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Bubble coarsening is reaction-limited at low temperatures, following classical Lifshitz-Slyozov-Wagner theory. At high temperatures, diffusion-limited behavior deviates from theory with increasing gas volume fraction.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physics

Background:

  • Bubble coarsening is a critical phenomenon in multiphase systems.
  • Understanding the kinetics of bubble ripening is essential for various industrial processes.

Purpose of the Study:

  • To investigate the temperature and gas volume fraction dependence of bubble ripening kinetics.
  • To validate the applicability of Lifshitz-Slyozov-Wagner (LSW) theory under different conditions.

Main Methods:

  • Molecular dynamics simulations were employed to model bubble systems.
  • Time evolution of bubble growth rates was analyzed to determine ripening kinetics.

Main Results:

  • At low temperatures, bubble growth followed a t1/2 law, consistent with reaction-limited coarsening predicted by LSW theory.
  • At high temperatures, a t1/3 law suggested diffusion-limited coarsening, but accuracy was insufficient for full LSW validation.
  • Low-temperature coarsening showed minimal gas volume fraction sensitivity up to 10%.

Conclusions:

  • Bubble coarsening is reaction-limited at low temperatures, validating LSW theory.
  • At high temperatures, diffusion-limited coarsening deviates from LSW theory with increasing gas volume fraction.
  • Mean-field approximations are valid for reaction-limited systems but not for diffusion-limited systems at higher concentrations.