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Segregation in binary mixtures under gravity.

J T Jenkins1, D K Yoon

  • 1Department of Theoretical and Applied Mechanics, Cornell University, Ithaca, New York 14853, USA.

Physical Review Letters
|May 15, 2002
PubMed
Summary
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Binary mixtures segregate in gravity due to size or mass differences. Kinetic theory and simulations reveal simple criteria for this phenomenon in spheres and disks.

Area of Science:

  • Physics
  • Statistical Mechanics
  • Fluid Dynamics

Background:

  • Gravitational segregation is a key phenomenon in diverse systems.
  • Understanding particle mixture behavior under external forces is crucial.

Purpose of the Study:

  • To investigate segregation in binary mixtures under gravity.
  • To derive segregation criteria using kinetic theory.

Main Methods:

  • Application of kinetic theory for binary mixtures.
  • Analysis of segregation for spherical and disk-shaped particles.
  • Validation through numerical simulations.

Main Results:

  • Identification of simple segregation criteria based on particle properties.

Related Experiment Videos

  • Demonstration of size and/or mass influence on segregation.
  • Confirmation of theoretical predictions via simulations.

    • Conclusions:

    • Kinetic theory effectively predicts segregation in binary mixtures.
    • Segregation phenomena in gravitational fields are well-characterized by derived criteria.
    • The study provides a foundational understanding for granular material behavior.