Gas-bubble electrophoresis - an unresolved discrepancy between theory and experiments

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• John Harper (Victoria University of Wellington, New Zealand)
• Tuesday 24 May 2011, 13:00-14:00
• MR4, CMS.

If you have a question about this talk, please contact Dr Ed Brambley.

If an electric field E is imposed on a liquid containing both a small object and dissolved ions, the object’s velocity changes. That effect is called electrophoresis. If the object is solid and the solution dilute, 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 theory agrees with the experiments. The discrepancy between experiment and theory is of order E squared.

Two 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 going on that’s not in the theory?

This talk is part of the Monday Mechanics Seminars (DAMTP) series.

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