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SUMMARY:Transport and deformation of an elastic filament in a cellular flo
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DTSTART:20120608T101500
DTSTAMP:20260924T173800Z
UID:337df10697d16de49085858bc0d69be1a6f132d4a10e79ca06f17175
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Nawal Quennouz\, PMMH ESPCI Paris\nThe interaction of a de
 formable body with a viscous flow is found in a wide range of situations\,
  ranking from biology to polymer science. Numerous studies both experiment
 al and theoretical have been devoted to this fi eld\, but a large number o
 f questions remains to be answered. The experimental study of simple model
  systems\, such as homogeneous elastic fi bers\, evolving in a controlled 
 flow geometry\, could help understanding the complex interactions that gov
 ern the dynamics. Here we address the fundamental question of the modi cat
 ion of the transport of an object induced by its deformation in a viscous 
 flow as studied by Young et al. In this context\, we experimentally study 
 the deformation and transport of an isolated elastic fi ber in a viscous c
 ellular flow at low Reynolds number\, namely a lattice of counter-rotative
  vortices. We show that the fi ber can buckle when approaching a stagnatio
 n point. By tuning either the flow or the fiber properties\, we measure th
 e onset of this buckling instability. The buckling threshold is determined
  by the relative intensity of viscous and elastic forces\, the elasto-visc
 ous number Sp. We compare our experimental results with the numerical simu
 lations by Young et al and we discuss the origins of the differences betwe
 en them.
LOCATION:CM011
STATUS:CONFIRMED
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