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dc.contributor.authorKim, Daesang
dc.contributor.authorLindquist, W. Brent
dc.date.accessioned2015-05-03T14:24:48Z
dc.date.available2015-05-03T14:24:48Z
dc.date.issued2013-11-20
dc.identifier.citationEffects of network dissolution changes on pore-to-core upscaled reaction rates for kaolinite and anorthite reactions under acidic conditions 2013, 49 (11):7575 Water Resources Research
dc.identifier.issn00431397
dc.identifier.doi10.1002/2013WR013667
dc.identifier.urihttp://hdl.handle.net/10754/552135
dc.description.abstractWe have extended reactive flow simulation in pore-network models to include geometric changes in the medium from dissolution effects. These effects include changes in pore volume and reactive surface area, as well as topological changes that open new connections. The computed changes were based upon a mineral map from an X-ray computed tomography image of a sandstone core. We studied the effect of these changes on upscaled (pore-scale to core-scale) reaction rates and compared against the predictions of a continuum model. Specifically, we modeled anorthite and kaolinite reactions under acidic flow conditions during which the anorthite reactions remain far from equilibrium (dissolution only), while the kaolinite reactions can be near-equilibrium. Under dissolution changes, core-scale reaction rates continuously and nonlinearly evolved in time. At higher injection rates, agreement with predictions of the continuum model degraded significantly. For the far-from-equilibrium reaction, our results indicate that the ability to correctly capture the heterogeneity in dissolution changes in the reactive mineral surface area is critical to accurately predict upscaled reaction rates. For the near-equilibrium reaction, the ability to correctly capture the heterogeneity in the saturation state remains critical. Inclusion of a Nernst-Planck term to ensure neutral ionic currents under differential diffusion resulted in at most a 9% correction in upscaled rates.
dc.publisherAmerican Geophysical Union (AGU)
dc.relation.urlhttp://doi.wiley.com/10.1002/2013WR013667
dc.rightsArchived with thanks to Water Resources Research. © 2013. American Geophysical Union. All Rights Reserved.http://doi.wiley.com/10.1002/2013WR013667
dc.titleEffects of network dissolution changes on pore-to-core upscaled reaction rates for kaolinite and anorthite reactions under acidic conditions
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.identifier.journalWater Resources Research
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionDepartment of Applied Mathematics and Statistics; Stony Brook University; Stony Brook New York USA
kaust.personKim, Daesang
refterms.dateFOA2014-05-20T00:00:00Z
dc.date.published-online2013-11-20
dc.date.published-print2013-11


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