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Self-organized criticality in sheared suspensions.

L Corté1, S J Gerbode, W Man

  • 1Center for Soft Matter Research, New York University, 4 Washington Place, New York, New York 10003, USA.

Physical Review Letters
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

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Systems of particles in shear flow show self-organized criticality when sedimentation is introduced. Reducing sedimentation drives the system toward a critical state, marked by power-law distributions in cluster dynamics.

Area of Science:

  • Complex fluids
  • Non-equilibrium statistical mechanics
  • Soft matter physics

Background:

  • Neutrally buoyant, non-Brownian particles in shear flow can transition between irreversible and reversible states.
  • Understanding these dynamical phase transitions is crucial for predicting complex fluid behavior.

Purpose of the Study:

  • To investigate the emergence of self-organized criticality in particle suspensions under periodic shear.
  • To determine the role of particle sedimentation velocity in driving systems towards a critical state.

Main Methods:

  • Utilized a computer model to simulate particle suspensions under periodic shear.
  • Introduced a finite particle sedimentation velocity (v(s)) to the model.
  • Analyzed cluster dynamics, including lifetime and size distributions.

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Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
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Last Updated: Jun 14, 2026

Challenges in Rheological Characterization of Highly Concentrated Suspensions &#8212; A Case Study for Screen-printing Silver Pastes
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Dielectric RheoSANS &#8212; Simultaneous Interrogation of Impedance, Rheology and Small Angle Neutron Scattering of Complex Fluids
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Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
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Published on: February 22, 2018

Main Results:

  • Self-organized criticality was observed when a finite sedimentation velocity was introduced.
  • Systems evolved towards a shear-dependent critical concentration (phi(c)) as sedimentation velocity decreased.
  • Power-law distributions characterized the lifetime and size of fluctuating clusters in the critical state.
  • Experimental results corroborated the model, showing steady-state concentrations approaching phi(c) with reduced sedimentation.

Conclusions:

  • Particle sedimentation velocity is a key parameter controlling the transition to self-organized criticality in sheared suspensions.
  • Sheared particle systems can self-organize to a critical state without external tuning, driven by sedimentation.
  • The findings have implications for understanding complex fluid behavior and phase transitions in non-equilibrium systems.