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Stress partition and microstructure in size-segregating granular flows.

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  • 1Sorbonne Université, UPMC Université Paris 06, UMR 7190, Institut Jean Le Rond d'Alembert, F-75005 Paris, France.

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Granular size segregation occurs when mixtures of different-sized grains separate during flow. This study uses simulations to analyze pressure and microstructure, finding kinetic pressure is a robust indicator of segregation mechanisms.

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Area of Science:

  • Physics
  • Engineering
  • Materials Science

Background:

  • Granular materials exhibit size segregation when subjected to mechanical forces.
  • Understanding segregation mechanisms is crucial for controlling granular flows.

Purpose of the Study:

  • To investigate size segregation in granular chute flows.
  • To analyze pressure distribution and microstructure in bidisperse granular flows.
  • To differentiate between gravity-induced and shear-gradient-induced segregation.

Main Methods:

  • Two-dimensional discrete numerical simulations of bidisperse granular chute flows.
  • Analysis based on theoretical models by Gray & Thornton and Hill & Tan.
  • Discrimination between contact and kinetic stresses in stress partition.

Main Results:

  • Both gravity-induced and shear-gradient-induced segregation mechanisms are supported.
  • Contact stress partition is sensitive to mixed contact definitions, impacting gravity-induced segregation conclusions.
  • Partial kinetic stress computation is robust, showing significant deviation from continuum mixture theory and dependence on flow dynamics.

Conclusions:

  • Kinetic pressure partition is a reliable indicator of segregation mechanisms in granular chute flows.
  • Microstructure may serve as a proxy for studying gravity-induced segregation.
  • Careful handling of contact stress definitions is necessary for accurate segregation analysis.