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Chemically-driven convective dissolution.

M Jotkar1, L Rongy1, A De Wit1

  • 1Université libre de Bruxelles (ULB), Faculté des Sciences, Nonlinear Physical Chemistry Unit, C.P. 231, 1050 Brussels, Belgium. mjotkar@ulb.ac.be lrongy@ulb.ac.be adewit@ulb.ac.be.

Physical Chemistry Chemical Physics : PCCP
|August 31, 2019
PubMed
Summary
This summary is machine-generated.

Chemical reactions can trigger convective instability and enhance solute dissolution. This study explores how A + B → C reactions create density inversions, leading to mixing and increased dissolution fluxes, beneficial for geological applications.

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Area of Science:

  • Geochemistry
  • Fluid Dynamics
  • Chemical Engineering

Background:

  • Solute dissolution in a host phase typically leads to stable density stratification if density increases monotonically.
  • Convective instability arises when density profiles become non-monotonic, creating localized mixing zones.

Purpose of the Study:

  • To investigate the convective destabilization of solute dissolution when a reaction occurs.
  • To identify critical conditions for reaction-driven convective instability.
  • To analyze the impact of reactions on dissolution fluxes.

Main Methods:

  • Theoretical analysis using linear stability.
  • Numerical simulations of reactive dissolution.
  • Comparison of analytical predictions with simulation results.

Main Results:

  • A + B → C reactions can create non-monotonic density profiles with local maxima.
  • Convective instability is triggered in regions where dense products overlie less dense solutions.
  • Increased dissolution flux is observed in the convective regime under specific conditions (ΔRCB, β).

Conclusions:

  • Chemical reactions are a key mechanism for initiating convective mixing during dissolution.
  • Reactive dissolution can significantly enhance solute transport and dissolution rates.
  • Findings have implications for geological processes and engineered systems requiring efficient mass transfer.