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Related Experiment Videos

Flow of wet granular materials.

N Huang1, G Ovarlez, F Bertrand

  • 1Laboratoire de Physique Statistique, UMR 8550 CNRS, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France.

Physical Review Letters
|February 9, 2005
PubMed
Summary

This study reveals how dense particle suspensions transition from frictional to lubricated flow using the Leighton number. A critical shear rate defines flow regimes, with universal velocity profiles observed across both.

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Area of Science:

  • Rheology
  • Soft Matter Physics
  • Fluid Dynamics

Background:

  • Dense suspensions of non-Brownian particles exhibit complex flow behaviors.
  • Understanding the transition between frictional and lubricated flow is crucial for material processing and design.

Purpose of the Study:

  • To investigate the transition from frictional to lubricated flow in dense non-Brownian particle suspensions.
  • To identify the key parameter governing this transition and its impact on flow characteristics.

Main Methods:

  • Analysis of particle suspension flow dynamics.
  • Introduction and application of the Leighton number (Le) to characterize the ratio of lubrication to frictional forces.
  • Examination of shear rate, stress, and velocity profiles.

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Main Results:

  • The Leighton number (Le) dictates the transition, defining a critical shear rate for steady flow.
  • In the frictional regime, shear flow localizes.
  • The lubricated regime is non-viscous, with constant shear to normal stress ratios and universal velocity profiles in both regimes.

Conclusions:

  • The Leighton number is a critical parameter for understanding suspension flow transitions.
  • Universal velocity profiles and constant stress ratios indicate consistent flow physics across regimes.
  • Discrepancies in viscosity measurements suggest material inhomogeneity during flow.