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Simulation of phase separation with temperature-dependent viscosity using lattice Boltzmann method.

Heping Wang1, Duyang Zang1, Xiaoguang Li1

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The European Physical Journal. E, Soft Matter
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Summary
This summary is machine-generated.

This study explores phase separation in binary fluids with temperature-dependent viscosity using lattice Boltzmann methods. Findings guide optimal temperature ranges for achieving desired phase structures, crucial for materials science applications.

Keywords:
Flowing Matter: Liquids and Complex Fluids

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Computational physics

Background:

  • Phase separation is critical in materials science.
  • Understanding temperature-dependent viscosity effects is essential for controlling material properties.
  • Lattice Boltzmann methods offer a powerful tool for simulating complex fluid phenomena.

Purpose of the Study:

  • To investigate phase separation and pattern formation in binary fluids with temperature-dependent viscosity.
  • To analyze the influence of viscosity-temperature relations on phase behavior.
  • To provide guidance for optimizing temperature ranges for specific phase structures.

Main Methods:

  • Coupled lattice Boltzmann method (LBM) simulation.
  • Introduction of viscosity-temperature relation into LBM.
  • Analysis of growth kinetics using structure factor and phase ratios.

Main Results:

  • Increased initial viscosity and viscosity-temperature coefficient, or decreased thermal diffusion, orient growth fronts.
  • Droplet-type and lamellar phase structures can be controlled by tuning parameters.
  • Two temporal regimes (spinodal decomposition and domain growth) were identified.

Conclusions:

  • Temperature-dependent viscosity significantly impacts phase separation dynamics.
  • Precise control over initial viscosity, thermal diffusivity, and viscosity-temperature coefficient allows for targeted structure formation.
  • The study offers practical insights for designing materials with specific phase separation characteristics.