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SUMMARY:Spreading of yield-stress fluids - Jean-François Joanny\, Curie I
 nstitute
DTSTART:20231006T150000Z
DTEND:20231006T160000Z
UID:TALK205963@talks.cam.ac.uk
CONTACT:Hatice Balci
DESCRIPTION:The spreading of complex fluids is essential in many industria
 l processes for example in the cosmetic industry. We study here the spread
 ing of complex fluids in two different geometries: dip coating experiments
  where a rod is pulled out of a yield stress fluid and soft blade experime
 nts where a coating film is obtained by squeezing a liquid drop with a sof
 t elastic blade. In the dip coating experiment with a yield-stress fluid\,
  we show that the thickness of the coating film does not follow the classi
 cal Landau-Levich theory which is based on the drainng of the film. Rather
  the thickness of the film is limited by the hydrodynamics of the bulk res
 ervoir. We propose scaling laws for the film thickness and discuss the cro
 ss over between thes two possible behaviors. In the soft blade experiment 
 we first study simple non-newtonian fluids an show the importance of the w
 etting length\, which measures the ize of the blade a the tip wetted by th
 e fluid. We then generalize our study to shear-thinning and normal stress 
 fluids.
LOCATION:MR2
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