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SUMMARY:Self-diffusiophoresis in the advection dominated regime - Gareth A
 lexanders\, University of Warwick
DTSTART:20120222T130000Z
DTEND:20120222T140000Z
UID:TALK36648@talks.cam.ac.uk
CONTACT:Aurelia Honerkamp-Smith
DESCRIPTION:In both biological and artificial systems\, concentration grad
 ients can serve as a convenient mechanism for manipulating particles and g
 enerating motility. Particles that interact with a solute will move along 
 its gradient\; if they themselves generate the gradient\, this mechanism p
 rovides a means of self-propulsion. We consider a version of this type of 
 motility appropriate to certain biological systems where polymeric filamen
 ts provide the concentration gradient. As the filament diffusion is small\
 , this corresponds to a regime of large Péclet number where the motion is
  dominated by the effects of fluid advection. The nature of such concentra
 tion-gradient-driven motion in the advective regime differs in certain fun
 damental respects from the same process at low Péclet number. In particul
 ar\, we show that out of four broad scenarios of steady state motion at lo
 w Péclet number\, only two remain viable in the strongly advecting limit.
  
LOCATION:MR11\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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