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Related Experiment Videos

Three-dimensional shear in granular flow.

Xiang Cheng1, Jeremy B Lechman, Antonio Fernandez-Barbero

  • 1The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA.

Physical Review Letters
|February 21, 2006
PubMed
Summary
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Granular shear flow transitions from a stationary core to torsional failure above a critical height. This study reveals distinct radial and axial shear behaviors in granular materials.

Area of Science:

  • Physics
  • Rheology
  • Materials Science

Background:

  • Granular materials exhibit complex flow behaviors under shear stress.
  • Understanding shear flow evolution is crucial for predicting material response in various applications.

Purpose of the Study:

  • To investigate the height-dependent evolution of granular shear flow.
  • To identify the transition in shear behavior within a split-bottom Couette cell.

Main Methods:

  • Particle tracking velocimetry (PTV)
  • Magnetic-resonance imaging (MRI)
  • Large-scale numerical simulations

Main Results:

  • A characteristic height (H*) marks a transition in shear flow.

Related Experiment Videos

  • Below H*, a stationary core is observed.
  • Above H*, additional axial shear due to torsional failure emerges.

    • Conclusions:

    • Granular shear flow is height-dependent, transitioning at H*.
    • Radial and axial shear profiles exhibit distinct behaviors.
    • Torsional failure contributes to axial shear at greater heights.