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Related Experiment Videos

Supercooled liquids under shear: theory and simulation.

Kunimasa Miyazaki1, David R Reichman, Ryoichi Yamamoto

  • 1Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 25, 2004
PubMed
Summary

Applying shear flow to supercooled fluids significantly reduces structural relaxation time and viscosity. Dynamics remain largely isotropic despite anisotropic shear, a key finding for fluid behavior under stress.

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Area of Science:

  • Soft Matter Physics
  • Non-equilibrium Statistical Mechanics
  • Computational Fluid Dynamics

Background:

  • Supercooled fluids exhibit complex dynamics near the glass transition.
  • Understanding fluid behavior under external forces like shear is crucial.
  • Mode-coupling theory provides a framework for analyzing dense liquids.

Purpose of the Study:

  • To investigate the effects of stationary shear flow on supercooled fluids.
  • To generalize mode-coupling theory for sheared systems.
  • To compare theoretical predictions with numerical simulations.

Main Methods:

  • Generalization of mode-coupling theory for stationary shear flow.
  • Derivation of nonlinear integrodifferential equations for dynamics.

Related Experiment Videos

  • Extensive numerical simulations of a 2D binary liquid under shear.

    • Main Results:

    • Shear flow drastically reduces structural relaxation time and shear viscosity.
    • Both relaxation time and viscosity decrease as a power law of shear rate (gamma).
    • Fluid dynamics exhibit near-isotropic behavior even under strong anisotropic shear flow.

    Conclusions:

    • Stationary shear flow is an effective mechanism to control dynamics in supercooled fluids.
    • The generalized mode-coupling theory accurately captures shear-induced fluid behavior.
    • Observed isotropic dynamics challenge conventional expectations for sheared systems.