Velocity Profiles in Slowly Sheared Bubble Rafts

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Velocity Profiles in Slowly Sheared Bubble Rafts, John Lauridsen, Gregory Chanan, and Michael Dennin, PRL vol.93 018303 (2004) [1]


Foam, Yield Stress, Jamming, Couette Viscometer

Original Abstract from Paper

"Measurements of average velocity profiles in a bubble raft subjected to slow, steady shear demonstrate the coexistence between a flowing state and a jammed state similar to that observed for three-dimensional foams and emulsions [P. Coussot , Phys. Rev. Lett. 88, 218301 (2002)]. For sufficiently slow shear, the flow is generated by nonlinear topological rearrangements. We report on the connection between this short-time motion of the bubbles and the long-time averages. We find that velocity profiles for individual rearrangement events fluctuate, but a smooth, average velocity is reached after averaging over only a relatively few events."

Soft Matter

This study looks at the jamming of a flow of bubble rafts in a Couette viscometer.