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Deformation and flow of a two-dimensional foam under continuous shear

We investigate the flow properties of a 2D foam (a confined monolayer of jammed bubbles) submitted to a continuous shear in a Couette geometry. A strong localization of the flow at the moving inner wall is evidenced. Moreover, velocity fluctuations measurements reveal self-similar dynamical structur...

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Bibliographic Details
Published in:Physical review letters 2001-10, Vol.87 (17), p.178305-178305, Article 178305
Main Authors: Debrégeas, G, Tabuteau, H, di Meglio, J M
Format: Article
Language:English
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Summary:We investigate the flow properties of a 2D foam (a confined monolayer of jammed bubbles) submitted to a continuous shear in a Couette geometry. A strong localization of the flow at the moving inner wall is evidenced. Moreover, velocity fluctuations measurements reveal self-similar dynamical structures consisting of clusters of bubbles moving coherently. A stochastic model is proposed where bubbles rearrangements are activated by local stress fluctuations produced by the shearing wheel. This model gives a complete description of our observations and is also consistent with available data on granular shear bands.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.87.178305