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SUMMARY:Gas-bubble electrophoresis - an unresolved discrepancy between the
 ory and experiments - John Harper (Victoria University of Wellington\, New
  Zealand)
DTSTART:20110524T120000Z
DTEND:20110524T130000Z
UID:TALK31079@talks.cam.ac.uk
CONTACT:Dr Ed Brambley
DESCRIPTION:If an electric field E is imposed on a liquid containing both 
 a small object and dissolved ions\, the object's velocity changes. That ef
 fect is called electrophoresis. If the object is solid and the solution di
 lute\, the theory assumes Stokes flow and it agrees with the experiments. 
 But if the object is a gas bubble with a clean surface\, no existing theor
 y agrees with the experiments. The discrepancy between experiment and theo
 ry is of order E squared.\n\nTwo possible ways to explain that would seem 
 to be Joule heating (because current flows in the liquid) and Oseen flow (
 because the experimental bubble Reynolds numbers were not negligibly small
 )\, but neither seems to give a large enough effect. Is something else goi
 ng on that's not in the theory? 
LOCATION:MR4\, CMS
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