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G W Swift1, D A Geller1

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High-amplitude oscillating flow enhances thermal diffusion (Soret) separation in fluid mixtures. This occurs when lateral temperature gradients drive favorable concentration oscillations, even with minimal pressure changes.

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Area of Science:

  • Fluid dynamics
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Thermal diffusion (Soret effect) separates mixture components using temperature gradients.
  • Oscillating flow can influence separation dynamics in confined geometries.
  • Liquid solutions present unique challenges due to imperfect thermal boundary conditions and high Lewis numbers.

Purpose of the Study:

  • To investigate the enhancement of Soret separation in fluid mixtures subjected to oscillating flow and axial temperature gradients.
  • To analyze the conditions under which oscillating lateral temperature gradients amplify axial separation flux.
  • To compare separation efficiency in liquid solutions versus gas mixtures.

Main Methods:

  • Theoretical analysis of fluid flow and mass transport in a channel.
  • Modeling of oscillating flow and temperature gradients.
  • Investigation of Soret separation flux and second-law efficiency.

Main Results:

  • High-amplitude oscillating flow significantly increases axial Soret separation flux.
  • Enhancement is driven by oscillating lateral temperature gradients exceeding axial gradients.
  • Liquid solutions show reduced separation flux but also reduced remixing compared to gases.
  • Second-law separation efficiency remains high in sufficiently large channels.

Conclusions:

  • Oscillating flow offers a viable mechanism to enhance Soret separation in fluid mixtures.
  • The interplay between lateral and axial temperature gradients is crucial for maximizing separation.
  • The findings are relevant for optimizing separation processes in liquid solutions, considering practical boundary conditions.