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Stress and large-scale spatial structures in dense, driven granular flows.

Allison Ferguson1, Bulbul Chakraborty

  • 1Martin Fisher School of Physics, Brandeis University, Mailstop 057, Waltham, MA 02454-9110, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 21, 2006
PubMed
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Dynamical heterogeneities form linear chains in granular flows, carrying stress. These structures

Area of Science:

  • Physics
  • Complex Systems
  • Statistical Mechanics

Background:

  • Granular materials exhibit complex behaviors under flow.
  • Understanding stress distribution is crucial for predicting material failure.

Purpose of the Study:

  • Investigate the emergence of large-scale dynamical heterogeneities in driven granular systems.
  • Analyze the role of particle interactions and correlations in stress transport.

Main Methods:

  • Simulations of steady-state gravity-driven flows.
  • Modeling inelastically colliding hard disks.
  • Analysis of particle collision frequency and momentum transfer.

Main Results:

  • Observed formation of large-scale linear particle chains with high collision frequency.

Related Experiment Videos

  • Identified dynamical correlation between momentum transfer and collision time within these chains.
  • Demonstrated that these chains carry significant collisional stress.
  • Found that the lifetime of stress heterogeneities increases as flow velocity decreases toward jamming.

    • Conclusions:

    • Linear particle chains are key structures for stress transport in granular flows.
    • The dynamics of these heterogeneities resemble slow dynamics in supercooled liquids.
    • Results provide insights into jamming transitions and stress propagation in disordered systems.