Experimental evidence of flow destabilization in a 2D bidisperse foam

Details Experimental evidence of flow destabilization in a 2D bidisperse foam Experimental evidence of flow destabilization in a 2D bidisperse foam

2006-04-07

arxiv.org/abs/cond-mat/0604199v1

Physical Review E 73 (2006) 011505

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevE.73.011505

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.

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