Observations of 3-D transverse dispersion and dilution in natural consolidated rock by X-ray tomography

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Title: Observations of 3-D transverse dispersion and dilution in natural consolidated rock by X-ray tomography
Authors: Boon, M
Bijeljic, B
Niu, B
Krevor, S
Item Type: Journal Article
Abstract: Recent studies have demonstrated the importance of transverse dispersion for dilution and mixing of solutes but most observations have remained limited to two-dimensional sand-box models. We present a new core-flood test to characterize solute transport in 3-D natural-rock media. A device consisting of three annular regions was used for fluid injection into a cylindrical rock core. Pure water was injected into the center and outer region and a NaI solution into the middle region. Steady state transverse dispersion of NaI was visualized with an X-ray medical CT-scanner for a range of Peclét numbers. Three methods were used to calculate Dt: (1) fitting an analytical solution, (2) analyzing the second-central moment, and (3) analyzing the dilution index and reactor ratio. Transverse dispersion decreased with distance due to flow focusing. Furthermore, Dt in the power-law regime showed sub-linear behavior. Overall, the reactor ratios were high confirming the homogeneity of Berea sandstone.
Issue Date: 1-Aug-2016
Date of Acceptance: 30-Jul-2016
ISSN: 0309-1708
Publisher: Elsevier
Start Page: 266
End Page: 281
Journal / Book Title: Advances in Water Resources
Volume: 96
Copyright Statement: © 2016 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Sponsor/Funder: Qatar Shell Research and Technology Center QSTP LLC
Funder's Grant Number: 490000724
Keywords: Environmental Engineering
0905 Civil Engineering
0907 Environmental Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Earth Science and Engineering

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