Experimental evidence of flow destabilization in a 2D bidisperse foam

Abstract

Liquid foam flows in a Hele-Shaw cell were investigated. The plug flow obtained for a monodisperse foam is strongly perturbed in the presence of bubbles whose size is larger than the average bubble size by an order of magnitude at least. The large bubbles migrate faster than the mean flow above a velocity threshold which depends on its size. We evidence experimentally this new instability and, in case of a single large bubble, we compare the large bubble velocity with the prediction deduced from scaling arguments. In case of a bidisperse foam, an attractive interaction between large bubbles induces segregation and the large bubbles organize themselves in columns oriented along the flow. These results allow to identify the main ingredients governing 2D polydisperse foam flows.

References in corpus (4)

• Deformation and flow of a two-dimensional foam under continuous shear
• Shear-Induced Stress Relaxation in a Two-Dimensional Wet Foam
• Two-dimensional flow of foam around an obstacle: force measurements
• Dissipative flows of 2D foams

Cited by in corpus (5)

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• Dissipative flows of 2D foams
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• Novel Shear Banding Phenomenon Probes Soap Film Friction