On the role of density-driven dissolution of CO2 in phreatic karst systems

Class, Holger; Bürkle, Pascal; Sauerborn, Tim; Trötschler, O.; Strauch, Bruce; Zimmer, Martin

doi:10.1002/essoar.10507661.1

Cited by 2 publications

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“…Recently, Class et al. (2021) also showed a similar behavior in a free‐flow (nonporous), solutal mixed convection problem. However, no mechanistic explanation for the emergence of this nonmonotonic behavior was suggested, and hydrodynamic dispersion was not considered in these papers.…”

Section: Resultsmentioning

confidence: 68%

The Role of Mixed Convection and Hydrodynamic Dispersion During CO₂ Dissolution in Saline Aquifers: A Numerical Study

Tsinober

Rosenzweig

Class

et al. 2022

Water Resources Research

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Dissolution trapping plays a significant role in CO2 geological storage. When CO2 dissolves in aquifer brines, the aqueous solution is heavier than the underlying resident brine. This results in convective instability in the form of CO2‐rich fingers, which accelerates dissolution. It was recently shown that background flow affects CO2 dissolution by suppressing the development of convective fingers. However, there was a discrepancy between computational results and measurements, with the computational results demonstrating a decrease in the dissolution rate and the laboratory measurements showing no significant effect. Here, we attempted to understand this difference by exploring the relations between the transport mechanisms that facilitate convective mixing. We investigated the role of background flow by using numerical simulations that were validated by laboratory measurements and analytical solutions. Simulations were generated for the same porous medium and fluid pair used in the experiments, keeping the Rayleigh number constant, while changing the background velocity and the Peclet number. Studying the flux components revealed three distinct regimes characterized by the Peclet to Rayleigh ratio Pe/Ra. When Pe/Ra < 0.77, natural convection dominated, and dissolution remained approximately constant. When the background flow was large (Pe/Ra > 2), dissolution was controlled by pure forced convection and increased with Pe/Ra. In the intermediate range (0.77 < Pe/Ra < 2), both natural convection and forced convection were important.

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Section: Resultsmentioning

confidence: 68%

The Role of Mixed Convection and Hydrodynamic Dispersion During CO₂ Dissolution in Saline Aquifers: A Numerical Study

Tsinober

Rosenzweig

Class

et al. 2022

Water Resources Research

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“…We calculated Δ ϱ by inserting the concentrations at the water table as the upper value, and for the lower value, we used the CO 2 concentration at 0.15 m from the bottom, corresponding to the position of the lower sensor. The calculations for the Sherwood number are also shown in the published data set related to this article (Class et al., 2021).…”

Section: Stagnant Water Column Exposed To Elevated Co2 Partial Pressuresmentioning

confidence: 90%

“…All implementations that were used for this study can be reproduced and found in a fixed version for download at https://git.iws.uni-stuttgart.de/dumux-pub/buerkle2021a. A tar‐ball of the software is also part of the datasets, which are published in the Data Repository of the University of Stuttgart (DaRUS) (Class et al., 2021).…”

Section: Data Availability Statementmentioning

confidence: 99%

On the Role of Density‐Driven Dissolution of CO₂ in Phreatic Karst Systems

Class

Bürkle

Sauerborn

et al. 2021

Water Resources Research

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Karst systems are found in many regions around the world. In the order of 10% of the continental surface is karst (Ford & Williams, 2007;Mangin, 1975). Karst is incredibly complex and manifold, and the processes that dominate karstification strongly depend on the hydrological and geomorphological properties of the karstic systems, which are subject to constant change while karstification is ongoing. Essentially, karstification happens in soluble rocks in contact with water, typically at the earth's surface or close to it. Karst research has evident relations to the disciplines and sub-disciplines of hydrology, geology, speleology, geomorphology, hydrogeology, etc. Karstic rocks are typically carbonate rocks made of Calcium and Magnesium minerals, where limestone (CaCO 3 ) and dolomite ( 𝐴𝐴 CaMg[CO3]2 ) are the most important subtypes. During karstification, these rocks are eroded mechanically, and, more importantly, corroded chemically. The corrosion of calcite and dolomite is driven by the availability of dissolved CO 2 in the water.

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On the role of density-driven dissolution of CO2 in phreatic karst systems

Cited by 2 publications

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The Role of Mixed Convection and Hydrodynamic Dispersion During CO₂ Dissolution in Saline Aquifers: A Numerical Study

The Role of Mixed Convection and Hydrodynamic Dispersion During CO₂ Dissolution in Saline Aquifers: A Numerical Study

On the Role of Density‐Driven Dissolution of CO₂ in Phreatic Karst Systems

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On the role of density-driven dissolution of CO2 in phreatic karst systems

Cited by 2 publications

References 0 publications

The Role of Mixed Convection and Hydrodynamic Dispersion During CO2 Dissolution in Saline Aquifers: A Numerical Study

The Role of Mixed Convection and Hydrodynamic Dispersion During CO2 Dissolution in Saline Aquifers: A Numerical Study