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Related Experiment Videos

Crossover between equilibrium and shear-controlled dynamics in sheared liquids.

L Angelani1, G Ruocco, F Sciortino

  • 1Dipartimento di Fisica and INFM, Università di Roma La Sapienza, Piazzale Aldo Moro 2, 00185 Rome, Italy.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 7, 2003
PubMed
Summary

This study reveals a critical temperature line in shear flow liquids. Below this line, both temperature and shear rate control liquid dynamics; above it, shear flow effects diminish.

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Area of Science:

  • Computational physics
  • Soft matter physics
  • Fluid dynamics

Background:

  • Understanding liquid behavior under external forces is crucial.
  • Shear flow significantly alters liquid properties.
  • Distinguishing equilibrium from non-equilibrium states is key.

Purpose of the Study:

  • To investigate the influence of shear flow on a Lennard-Jones liquid.
  • To identify the boundary between equilibrium and shear-controlled regimes.
  • To analyze the relationship between temperature, shear rate, and liquid dynamics.

Main Methods:

  • Numerical simulations of a monatomic Lennard-Jones liquid.
  • Systematic variation of temperature (T) and shear rate (γ).
  • Analysis of dynamic and thermodynamic observables.

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Main Results:

  • A distinct phase boundary line, T(γ), was identified in the (T, γ) plane.
  • This line separates equilibrium from shear-controlled dynamics.
  • Structural relaxation time (τ(α)) scales as γ⁻¹ along the boundary.

Conclusions:

  • The identified line T(γ) is a critical determinant of liquid behavior under shear.
  • Liquid dynamics are shear-independent above T(γ).
  • Below T(γ), both temperature and shear rate jointly govern particle motion and system properties.