Pore-Scale Mixing and the Evolution of Hydrodynamic Dispersion in Porous Media

Pore-Scale Mixing and the Evolution of Hydrodynamic Dispersion in Porous Media

Alexandre Puyguiraud, Philippe Gouze, and Marco Dentz

Direct numerical simulations (Figure) show that solute dispersion in a porous media evolves with time, and depends on the spatial distribution of the fluid velocity, which is controlled by the geometry and structure of the pore space. The detailed large-scale characterization of porous media is not feasible due to their complexity and multi-scale nature. A theory is derived to predict solute migration from a few salient medium and flow characteristics based on the abstraction of the porous medium as a network of conducts along which solute moves at variable travel times. This picture allows estimating residence times in porous media and assessing the migration and distribution of dissolved chemicals.

Phys. Rev. Lett. 126, 164501
Corresponding Authors: Marco Dentz

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