Couette Flow of Two-Dimensional Foams

Abstract

We experimentally investigate flow of quasi two-dimensional disordered foams in Couette geometries, both for foams squeezed below a top plate and for freely floating foams. With the top-plate, the flows are strongly localized and rate dependent. For the freely floating foams the flow profiles become essentially rate-independent, the local and global rheology do not match, and in particular the foam flows in regions where the stress is below the global yield stress. We attribute this to nonlocal effects and show that the "fluidity" model recently introduced by Goyon {\em et al.} ({\em Nature}, {\bf 454} (2008)) captures the essential features of flow both with and without a top plate.

6 pages, 5 figures, revised version

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• Strength of Mechanical Memories is Maximal at the Yield Point of a Soft Glass
• The Jamming Perspective on Wet Foams
• Investigation of shear banding in three-dimensional foams
• Rheology of athermal amorphous solids: Revisiting simplified scenarios and the concept of mechanical noise temperature
• Topological rearrangements and stress fluctuations in quasi-two-dimensional hopper flow of emulsions
• Criticality in vibrated frictional flows at finite strain rate
• Fluidization and wall slip of soft-glassy materials by controlled surface roughness
• Nonlocal Granular Rheology: Role of Pressure and Anisotropy
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• Nonlocal elasticity near jamming
• Non-local effects in inhomogeneous flows of soft athermal disks
• Metastability at the Yield-Stress Transition in Soft Glasses
• Roughness-induced friction in liquid foams
• Rheological properties of soft-glassy flows from hydro-kinetic simulations
• Mesoscopic simulation study of wall roughness effects in micro-channel flows of dense emulsions