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Related Experiment Videos

Instantaneous velocity profiles during granular avalanches.

Sylvain Courrech du Pont1, Raphaël Fischer, Philippe Gondret

  • 1Laboratoire Fluides, Automatique, Systémes Thermiques (UMR CNRS 7608), Bâtiment 502, Campus Universitaire, 91405 Orsay Cedex, France.

Physical Review Letters
|March 24, 2005
PubMed
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Granular avalanches exhibit unique exponential velocity profiles in depth, unlike steady flows. These self-similar profiles form rapidly, revealing insights into granular flow dynamics.

Area of Science:

  • Physics of granular materials
  • Fluid dynamics of non-Newtonian flows

Background:

  • Understanding granular avalanches is crucial for geohazard assessment and industrial processes.
  • Previous studies on granular flows primarily focused on steady-state conditions.

Purpose of the Study:

  • To experimentally measure and characterize the instantaneous velocity profile of granular avalanches.
  • To compare avalanche flow dynamics with established models for steady granular flows.

Main Methods:

  • Experimental measurements of instantaneous velocity profiles in granular avalanches.
  • Analysis of velocity distribution across the pile depth and width.

Main Results:

  • Observed a pure exponential decrease in velocity along the pile depth, differing from the linear profiles of steady flows.

Related Experiment Videos

  • Identified plug flow behavior across the pile width, characterized by exponential boundary layers at the walls.
  • Demonstrated that velocity profiles are self-similar and form almost instantaneously, independent of time, despite the absence of a steady state.

    • Conclusions:

    • Granular avalanches possess distinct velocity profile characteristics compared to steady granular flows.
    • The rapid self-similar formation of these profiles suggests unique dynamic mechanisms governing avalanche behavior.