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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

Avalanche dynamics on a rough inclined plane.

Tamás Börzsönyi1, Thomas C Halsey, Robert E Ecke

  • 1Condensed Matter & Thermal Physics and Center for Nonlinear Studies, Los Alamos National Lab, New Mexico 87545, USA. btamas@szfki.hu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 4, 2008
PubMed
Summary

Avalanche dynamics change significantly with grain shape. Irregular particles create faster, larger avalanches where particles can exceed front speed, unlike spherical beads.

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Area of Science:

  • Granular physics
  • Geophysics
  • Material science

Background:

  • Avalanche behavior in granular materials is crucial for understanding natural phenomena and industrial processes.
  • Previous studies often focused on idealized spherical particles, limiting understanding of real-world granular flows.

Purpose of the Study:

  • Investigate the effect of grain shape irregularity on the dynamics of gravitationally driven granular avalanches.
  • Correlate avalanche properties (velocity, area, height) with grain morphology.
  • Develop predictive tools for avalanche behavior based on material properties.

Main Methods:

  • Experimental investigation of granular avalanches on a rough inclined plane.
  • Systematic variation of grain shapes from spherical to highly anisotropic.
  • Measurement of avalanche front velocity, area, height, and particle speeds.
  • Analysis of avalanche profiles and correlation with flow parameters.

Main Results:

  • Increased grain shape irregularity leads to faster, larger avalanches.
  • For irregular grains, particle speeds can exceed avalanche front speed ('overturning' avalanches).
  • Dimensionless avalanche height, particle-to-front speed ratio, and speed growth rate increase linearly with avalanche size and bulk angle of repose (theta r).

Conclusions:

  • Grain shape irregularity is a critical factor determining avalanche dynamics.
  • The study provides quantitative relationships linking grain shape to avalanche properties.
  • A depth-averaged theoretical model captures key aspects of avalanche motion, including distinct flow regimes.