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Wall slip of bubbles in foams

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Figure

FIG. 1. Sketch of two typical experiments to study wall slip of a liquidfoam.pushed through a narrow channel at velocity �a� Foam is sheared in a rheometer between a smooth and a roughplate moving at relative velocity U0
FIG. 3. A transformation �mapped onto� is computed, which maps the reference domainref onto the deformed physical domain �L
FIG. 4. The weak form can be viewed as the virtual work associated with aninfinitely small displacement of an interface of length L associated with aliquid domain of area A.
FIG. 5. Variation of the bubble shape �solid line� with the capillary numberCa. The dashed line represents the reference domain �ref.
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