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Article Dans Une Revue European Physical Journal E: Soft matter and biological physics Année : 2015

Flow of foam through a convergent channel

Benjamin Dollet

Résumé

We study experimentally the flow of a foam confined as a bubble monolayer between two plates through a convergent channel. We quantify the velocity, the distribution and orientation of plastic events, and the elastic stress, using image analysis. We use two different soap solutions: a sodium dodecyl sulfate (SDS) solution, with a negligible wall friction between the bubbles and the confining plates, and a mixture containing a fatty acid, giving a large wall friction. We show that for SDS solutions, the velocity profile obeys a self-similar form which results from the superposition of plastic events, and the elastic deformation is uniform. For the other solution, the velocity field differs and the elastic deformation increases towards the exit of the channel. We discuss and quantify the role of wall friction on the velocity profile, the elastic deformation, and the rate of plastic events.
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Dates et versions

hal-01235023 , version 1 (27-11-2015)

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Benjamin Dollet, Claire Bocher. Flow of foam through a convergent channel. European Physical Journal E: Soft matter and biological physics, 2015, 38 (11), pp.123. ⟨10.1140/epje/i2015-15123-3⟩. ⟨hal-01235023⟩
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