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Prediction of the low-velocity distribution from the pore structure in simple porous media

Author(s)
de Anna, Pietro; Quaife, Bryan; Biros, George; Juanes, Ruben
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Abstract
The macroscopic properties of fluid flow and transport through porous media are a direct consequence of the underlying pore structure. However, precise relations that characterize flow and transport from the statistics of pore-scale disorder have remained elusive. Here we investigate the relationship between pore structure and the resulting fluid flow and asymptotic transport behavior in two-dimensional geometries of nonoverlapping circular posts. We derive an analytical relationship between the pore throat size distribution f_{λ}∼λ^{−β} and the distribution of the low fluid velocities f_{u}∼u^{−β/2}, based on a conceptual model of porelets (the flow established within each pore throat, here a Hagen-Poiseuille flow). Our model allows us to make predictions, within a continuous-time random-walk framework, for the asymptotic statistics of the spreading of fluid particles along their own trajectories. These predictions are confirmed by high-fidelity simulations of Stokes flow and advective transport. The proposed framework can be extended to other configurations which can be represented as a collection of known flow distributions.
Date issued
2017-12
URI
http://hdl.handle.net/1721.1/114420
Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Journal
Physical Review Fluids
Publisher
American Physical Society
Citation
de Anna, Pietro et al. "Prediction of the low-velocity distribution from the pore structure in simple porous media." Physical Review Fluids 2, 12 (December 2017): 124103 © 2017 American Physical Society
Version: Final published version
ISSN
2469-990X
2469-9918

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