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SUMMARY:Mixing hot and cold with sound - Greg Chini (University of New Ham
 pshire)
DTSTART:20220308T143000Z
DTEND:20220308T153000Z
UID:TALK170681@talks.cam.ac.uk
DESCRIPTION:The study of acoustic streaming\, in which the nonlinear inter
 action of time-periodic sound waves drives time-mean flows\, dates back to
  the work of Lord Rayleigh. Surprisingly\, when an acoustic wave interacts
  with a thermally stratified fluid\, a distinct\, much stronger type of st
 reaming can occur. We uncover the physical origin of this strong streaming
  by analyzing the dynamics induced by a standing acoustic wave in a gas-fi
 lled channel with walls maintained at differing&nbsp\;temperatures. In con
 trast with Rayleigh streaming\, the emergent mean flow has an amplitude co
 mparable to that of the acoustic wave\, leading to two-way coupling betwee
 n the wave and streaming that we capture using multiscale asymptotic analy
 sis. Although the flow is acoustically-driven and buoyancy forces are not 
 included\, the streaming temperature field superficially resembles that ar
 ising in Rayleigh-Benard convection. The velocity field differs\, however\
 , being strongly confined to the periphery of the convection cells. We elu
 cidate the physical origin of this flow pattern and quantify the forced co
 nvective heat transport accomplished by the streaming as a function of the
  domain aspect ratio.
LOCATION:Seminar Room 1\, Newton Institute
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