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Rock dissolution patterns and geochemical shutdown of CO₂–brine–carbonate reactions during convective mixing in porous media

Fu, X. and Cueto-Felgueroso, L. and Bolster, D. and Juanes, R. (2015) Rock dissolution patterns and geochemical shutdown of CO₂–brine–carbonate reactions during convective mixing in porous media. Journal of Fluid Mechanics, 764 . pp. 296-315. ISSN 0022-1120. https://resolver.caltech.edu/CaltechAUTHORS:20200902-153112676

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Abstract

Motivated by the process of CO₂ convective mixing in porous media, here we study the formation of rock-dissolution patterns that arise from geochemical reactions during Rayleigh–Bénard–Darcy convection. Under the assumption of instantaneous chemical equilibrium, we adopt a formulation of the local reaction rate as a function of scalar dissipation rate, a measure that depends solely on flow and transport, and chemical speciation, which is a measure that depends only on the equilibrium thermodynamics of the chemical system. We use high-resolution simulations to examine the interplay between the density-driven hydrodynamic instability and the rock dissolution reactions, and analyse the impact of geochemical reactions on the macroscopic mass exchange rate. We find that dissolution of carbonate rock initiates in regions of locally high mixing, but that the geochemical reaction shuts down significantly earlier than shutdown of convective mixing. This early shutdown feature reflects the important role that chemical speciation plays in this hydrodynamics–reaction coupled process. Finally, we extend our analysis to three dimensions and explore the morphology of dissolution patterns in three dimensions.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1017/jfm.2014.647DOIArticle
ORCID:
AuthorORCID
Fu, X.0000-0001-7120-704X
Additional Information:© 2015 Cambridge University Press. Received 6 April 2014; revised 31 October 2014; accepted 4 November 2014; first published online 5 January 2015. This work was funded by the US Department of Energy through a DOE CAREER Award (grant DE-SC0003907) and a DOE Mathematical Multifaceted Integrated Capability Center (grant DE-SC0009286). L.C.-F. gratefully acknowledges a ‘Ramón y Cajal’ Fellowship from the Spanish Ministry of Economy and Competitiveness (RyC-2012-11704). D.B. would like to acknowledge partial funding via NSF grant EAR-1351625.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0003907
Department of Energy (DOE)DE-SC0009286
Ministerio de Economía, Industria y Competitividad (MINECO)RYC-2012-11704
NSFEAR-1351625
Subject Keywords:buoyancy-driven instability, porous media, reacting flows
Record Number:CaltechAUTHORS:20200902-153112676
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200902-153112676
Official Citation:Fu, X., Cueto-Felgueroso, L., Bolster, D., & Juanes, R. (2015). Rock dissolution patterns and geochemical shutdown of CO₂–brine–carbonate reactions during convective mixing in porous media. Journal of Fluid Mechanics, 764, 296-315. doi:10.1017/jfm.2014.647
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105231
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Sep 2020 23:24
Last Modified:08 Sep 2020 23:24

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