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Free surface waves in wall-bounded granular flows.

Stephen L Conway1, David J Goldfarb, Troy Shinbrot

  • 1Department of Chemical & Biochemical Engineering, Rutgers University, Piscataway, New Jersey 08854, USA.

Physical Review Letters
|March 14, 2003
PubMed
Summary
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Chevron-shaped waves form in granular flows near boundaries. Subsurface circulation near frictional walls drives this pattern formation, similar to fluid boundary layers.

Area of Science:

  • Physics
  • Geophysics
  • Fluid Dynamics

Background:

  • Granular flows exhibit complex behaviors near boundaries.
  • Understanding wave formation in these systems is crucial for predicting flow dynamics.

Purpose of the Study:

  • To investigate the spontaneous formation of free-surface waves in granular flows.
  • To identify the underlying mechanisms driving wave pattern development near boundaries.

Main Methods:

  • Experimental observation of granular flows in an inclined chute.
  • Analysis of wave characteristics, including shape, internal angle, and frequency.
  • Correlation of wave patterns with subsurface flow dynamics and velocity gradients.

Main Results:

Related Experiment Videos

  • Spontaneous development of chevron-shaped traveling waves observed.
  • Waves form at inclinations near the angle of repose in steady and accelerating flows.
  • Two distinct flow regimes identified with variations in internal angle and frequency.
  • Subsurface circulation near frictional walls identified as a key factor in wave generation.

    • Conclusions:

    • Free-surface wave generation in granular flows is controlled by subsurface circulation.
    • The granular boundary layer phenomenon is analogous to fluid boundary layers.
    • This finding provides insight into pattern formation in geophysical and industrial granular flows.