Browsing by Subject "Reactive Transport"

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    Data Repository for Effects of Fluid Flow and Fracture Aperture on Solute Exchange in Triple Porosity Carbonates: Etched Rock Core Experiments and Numerical Modeling
    (2025-01-30) Soucey, Charles E; Sutton, Collin R; Zahasky, Christopher; Yang, Weipeng; Kang, Peter K; pkkang@umn.edu; Kang, Peter K; Kang Research Lab
    The data contained in this repository is related to the results and figures shown in the manuscript "Effects of Fluid Flow and Fracture Aperture on Solute Exchange in Triple Porosity Carbonates: Etched Rock Core Experiments and Numerical Modeling." The data encompasses multiple different data types and covers all of the major experiments used in the manuscript, including PET scan data extracted from core flooding experiments in our etched rock cores, COMSOL numerical model files, image data from digital photographs and HSV thresholding of cores, and breakthrough curve data with model files for MFIT curve fitting. The files included here are the necessary files for replicating the primary results outlined in the paper. This data is now released for the purpose of allowing open access to data and information for the purpose of replicating our results in future studies.
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    Microfluidic Experiments and Numerical Simulations of Inertia-induced Mixing and Reaction Maximization in Laminar Porous Media Flows
    (2024-10-10) Chen, Michael; Lee, Sanghyun; Kang, Peter; pkkang@umn.edu; Kang, Peter; Kang Research Group
    Solute transport and biogeochemical reactions in porous and fractured media flows are controlled by mixing, as are subsurface engineering operations such as contaminant remediation, geothermal energy production, and carbon sequestration. A porous media flow is generally regarded as slow, so the effects of fluid inertia on mixing and reaction are typically ignored. Here, we demonstrate through microfluidic experiments and numerical simulations of mixing-induced reaction, that inertial recirculating flows readily emerge in laminar porous media flows and dramatically alter mixing and reaction dynamics. An optimal Reynolds number that maximizes the reaction rate is observed for individual pore throats of different sizes. This reaction maximization is attributed to the effects of recirculation flows on reactant availability, mixing, and reaction completion, which depend on the topology of recirculation relative to the boundary of the reactants or mixing interface. Recirculation enhances mixing and reactant availability, but a further increase in flow velocity reduces the residence time in recirculation, leading to a decrease in reaction rate. The reaction maximization is also confirmed in a flow channel with grain inclusions and a randomized porous media. Interestingly, the domain-wide reaction rate shows a dramatic increase with increasing Re in the randomized porous media case. This is because fluid inertia induces complex three-dimensional flows in a randomized porous media, which significantly increases transverse spreading and mixing. This study shows how inertial flows control reaction dynamics at the pore scale and beyond, thus having major implications for a wide range of environmental systems.