariations induced by film area variations. This model leads to a steady st
 ate stress under simple shear that is well fitted by a Herschel-Bulkley la
 w with an exponent 0.6. We show that small tension dynamical inhomogeneiti
 es induce foam structure modifications responsible for the largest part of
  the stress increase.\n
LOCATION:Seminar Room 1\, Newton Institute
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