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Granular flows on a dissipative base.

Michel Y Louge1, Alexandre Valance2, Paul Lancelot3

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This study on sand flows over geotextile fabric reveals unique scaling laws for granular flows. The findings differ significantly from flows on rigid surfaces, offering new insights into granular dynamics.

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Area of Science:

  • Geotechnical Engineering
  • Fluid Dynamics
  • Materials Science

Background:

  • Inclined channel flows are crucial in geological processes and engineering applications.
  • Understanding granular flow dynamics is essential for predicting landscape evolution and designing infrastructure.
  • Traditional studies often use rigid boundaries, limiting insights into energy dissipation mechanisms.

Purpose of the Study:

  • To investigate the behavior of granular flows over a compliant geotextile base.
  • To characterize the relationship between flow depth and mass flow rate.
  • To determine the solid volume fraction in the flowing granular layer.

Main Methods:

  • Utilized sensor-enabled geotextile fabric with fiber-optic Bragg gratings for strain measurement.
  • Employed particle image velocimetry (PIV) for surface velocity and high-speed imaging for velocity profiles.
  • Measured flow thickness using an oblique laser light sheet and discharge rate.
  • Conducted experiments at inclinations above and below the angle of repose.

Main Results:

  • Observed a mass flow rate scaling with flow depth to the 3/2 power above the angle of repose.
  • Found a 5/2 power scaling when flows were forced below the angle of repose.
  • Determined a mean solid volume fraction of 0.268±0.033 in the flowing layer, independent of flow conditions.

Conclusions:

  • The geotextile fabric effectively dissipates granular fluctuation energy, altering flow dynamics.
  • The observed power-law scalings differ significantly from those on rigid boundaries.
  • The findings provide a deeper understanding of granular flow behavior on compliant surfaces.