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Phase-separating binary fluids under oscillatory shear.

Aiguo Xu1, G Gonnella, A Lamura

  • 1Istituto Nazionale per la Fisica della Materia, Unità di Bari, Università di Bari, 70126 Bari, Italy.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 6, 2003
PubMed
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Lattice Boltzmann methods reveal complex fluid segregation patterns under oscillatory shear. High frequencies lead to isotropic domain growth, while lower frequencies induce lamellar structures, mimicking steady shear effects.

Area of Science:

  • Fluid Dynamics
  • Computational Physics

Background:

  • Phase separation in binary fluid mixtures is a fundamental process.
  • Understanding domain morphology under external flow is crucial for materials science and industrial applications.

Purpose of the Study:

  • To investigate the effects of oscillatory shear flow on the segregation of binary fluid mixtures in two dimensions.
  • To analyze how oscillation frequency and viscosity influence the morphology of phase-separating domains.

Main Methods:

  • Application of lattice Boltzmann methods to simulate fluid dynamics.
  • Modeling systems governed by Navier-Stokes and convection-diffusion equations.
  • Analysis of domain growth exponents and morphological transitions.

Main Results:

Related Experiment Videos

  • At high frequencies, isotropic domain growth with exponents 2/3 (inertial) and 1/3 (diffusive) was observed.
  • Anisotropic effects and coexistence of lamellar and isotropic domains occurred when oscillation periods matched velocity profile relaxation times.
  • Convective effects at specific frequencies/viscosities can slow or halt segregation, consistent with experimental findings.
  • Very low frequencies resulted in system-wide lamellar ordering, similar to steady shear.

Conclusions:

  • Oscillatory shear flow induces rich and complex phenomenology in binary fluid mixtures.
  • Frequency and viscosity are critical parameters controlling domain morphology and segregation dynamics.
  • The simulation results offer insights into experimental observations of shear-induced phase separation.