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SUMMARY:A hidden hydrodynamic phenomenon prevents collective motion of spo
 ntaneously spinning particles - Dr. Debasish Das\, University of Strathcly
 de
DTSTART:20221201T123000Z
DTEND:20221201T133000Z
UID:TALK191405@talks.cam.ac.uk
CONTACT:Raymond E. Goldstein
DESCRIPTION:Self-propelled particles are a fundamental constituent of acti
 ve matter\, be it biological or synthetic. Using electric fields\, researc
 hers have been able to create a model system of self-propelling particles\
 , albeit confined to two dimensions. These particles are powered by an ele
 ctrohydrodynamic instability called as Quincke rotation which converts spo
 ntaneous rotation to translation on a no-slip plane. Many such particles h
 ave been shown to interact with each other electrohydrodynamically and giv
 e rise to collective motion (Bricard et al\, Nature (2013)). \n\nNaturally
 \, this leads us to ask the question: what happens in a three-dimensional 
 fluid environment? Do the particles display collective motion\, i.e. spont
 aneously flow in a particular direction? I will show how a fundamental hyd
 rodynamic phenomenon prevents particles from showing any collective motion
  in three-dimensions. This phenomenon remains hidden as a secondary effect
  in driven systems like suspensions in shear flow and hence has not been d
 iscussed in literature. It only emerges as a leading order effect in suspe
 nsions where particles can spontaneously spin in any direction.
LOCATION:MR15\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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