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SUMMARY:Swirling a glass: wine vs. beer - Frédéric Moisy (University Par
 is-Sud)
DTSTART:20170608T120000Z
DTEND:20170608T130000Z
UID:TALK72790@talks.cam.ac.uk
CONTACT:Julius Bier Kirkegaard
DESCRIPTION:It is common knowledge that prescribing an orbital motion to a
  glass of wine generates a rotating gravity wave that comes along with a s
 wirling mean flow. This mean flow rotates in the direction of the wave and
  recirculates poloidaly (radially and vertically)\, thus permanently pushi
 ng new fluid to the surface where it aerates and releases the wine's aroma
 s.\n\nIn order to decipher the origin of this mean flow induced by a swirl
 ing wave\, wave have performed experiments using silicon oil (a fluid more
  viscous than wine - don't drink it)\, orbitally shaken in a cylinder. Ana
 lysis suggests that the axial rotation is dominated by the Stokes drift (a
  kinematic mass transport mechanism in non-homogeneous wave fields)\, wher
 eas the poloidal recirculations are essentially driven by the dynamics of 
 the oscillating boundary layers (streaming flow).\n\nNow\, what if you swi
 rl a glass of beer? This is another story...
LOCATION:MR14\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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