Rheology of Weakly Vibrated Granular Media

Abstract

We probe the rheology of weakly vibrated granular flows as function of flow rate, vibration strength and pressure by performing experiments in a vertically vibrated split-bottom shear cell. For slow flows, we establish the existence of a novel vibration dominated granular flow regime, where the driving stresses smoothly vanish as the driving rate is diminished. We distinguish three qualitatively different vibration dominated rheologies, most strikingly a regime where the shear stresses no longer are proportional to the pressure.

14 pages, 19 figures, submitted to PRE

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• An Itinerant Oscillator model with cage inertia for mesorheological granular experiments
• Criticality at finite strain rate in fluidized soft glassy materials
• Anisotropy of Weakly Vibrated Granular Flows
• Getting hotter by heating less: How driven granular materials dissipate energy in excess
• Slow and Long-ranged Dynamical Heterogeneities in Dissipative Fluids
• Giant fluctuations in the flow of fluidised soft glassy materials: an elasto-plastic modelling approach