Session GD: Foams
10:34 AM–12:05 PM, Monday, November 21, 2005
Hilton Chicago Room: Continental A
Chair: Michael Dennin, University of California, Irvine
Abstract ID: BAPS.2005.DFD.GD.4
Abstract: GD.00004 : Large-scale foam flows: discrete effects and limits of a continuum approach.
11:13 AM–11:26 AM
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Abstract 
Authors:
Igor Veretennikov
(University of Notre Dame)
Marius Asipauskas
(Glenn Research Center, NASA)
James Glazier
(Indiana University, Bloomington)
One might expect a continuum approach to apply to a flowing foam if all spatial scales of the flow are much larger than the size of the individual bubbles. Our experiments on two-dimensional foams flowing through constrictions and around obstacles show that this assumption often fails. Any high-stress regions in the flow cause structural changes (in particular, topological rearrangements (T1 processes)) at preferred locations, which can induce large amplitude jumps in average foam velocity and/or streamline splitting. The resulting flows differ qualitatively from continuum flows ({\it e.g.} flow velocity may be maximal at a classical stagnation point. Because topological changes always occur at the bubble scale, a continuum description cannot hold. We explain these phenomena qualitatively.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2005.DFD.GD.4