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The Diffusion of Passive Tracers in Laminar Shear Flow
08:01

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Published on: May 1, 2018

Enhancing mixing and diffusion with plastic flow.

A Libál1, C Reichhardt, C J Olson Reichhardt

  • 1Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 15, 2008
PubMed
Summary
This summary is machine-generated.

External driving and disorder in phase-separated particle mixtures create plastic flow. This flow can rapidly mix species and enhance diffusion, even without thermal fluctuations.

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Area of Science:

  • Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • Understanding particle mixture behavior is crucial in materials science.
  • Phase separation in equilibrium systems presents challenges for mixing.
  • External driving and disorder are key factors influencing material dynamics.

Purpose of the Study:

  • To investigate the mixing dynamics of two-dimensional particle mixtures.
  • To explore the effects of external driving and quenched disorder on phase-separated systems.
  • To map the mixing phase diagram based on driving and disorder parameters.

Main Methods:

  • Numerical simulations of two-dimensional particle mixtures.
  • Analysis of plastic flow under external driving and quenched disorder.
  • Characterization of meandering and mixing channel formation.

Main Results:

  • Plastic flow occurs as meandering, strongly mixing channels when driven.
  • Complete mixing of segregated species is achieved rapidly in some cases.
  • Transverse diffusion is enhanced, even without thermal fluctuations.
  • A mixing phase diagram was mapped concerning driving and disorder parameters.

Conclusions:

  • External driving and quenched disorder can induce efficient mixing in phase-separated particle systems.
  • The observed mixing mechanisms are distinct from thermal diffusion.
  • The study provides insights into controlling particle mixture behavior through external forces.