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Granular shear flow dynamics and forces: experiment and continuum theory.

L Bocquet1, W Losert, D Schalk

  • 1Laboratoire de Physique de l'ENS de Lyon, UMR CNRS 5672, 46 Allée d'Italie, 69364 Lyon Cedex, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 22, 2002
PubMed
Summary

This study reveals how granular shear flow behaves in a Couette geometry, finding good agreement between experiments and a new continuum model for key flow features.

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Area of Science:

  • Physics
  • Rheology
  • Granular Materials Science

Background:

  • Granular materials exhibit complex flow behaviors distinct from fluids.
  • Understanding shear flow is crucial for predicting material transport and processing.

Purpose of the Study:

  • To analyze key features of granular shear flow.
  • To compare experimental data with a continuum model.
  • To investigate the coupling between particle motion fluctuations and mean flow properties.

Main Methods:

  • Experimental measurements using a Couette geometry.
  • Development and application of a locally Newtonian continuum model.
  • Comparison of model predictions with experimental velocity and fluctuation profiles.

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Main Results:

  • Granular flow is confined to a narrow shear band.
  • Velocity fluctuations decay exponentially away from the shear surface.
  • Effective viscosity increases rapidly near random-close packing, exceeding Enskog theory predictions.

Conclusions:

  • The developed continuum model accurately captures key granular shear flow characteristics.
  • Experimental and theoretical results show good agreement for flow profiles and shear stress independence.
  • The model successfully explains the observed coupling between fluctuations and mean flow properties.