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Density inversion in rapid granular flows: the supported regime.

N Taberlet1, P Richard, J T Jenkins

  • 1Groupe Matière Condensée et Matériaux, UMR CNRS 6626, Université de Rennes 1, 35000 Rennes, France. nt270@cam.ac.uk

The European Physical Journal. E, Soft Matter
|February 24, 2007
PubMed
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This study reveals that granular flows on bumpy surfaces form a self-supporting layer, behaving like a sliding block. This phenomenon allows for a consistent friction coefficient, crucial for understanding granular material dynamics.

Area of Science:

  • Physics
  • Geophysics
  • Materials Science

Background:

  • Understanding granular flow dynamics is crucial in various scientific and engineering fields.
  • Previous models often simplify surface interactions, neglecting the impact of surface topography.

Purpose of the Study:

  • To investigate the behavior of rapid 2D and 3D granular flows on a bumpy base.
  • To characterize the friction and flow dynamics in a supported regime.

Main Methods:

  • Numerical simulations were employed to model granular flows.
  • Analysis focused on the development of a sheared layer at the base and its effect on flow behavior.

Main Results:

  • A strongly sheared, dilute layer forms at the base, supporting the bulk flow.

Related Experiment Videos

  • Flows exhibit solid-like friction characteristics, with velocity and kinetic energy decreasing linearly.
  • An effective friction coefficient was defined, largely independent of flow mass and velocity, but strongly influenced by base bumpiness.

    • Conclusions:

    • The bumpy base and resulting agitated layer significantly influence granular flow friction.
    • Supported granular flows can achieve a steady state on inclined surfaces under specific conditions.