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Related Experiment Videos

Two-dimensional model of phase segregation in liquid binary mixtures.

N Vladimirova1, A Malagoli, R Mauri

  • 1Department of Chemical Engineering, The City College of CUNY, New York, New York 10031, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|April 24, 2002
PubMed
Summary

Hydrodynamic effects significantly influence liquid mixture phase separation. Convection drives early stages, while diffusion dominates later stages, with transition timing dependent on the Peclet number.

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Area of Science:

  • Physical Chemistry
  • Fluid Dynamics
  • Materials Science

Background:

  • Phase separation in liquid mixtures is a fundamental process.
  • Understanding the kinetics of late-stage phase separation is crucial for materials design.
  • Hydrodynamic effects can significantly alter separation dynamics.

Purpose of the Study:

  • To investigate the hydrodynamic effects on the late-stage kinetics of phase separation in liquid mixtures.
  • To elucidate the interplay between convection and diffusion during phase separation.
  • To correlate simulation results with experimental observations.

Main Methods:

  • Utilized Model H for theoretical analysis.
  • Employed numerical simulations to study mass and momentum transport.

Related Experiment Videos

  • Investigated the influence of the Peclet number (alpha) on phase separation dynamics.

    • Main Results:

    • Phase separation in low viscosity mixtures is primarily convection-driven in early stages, showing linear domain growth.
    • A transition to diffusion-driven growth occurs as interfaces sharpen, with domain size increasing as t(n), where 1/3 < n < 1/2.
    • Higher Peclet numbers delay this transition to larger domain sizes and later times.

    Conclusions:

    • Hydrodynamic effects, particularly convection, play a dominant role in the early kinetics of phase separation.
    • The transition from convection- to diffusion-driven regimes is dependent on the Peclet number.
    • The findings provide a theoretical explanation for experimentally observed fast phase separation kinetics.