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Measurement and Network Modeling of Liquid Permeation into Compacted Mineral Blocks.

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This study measured fluid uptake in calcium carbonate using microbalance and simulation. Fluid wetting was initially slowed by inertia but later accelerated by pore network connectivity.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Porous Media

Background:

  • Understanding fluid transport in porous materials is crucial for applications like groundwater flow and oil recovery.
  • Traditional models often simplify complex pore structures, limiting their predictive accuracy.
  • Calcium carbonate is a common geomaterial with a complex pore network.

Purpose of the Study:

  • To investigate the fluid wetting dynamics of 1,3-propandiol into compacted calcium carbonate.
  • To compare experimental measurements with simulations based on realistic pore structures.
  • To develop a model that accurately describes fluid uptake considering inertial and pore connectivity effects.

Main Methods:

  • Fluid uptake rate measured using a microbalance on a compacted calcium carbonate cube.
  • Pore structure characterized by mercury porosimetry.
  • Three-dimensional void structure generated using "Pore-Cor" software.
  • Fluid wetting simulated using an extended Lucas-Washburn equation incorporating viscous, inertial, and capillary forces.

Main Results:

  • Neither experimental nor simulated wetting matched simple hydraulic models.
  • A mathematical function was developed to account for boundary condition differences between simulation and experiment.
  • Inertial flow initially slowed wetting, particularly in larger pores.
  • Pore network connectivity accelerated wetting, showing a t(0.8) dependence.

Conclusions:

  • Fluid wetting in porous media is complex, influenced by both inertial effects and pore network topology.
  • The developed model provides a more accurate description of fluid uptake than traditional methods.
  • Connectivity plays a significant role in accelerating fluid transport in porous materials.