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SUMMARY:Active versus passive bundling\, irreversible entrapment by roller
 s\, and fundamental solutions to the Stokes equations - Alex Chamolly (Uni
 versity of Cambridge)
DTSTART:20191121T130000Z
DTEND:20191121T140000Z
UID:TALK135070@talks.cam.ac.uk
CONTACT:Anne Herrmann
DESCRIPTION:In this seminar I will be talking about various results from m
 y PhD.\n\nI will begin with an APS-style 10 minute presentation of my work
  on the active versus passive bundling of flagella. In this work we catego
 rise the various physical effects that contribute to the formation of a fl
 agellar bundle\, and derive a minimal model that gives us an understanding
  of their respective importance in the bundling process. We find that pass
 ive effects\, ie. those due to the fact that a finite cell body is transla
 ting\, dominate over hydrodynamic interactions for most parameter configur
 ations.\n\nNext I will briefly present some mathematical results that emer
 ged as a byproduct of this project. Specifically\, we derived new expressi
 ons for the flow due to rotlet singularities near a no-slip sphere\, that 
 are more useful in numerical calculations and physically intuitive than ex
 isting formalisms.\n\nFinally I will present to you some recently finished
  work on the irreversible hydrodynamic entrapment of cargo particles by su
 rface rollers that was done in collaboration with Soichiro Tottori in the 
 Cavendish Laboratory. We analysed an irreversible hydrodynamic trapping ef
 fect\, analogous to deterministic lateral displacement\, by which microsco
 pic rollers can transport cargo near an interface. Our work features a pha
 se diagram for feasible parameter configurations\, as well as two theoreti
 cal models explaining the physical mechanism.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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