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Area of Science:

  • Physical Chemistry
  • Fluid Dynamics
  • Chemical Engineering

Background:

  • Partially miscible stratifications exhibit density profiles influenced by solute dissolution.
  • Chemical reactions can alter these profiles by changing species concentrations and densities.

Purpose of the Study:

  • To theoretically investigate the impact of a reaction (A+B→C) on density profiles in partially miscible systems.
  • To classify density profiles based on species density and diffusion coefficients.
  • To predict hydrodynamic instability scenarios arising from these reaction-driven profiles.

Main Methods:

  • Theoretical analysis of density profiles in a two-phase system with a chemical reaction.
  • Parameter space exploration based on relative density and diffusion coefficient ratios.
  • Prediction of buoyancy-driven convection phenomena.

Main Results:

  • Nonreactive systems show monotonic density profiles (increasing or decreasing).
  • Reactive systems, with differential diffusivity, can generate eight unique density profiles.
  • These profiles may exhibit up to two extrema in density, near or below the reaction front.
  • The study predicts various hydrodynamic instability scenarios.

Conclusions:

  • Chemical reactions significantly diversify density profiles in partially miscible stratifications.
  • Differential diffusivity is a key factor in creating complex, non-monotonic density profiles.
  • The developed framework aids in predicting reaction-front-induced convection and instabilities.