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Related Experiment Videos

Longitudinal vortices in granular flows.

Y Forterre1, O Pouliquen

  • 1Institut Universitaire des Systèmes Thermiques et Industriels, 5 rue Enrico Fermi, 13453 Marseille cedex 13, France.

Physical Review Letters
|June 21, 2001
PubMed
Summary
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Researchers observed a new instability in rapid granular flows. This instability, characterized by surface deformation, is linked to the formation of longitudinal vortices driven by granular temperature.

Area of Science:

  • Physics
  • Geophysics
  • Fluid Dynamics

Background:

  • Rapid granular flows are common in geophysical phenomena and industrial processes.
  • Understanding the dynamics of these flows, particularly instabilities, is crucial for predicting and controlling them.
  • Previous studies have focused on different aspects of granular flow, but transverse surface instabilities in rough inclined planes remain less explored.

Purpose of the Study:

  • To identify and characterize a novel instability in rapid granular flows down rough inclined planes.
  • To investigate the relationship between surface deformation and internal flow dynamics.
  • To propose a mechanism for the observed instability based on experimental evidence.

Main Methods:

  • Experimental setup involving rapid granular flows down rough inclined planes.

Related Experiment Videos

  • High-speed imaging to observe surface deformation and measure velocities.
  • Analysis of surface velocity data to infer internal flow structures.

    • Main Results:

    • A regular transverse deformation of the flow's free surface was observed under specific conditions (high inclination and flow rates).
    • Surface velocity measurements indicated the presence of longitudinal vortices within the granular flow.
    • The instability appears to be directly linked to the formation of these vortices.

    Conclusions:

    • A new instability in rapid granular flows has been identified and characterized.
    • The instability is associated with the formation of longitudinal vortices.
    • A mechanism involving granular temperature is proposed to explain the vortex formation.