Abstract
Pore-scale finite-volume continuum models of electrokinetic processes are used to predict the Debye lengths, velocity, and potential profiles for two-dimensional arrays of circles, ellipses and squares with different orientations. The pore-scale continuum model solves the coupled Navier–Stokes, Poisson, and Nernst–Planck equations to characterize the electro-osmotic pressure and streaming potentials developed on the application of an external voltage and pressure difference, respectively. This model is used to predict the macroscale permeabilities of geomaterials via the widely used Carmen–Kozeny equation and through the electrokinetic coupling coefficients. The permeability results for a two-dimensional X-ray tomography-derived sand microstructure are within the same order of magnitude as the experimentally calculated values. The effect of the particle aspect ratio and orientation on the electrokinetic coupling coefficients and subsequently the electrical and hydraulic tortuosity of the porous media has been determined. These calculations suggest a highly tortuous geomaterial can be efficient for applications like decontamination and desalination.
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Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525. This project is funded by the Sandia Laboratory-Directed Research and Development (LDRD) program, through the Earth Science Research Foundation and an Academic Alliance with University of Illinois. This paper describes objective technical results and analysis. Any subjective views or opinions that might be expressed in the paper do not necessarily represent the views of the U.S. Department of Energy or the United States Government.
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PP contributed to numerical model development, analysis of results and manuscript writing; KK and NA supervised the research project and edited the manuscript.
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Priya, P., Kuhlman, K.L. & Aluru, N.R. Pore-Scale Modeling of Electrokinetics in Geomaterials. Transp Porous Med 137, 651–666 (2021). https://doi.org/10.1007/s11242-021-01581-7
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DOI: https://doi.org/10.1007/s11242-021-01581-7