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Self-organized criticality in sheared suspensions

Abstract : Recent studies reveal that suspensions of neutrally buoyant non-Brownian particles driven by slow periodic shear can undergo a dynamical phase transition between a fluctuating irreversible steady state and an absorbing reversible state. Using a computer model, we show that such systems exhibit self-organized criticality when a finite particle sedimentation velocity vs is introduced. Under periodic shear, these systems evolve, without external intervention, towards the shear-dependent critical concentration ϕc as vs is reduced. This state is characterized by power-law distributions in the lifetime and size of fluctuating clusters. Experiments exhibit similar behavior and, as vs is reduced, yield steady-state values of ϕ that tend towards the ϕc corresponding to the applied shear.
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Submitted on : Monday, October 4, 2010 - 3:42:42 PM
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Laurent Corté, D.J. Pine, S.J. Gerbode, W. Man. Self-organized criticality in sheared suspensions. Physical Review Letters, American Physical Society, 2009, 103 (248301), 4 p. ⟨10.1103/PhysRevLett.103.248301⟩. ⟨hal-00523235⟩



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