Elastic Convection in Vibrated Viscoplastic Fluids

Details Elastic Convection in Vibrated Viscoplastic Fluids Elastic Convection in Vibrated Viscoplastic Fluids

2006-08-07

arxiv.org/abs/cond-mat/0608150v1

Phys. Rev. Lett. 98, 044501 (2007)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.98.044501

We observe a new type of behavior in a shear thinning yield stress fluid: freestanding convection rolls driven by vertical oscillation. The convection occurs without the constraint of container boundaries yet the diameter of the rolls is spontaneously selected for a wide range of parameters. The transition to the convecting state occurs without hysteresis when the amplitude of the plate acceleration exceeds a critical value. We find that a non-dimensional stress, the stress due to the inertia of the fluid normalized by the yield stress, governs the onset of the convective motion.

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