Crossover from viscous fingering to fracturing in cohesive wet granular media: a photoporomechanics study
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D3SM00897E.pdf
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3.23 MB
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Author(s)
Meng, Yue
Li, Wei
Juanes, Ruben
Date Issued
2023
Journal
Soft Matter
Publisher
Royal Society of Chemistry
Citation
Meng, Yue, Li, Wei and Juanes, Ruben. 2023. "Crossover from viscous fingering to fracturing in cohesive wet granular media: a photoporomechanics study." Soft Matter, 19 (37).
Version
Final published version
Abstract
We study fluid-induced deformation and fracture of cohesive granular media, and apply photoporomechanics to uncover the underpinning grain-scale mechanics. We fabricate photoelastic spherical particles of diameter d = 2 mm, and make a monolayer granular pack with tunable intergranular cohesion in a circular Hele–Shaw cell that is initially filled with viscous silicone oil. We inject water into the oil-filled photoelastic granular pack, varying the injection flow rate, defending-fluid viscosity, and intergranular cohesion. We find two different modes of fluid invasion: viscous fingering, and fracturing with leak-off of the injection fluid. We directly visualize the evolving effective stress field through the particles' photoelastic response, and discover a hoop effective stress region behind the water invasion front, where we observe tensile force chains in the circumferential direction. Outside the invasion front, we observe compressive force chains aligning in the radial direction. We conceptualize the system's behavior by means of a two-phase poroelastic continuum model. The model captures granular pack dilation and compaction with the boundary delineated by the invasion front, which explains the observed distinct alignments of the force chains. Finally, we rationalize the crossover from viscous fingering to fracturing by comparing the competing forces behind the process: viscous force from fluid injection that drives fractures, and intergranular cohesion and friction that resist fractures.
Subjects
Condensed Matter Physics
General Chemistry
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Terms of Use
Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1039/d3sm00897e
