Abstract
Interfacial area is an important factor during two-phase flow in porous media because mass-transfer mechanisms take place at the interfaces of immiscible phases. The objective of this work is to quantify how grain-size distribution affects the temporal development of interfacial area during two-phase flow through porous media. A two-phase lattice Boltzmann model (color gradient method) was used to simulate drainage (displacement of a wetting fluid by a non-wetting fluid) and imbibition (displacement of the non-wetting fluid by the wetting fluid) in an ensemble of two-dimensional porous media samples. Five groups of porous media, each comprising 20 realizations, were characterized by their median grain size (d50) and coefficient of uniformity (Cu). For all 100 realizations, simulations of drainage and imbibition were conducted until steady-state saturation was achieved, and interfacial area was monitored throughout the simulations. During both drainage and imbibition, the interfacial area initially increases with time until reaching a peak area, then decreases, and then plateaus at a steady-state value. Interfacial area is higher during imbibition than during drainage. The temporal evolution of interfacial area, as quantified by peak area and time to reach peak area, was similar in the three groups characterized by small grain size (d50 ≈ 7.7 lattice units) and relatively uniform grain-size distribution (Cu ≈ 1.21, 1.49, 1.85), for both drainage and imbibition. This suggests that, for the fluid conditions considered here, nonuniformity of grain size is not important below a certain threshold value of Cu. However, two groups with larger grain size (d50 ≈ 8.9 lattice units) and relatively nonuniform grain-size distribution (Cu ≈ 1.85, 2.29) exhibited differences from each other, suggesting that nonuniformity of grain size affects interfacial area when Cu is above a certain value. Furthermore, median grain size was observed to have important effects on temporal evolution of interfacial area.
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Availability of Data and Material
Measured values of interfacial area and fluid saturations are available from the corresponding author upon request.
Code Availability
MATLAB codes for the lattice Boltzmann model (color gradient model) are available from the corresponding author upon request.
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Acknowledgements
This paper is based upon the funding and support of the Foreign Fulbright PhD Fellowship. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the Fulbright Association. The authors are grateful for the valuable help and comments received from Dr. Sebastian Leclaire and Dr. Yu Chen during two-phase model development and coding. The computations for the work were performed on the Research Computing Resources of the University of South Florida (USF). The authors thank Dr. Amy Stuart of USF for her assistance with deploying the codes on USF’s Research Computing Resources.
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This paper is based upon the funding and support of the Foreign Fulbright PhD Fellowship. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the Fulbright Association.
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Fizza Zahid had primary responsibility for generating the porous media realizations, wring the lattice Boltzmann codes, testing and validating the codes, running the drainage and imbibition simulations, collecting data, and analyzing data. Jeffrey Cunningham directed the project and supervised Fizza Zahid and was involved in all of the above-named steps. The two authors contributed equally to the writing of the manuscript.
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Zahid, F., Cunningham, J.A. Effect of Grain-Size Distribution on Temporal Evolution of Interfacial Area during Two-phase Flow in Porous Media. Transp Porous Med 144, 283–300 (2022). https://doi.org/10.1007/s11242-022-01767-7
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DOI: https://doi.org/10.1007/s11242-022-01767-7