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Related Experiment Videos

Core precession and global modes in granular bulk flow.

Denis Fenistein1, Jan-Willem van de Meent, Martin van Hecke

  • 1Kamerlingh Onnes Lab, Leiden University, Post Office box 9504, 2300 RA Leiden, Netherlands.

Physical Review Letters
|April 12, 2006
PubMed
Summary

Researchers discovered a new core precession transition in granular flows. This occurs when shear zones change from reaching the surface in shallow layers to meeting below the surface in deep layers, altering flow structure and surface velocity symmetry.

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Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Granular materials exhibit complex flow behaviors under shear.
  • Understanding the transition in flow structures is crucial for predicting material response.

Purpose of the Study:

  • To investigate the novel transition to core precession in granular flows.
  • To characterize the relationship between layer depth and 3D flow structure.

Main Methods:

  • Experiments were conducted using a split-bottomed shear cell.
  • Analysis focused on the 3D flow structure and surface velocity measurements.

Main Results:

  • A transition to core precession was observed, dependent on layer depth.
  • Shallow layers showed shear zones reaching the free surface; deep layers showed shear zones meeting below the surface.

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  • Surface velocities exhibited a change in symmetry corresponding to the transition.

    • Conclusions:

    • Three distinct granular flow regimes were identified based on layer depth.
    • The study reveals a simple yet robust method for controlling granular flow dynamics.