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SUMMARY:Streaming and Sorting: Manipulating fluid and microparticles with 
 oscillating interfaces - Sascha Hilgenfeldt (University of Illinois)
DTSTART:20170517T120000Z
DTEND:20170517T130000Z
UID:TALK72721@talks.cam.ac.uk
CONTACT:Julius Bier Kirkegaard
DESCRIPTION:Microbubbles driven to oscillations at ultrasound frequencies 
 provide an exemplary system for the study of rectification effects in micr
 ofluidics: The trajectories of both fluid elements and microparticles show
  _steady_ dynamics as a result of non-trivial averaging over the oscillati
 ons. In experiments\, we demonstrate strong\, versatile _steady streaming_
  as well as the controlled application of _inertial lift forces_ for sensi
 tive microparticle separation by size. The oscillatory and steady flow com
 ponents can be understood analytically by asymptotic analysis\, and are us
 ed as input for a theory of particle lift based on a Maxey-Riley-like forc
 e balance. The predicted particle displacements match experimental observa
 tions and generalize both shear-induced migration and secondary radiation 
 forces. 
LOCATION:MR11\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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