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Area of Science:

  • Porous materials science
  • Chemical reaction engineering
  • Fluid dynamics

Background:

  • Reactions at fluid-solid interfaces are crucial for porous materials.
  • Solute transport limitations in pores can decrease reaction rates.
  • The effect of chaotic mixing on surface reactions in porous media is not well understood.

Purpose of the Study:

  • To investigate the impact of pore-scale chaotic mixing on reaction efficiency.
  • To determine if chaotic mixing enhances reaction rates at fluid-solid interfaces.
  • To understand the mechanisms behind enhanced reaction rates due to chaotic mixing.

Main Methods:

  • Numerical simulations of fluid flow and solute transport in porous media.
  • Analysis of reaction rates under chaotic and nonchaotic flow conditions.
  • Modeling reaction rates using diffusive first-passage times and stochastic restart processes.

Main Results:

  • Pore-scale chaotic mixing significantly increases reaction efficiency compared to nonchaotic flows.
  • Reaction rates are accurately described by diffusive first-passage times influenced by Lagrangian chaos.
  • A characteristic scaling of reaction efficiency with Péclet number was observed under chaotic mixing.

Conclusions:

  • Chaotic mixing is a key factor in enhancing reaction efficiency at fluid-solid interfaces in porous materials.
  • The findings suggest that reaction rates are largely independent of flow topology in chaotic regimes.
  • This research highlights the broad relevance of chaotic mixing for various porous material applications.