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Article

Influence of Pore Size Distribution on the Electrokinetic Coupling Coefficient in Two-Phase Flow Conditions

1
School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK
2
Now at TechnipFMC, Newcastle Upon Tyne NE6 3PL, UK
3
Sorbonne Université, CNRS, EPHE, UMR 7619 METIS, F-75005 Paris, France
*
Author to whom correspondence should be addressed.
Academic Editor: Kristine Walraevens
Water 2021, 13(17), 2316; https://doi.org/10.3390/w13172316
Received: 11 June 2021 / Revised: 16 July 2021 / Accepted: 19 August 2021 / Published: 24 August 2021
Streaming potential is a promising method for a variety of hydrogeophysical applications, including the characterisation of the critical zone, contaminant transport or saline intrusion. A simple bundle of capillary tubes model that accounts for realistic pore and pore throat size distribution of porous rocks is presented in this paper to simulate the electrokinetic coupling coefficient and compared with previously published models. In contrast to previous studies, the non-monotonic pore size distribution function used in our model relies on experimental data for Berea sandstone samples. In our approach, we combined this explicit capillary size distribution with the alternating radius of each capillary tube to mimic pores and pore throats of real rocks. The simulation results obtained with our model predicts water saturation dependence of the relative electrokinetic coupling coefficient more accurately compared with previous studies. Compared with previous studies, our simulation results demonstrate that the relative coupling coefficient remains stable at higher water saturations but vanishes to zero more rapidly as water saturation approaches the irreducible value. This prediction is consistent with the published experimental data. Moreover, our model was more accurate compared with previously published studies in computing the true irreducible water saturation relative to the value reported in an experimental study on a Berea sandstone sample saturated with tap water and liquid CO2. Further modifications, including explicit modelling of the capillary trapping of the non-wetting phase, are required to improve the accuracy of the model. View Full-Text
Keywords: electrokinetic coupling coefficient; zeta potential; sandstones; partial water saturation; CO2 geo-sequestration; bundle of capillary tubes model; realistic capillary size distribution electrokinetic coupling coefficient; zeta potential; sandstones; partial water saturation; CO2 geo-sequestration; bundle of capillary tubes model; realistic capillary size distribution
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MDPI and ACS Style

Vinogradov, J.; Hill, R.; Jougnot, D. Influence of Pore Size Distribution on the Electrokinetic Coupling Coefficient in Two-Phase Flow Conditions. Water 2021, 13, 2316. https://doi.org/10.3390/w13172316

AMA Style

Vinogradov J, Hill R, Jougnot D. Influence of Pore Size Distribution on the Electrokinetic Coupling Coefficient in Two-Phase Flow Conditions. Water. 2021; 13(17):2316. https://doi.org/10.3390/w13172316

Chicago/Turabian Style

Vinogradov, Jan, Rhiannon Hill, and Damien Jougnot. 2021. "Influence of Pore Size Distribution on the Electrokinetic Coupling Coefficient in Two-Phase Flow Conditions" Water 13, no. 17: 2316. https://doi.org/10.3390/w13172316

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