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Area of Science:

  • Physical Chemistry
  • Fluid Dynamics
  • Computational Physics

Background:

  • Phase separation is a fundamental process in fluid mixtures.
  • Understanding the dynamics of ternary mixtures is complex due to multiple components.
  • Hydrodynamic effects significantly influence phase separation kinetics.

Purpose of the Study:

  • To investigate phase separation in ternary (ABC) fluid mixtures using molecular dynamics (MD) simulations.
  • To analyze the domain growth law and identify the dynamic growth exponent (ϕ).
  • To elucidate the role of hydrodynamic effects on the scaling regimes in 2D and 3D systems.

Main Methods:

  • Detailed molecular dynamics (MD) simulations were performed for ternary fluid mixtures.
  • Simulations were conducted in both 2-dimensional (d=2) and 3-dimensional (d=3) systems.
  • Hydrodynamic effects were naturally incorporated within the MD framework.

Main Results:

  • The study observed a dynamical scaling regime at late times for ternary fluid mixtures.
  • A crossover in the dynamic growth exponent (ϕ) was identified: d=2 showed ϕ = 1/3 → 1/2 → 2/3, and d=3 showed ϕ = 1/3 → 1.
  • These crossovers are attributed to the influence of hydrodynamic effects.

Conclusions:

  • Ternary fluid mixtures exhibit distinct phase separation dynamics influenced by hydrodynamic effects.
  • The observed scaling laws provide insights into the late-time behavior of these complex mixtures.
  • Current simulations did not reach the inertial hydrodynamic regime in 3D systems.