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Reactive convective-dissolution in a porous medium: stability and nonlinear dynamics.

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Chemical reactions in porous media can unexpectedly destabilize diffusive layers, accelerating convection. This occurs due to a balance between solute concentration gradients and the density of reaction products, influencing fluid dynamics.

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Area of Science:

  • Geochemistry
  • Fluid Dynamics
  • Chemical Engineering

Background:

  • Porous media are crucial in geological and industrial processes.
  • Understanding reactive transport in porous media is key to predicting system behavior.
  • Diffusive boundary layers significantly influence mass transfer and stability.

Purpose of the Study:

  • To investigate the impact of dissolution reactions on gravitational instability.
  • To analyze the nonlinear dynamic behavior of reactive-diffusive boundary layers.
  • To elucidate the mechanisms governing convection onset in chemically reactive porous media.

Main Methods:

  • Linear stability analysis to determine critical conditions for convection.
  • Numerical simulations to capture nonlinear dynamic phenomena.
  • Modeling of reactive-diffusive transport processes.

Main Results:

  • Chemical reactions can destabilize diffusive layers, accelerating convection, even with less dense products.
  • A competition between solute gradient sharpening and product density dictates layer stability.
  • Very light products can stabilize the reactive-diffusive layer.

Conclusions:

  • Dissolution reactions introduce complex dynamics to porous media flow.
  • The interplay between reaction kinetics and fluid density is critical for stability.
  • Predicting convection onset requires considering nonlinear effects of chemical reactions.