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Turbulent mixing with physical mass diffusion.

Xinfeng Liu1, Erwin George, Wurigen Bo

  • 1Department of Applied Mathematics and Statistics, Stony Brook University, New York 11794-3600, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 29, 2006
PubMed
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Simulations of fluid mixing, driven by Rayleigh-Taylor instability, show agreement with experimental data for both miscible and immiscible fluids. Key findings highlight the impact of physical parameters and bubble merger dynamics on mixing rates.

Area of Science:

  • Fluid dynamics
  • Computational physics
  • Plasma physics

Background:

  • Rayleigh-Taylor instability is a fundamental phenomenon in fluid dynamics.
  • Accurate simulation of fluid mixing is crucial for understanding various physical processes.
  • Previous models often struggled to incorporate physical mass diffusion and surface tension accurately.

Purpose of the Study:

  • To simulate and analyze mixing rates of Rayleigh-Taylor instability with physical parameters.
  • To investigate the influence of compressibility and scale-breaking phenomena on mixing.
  • To develop and utilize tools for analyzing bubble merger processes.

Main Methods:

  • Employed an improved front tracking algorithm for enhanced simulation accuracy.
  • Incorporated physical values for mass diffusion and surface tension in simulations.

Related Experiment Videos

  • Analyzed compressibility effects, correcting for variable density.

    • Main Results:

    • Simulated mixing rates for miscible fluids matched experimental data.
    • Numerical results for immiscible fluids fell within the experimental range.
    • Compressibility was found to significantly influence mixing rates.

    Conclusions:

    • Mixing rates are significantly dependent on scale-breaking phenomena.
    • Bubble merger processes and interactions are confirmed drivers of mixing growth.
    • The improved simulation methods provide accurate predictions for fluid mixing.