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 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.
Debrégeas
G
G
Institut Charles Sadron, CNRS UPR 022, 6 rue Boussingault, 67083 Strasbourg Cedex, France. debregea@ics.u-strsbg.fr
Tabuteau
H
H
di Meglio
J M
JM