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Related Experiment Videos

Phase separation in binary fluid mixtures with continuously ramped temperature.

M E Cates1, J Vollmer, A Wagner

  • 1School of Physics, The University of Edinburgh, James Clerk Maxwell Building, The King's Buildings, Mayfield Road, Edinburgh EH9 3JZ, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|July 23, 2003
PubMed
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Binary fluid mixtures demixing under gravity exhibit oscillations due to competing nonlinearities. These phenomena are observed when both density inversions and diffusive instability are significant, impacting heat capacity and optical properties.

Area of Science:

  • Thermodynamics
  • Fluid Dynamics
  • Materials Science

Background:

  • Binary fluid mixtures under gravity can be driven into a two-phase region by temperature changes.
  • Understanding demixing dynamics is crucial for various applications, including materials processing and chemical engineering.

Purpose of the Study:

  • To investigate the demixing of a binary fluid mixture under gravity as temperature is ramped.
  • To analyze the interplay of two competing nonlinearities: density inversions and diffusive instability.
  • To explain observed oscillations in heat capacity and optical properties.

Main Methods:

  • Simulating isothermal demixing of a binary fluid mixture under gravity.
  • Analyzing the influence of nonlinear density inversions (analogous to the Bénard problem).

Related Experiment Videos

  • Examining intrinsic diffusive instability leading to nucleation or spinodal decomposition.

    • Main Results:

    • Experimental results show oscillations in heat capacity and optical properties.
    • These oscillations occur across a range of temperature ramp parameters.
    • The study identifies conditions where both nonlinearities significantly influence the demixing process.

    Conclusions:

    • Observed oscillations in binary fluid mixtures are attributed to the combined effects of density inversion and diffusive instability.
    • The findings provide insights into the complex dynamics of phase separation in driven systems.
    • This research contributes to a deeper understanding of nonlinear phenomena in fluid mixtures.