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Superstable granular heap in a thin channel.

Nicolas Taberlet1, Patrick Richard, Alexandre Valance

  • 1GMCM, Université Rennes 1, Batiment 11A, 35042 Rennes, France.

Physical Review Letters
|February 3, 2004
PubMed
Summary
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Researchers discovered a new granular flow regime. Superstable heaps (SSH) form at high flow rates, with stability influenced by channel width and sidewall friction, not grain size.

Area of Science:

  • Physics
  • Geophysics
  • Materials Science

Background:

  • Granular flows are common in nature and industry.
  • Understanding the stability of granular heaps is crucial for predicting avalanches and designing structures.

Purpose of the Study:

  • To experimentally observe and characterize a new regime of granular flow in an inclined channel.
  • To investigate the factors contributing to the unusual stability of granular heaps formed under specific flow conditions.

Main Methods:

  • Experimental observation of granular flows in a flow-rate-controlled inclined channel.
  • Systematic variation of channel width (W) to assess its impact on heap properties.
  • Development of a depth-averaged model incorporating Coulomb friction.

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Main Results:

  • A new flow regime was identified, characterized by high flow rates leading to the formation of superstable heaps (SSH).
  • The angle of SSH was found to be significantly higher than typical granular heaps.
  • Heap stability was strongly dependent on channel width (W) and sidewall friction.
  • A theoretical model confirmed that the SSH angle scales with the ratio of height (h) to channel width (W).
  • Grain size was found to have no significant effect on SSH properties.

Conclusions:

  • The unusual stability of SSH is attributed to the interaction between the flowing granular layer and the channel sidewalls.
  • The findings provide a new understanding of granular flow dynamics and heap stability.
  • The developed model offers a predictive tool for granular flow behavior in confined geometries.