Pore-scale intermittent velocity structure underpinning anomalous transport through 3-D porous media
Name
Juanes_Pore-Scale Intermittent.pdf
Size
2.29 MB
Format
Adobe PDF
Checksum (MD5)
231000390c6f7387a9faf7a609fba31b
Author(s)
Kang, Peter K.
de Anna, Pietro
Nunes, Joao P.
Bijeljic, Branko
Blunt, Martin J.
Juanes, Ruben
Date Issued
September 2014
Journal
Geophysical Research Letters
Publisher
American Geophysical Union (AGU)
Citation
Kang, Peter K., Pietro de Anna, Joao P. Nunes, Branko Bijeljic, Martin J. Blunt, and Ruben Juanes. “Pore-Scale Intermittent Velocity Structure Underpinning Anomalous Transport through 3-D Porous Media.” Geophysical Research Letters 41, no. 17 (September 15, 2014): 6184–6190.
Version
Final published version
Abstract
We study the nature of non-Fickian particle transport in 3-D porous media by simulating fluid flow in the intricate pore space of real rock. We solve the full Navier-Stokes equations at the same resolution as the 3-D micro-CT (computed tomography) image of the rock sample and simulate particle transport along the streamlines of the velocity field. We find that transport at the pore scale is markedly anomalous: longitudinal spreading is superdiffusive, while transverse spreading is subdiffusive. We demonstrate that this anomalous behavior originates from the intermittent structure of the velocity field at the pore scale, which in turn emanates from the interplay between velocity heterogeneity and velocity correlation. Finally, we propose a continuous time random walk model that honors this intermittent structure at the pore scale and captures the anomalous 3-D transport behavior at the macroscale.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1002/2014gl061475
