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Pore Transport and Ion-Pair Transport

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
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Related Experiment Video

Updated: Sep 15, 2025

Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography
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Deciphering Solute and Reactive Transport in Triple Porosity Systems: Etched Rock Core Experiments and Numerical

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Environmental Science & Technology
|July 14, 2025
PubMed
Summary

Understanding solute transport in triple porosity systems is crucial. Positron emission tomography (PET) imaging revealed how flow rate and fracture aperture impact solute exchange and reactivity in these complex subsurface environments.

Keywords:
CarbonatesCore floodingHydrogeologyImagingKarstNumerical simulationsReactive transportTriple porosity

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Area of Science:

  • Geosciences
  • Environmental Science
  • Chemical Engineering

Background:

  • Solute and reactive transport in triple porosity systems (conduits, fractures, rock matrix) are vital for subsurface applications.
  • System heterogeneity and solute exchange cause anomalous transport, like early arrivals and long residence times.
  • Direct observation of subsurface transport mechanisms remains a significant challenge.

Purpose of the Study:

  • To directly visualize and understand solute transport mechanisms in triple porosity systems.
  • To investigate the influence of flow rate and fracture aperture on solute exchange and reactivity.
  • To elucidate the impact of different flow conditions on solute and mineral precipitate distributions.

Main Methods:

  • Utilized etched dolostone cores with controlled geometry for reactive transport experiments.
  • Employed positron emission tomography (PET) imaging for direct visualization of solute transport.
  • Conducted numerical simulations to analyze fracture aperture effects and flow dynamics.

Main Results:

  • Flow rate significantly controls solute exchange between conduits and fractures/matrix.
  • PET imaging and experiments showed distinct solute/precipitate distributions under varying flow inertia.
  • Numerical simulations confirmed fracture aperture's role in modulating exchange and identified 3D recirculation zones enhancing reactivity at higher flow rates.

Conclusions:

  • Tracer breakthrough curves can exhibit multi-peak patterns due to increased exchange.
  • The integrated approach of etched core experiments, PET imaging, and simulations enhances understanding of reactive transport in triple porosity media.
  • Findings provide critical insights into subsurface processes influenced by complex pore structures and flow dynamics.