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This study refines the shadowgraph method for precise Fick diffusion coefficient (D11) measurements in binary fluid mixtures. Strategies are developed for thermodiffusion experiments, improving accuracy in confined or advected systems.

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Area of Science:

  • Thermodynamics
  • Fluid Dynamics
  • Physical Chemistry

Background:

  • Accurate determination of the Fick diffusion coefficient (D11) is crucial for understanding binary fluid mixtures.
  • Existing methods may face challenges with confinement and advection in thermodiffusion experiments.

Purpose of the Study:

  • To develop and validate the shadowgraph method for routine, accurate determination of D11 in binary fluid mixtures.
  • To establish measurement and data evaluation strategies for thermodiffusion experiments, accounting for confinement and advection.

Main Methods:

  • Utilized the shadowgraph technique to study two binary liquid mixtures: 1,2,3,4-tetrahydronaphthalene/n-dodecane (positive Soret coefficient) and acetone/cyclohexane (negative Soret coefficient).
  • Analyzed the dynamics of non-equilibrium concentration fluctuations.
  • Applied data evaluation procedures informed by recent theoretical advancements.

Main Results:

  • Demonstrated the suitability of the shadowgraph method for accurate D11 determination in binary mixtures.
  • Developed robust data evaluation strategies applicable to various experimental configurations, including those with confinement and advection.
  • Successfully measured D11 for the selected mixtures, considering their distinct Soret coefficients.

Conclusions:

  • The refined shadowgraph method offers a reliable approach for routine D11 measurements.
  • The developed strategies enhance the accuracy of thermodiffusion experiments, even under complex conditions.
  • This work provides a foundation for more precise studies of diffusion in fluid mixtures.