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Article Dans Une Revue Physical Review Letters Année : 2009

Self-organized criticality in sheared suspensions


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.



Dates et versions

hal-00523235 , version 1 (04-10-2010)



Laurent Corté, D.J. Pine, S.J. Gerbode, W. Man. Self-organized criticality in sheared suspensions. Physical Review Letters, 2009, 103 (248301), 4 p. ⟨10.1103/PhysRevLett.103.248301⟩. ⟨hal-00523235⟩
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