Methods for Laser-Induced Fluorescence Imaging of Solute Plumes at the Darcy Scale in Quasi-Two-Dimensional, Refractive Index-Matched Porous Media

Roth, E. J.; Mays, D. C.; Neupauer, R. M.; Sather, Lauren J.; Crimaldi, John P.

doi:10.1007/s11242-021-01545-x

Cited by 5 publications

(24 citation statements)

References 26 publications

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“…Well W5 is located in center of the apparatus, and the remaining four wells (W1-W4) are equally spaced on a circle of radius L = 11.6 cm centered at well W5 (Fig. 1) (Roth et al 2021).…”

Section: Methodsmentioning

confidence: 99%

“…The RIM pair used in the experiment was borosilicate glass beads (porous medium) and glycerin (pore fluid), both of which have a refractive index of 1.447. The apparatus was filled with 16 layers of 3-mm-diameter beads (Pyrex, part# 7268-3), with hexagonal close packing (HCP) arrangement (Roth et al 2021). Along the bottom face, 1-mm-diameter beads (Chemglass, part# CG-1101-06) were placed in the pore space between the 3-mm-diameter beads to maintain relatively uniform porosity in the vertical column, that would otherwise be nonuniform due to the placement of spherical beads against a planar surface (Roth et al 2020).…”

Section: Methodsmentioning

confidence: 99%

“…Along the bottom face, 1-mm-diameter beads (Chemglass, part# CG-1101-06) were placed in the pore space between the 3-mm-diameter beads to maintain relatively uniform porosity in the vertical column, that would otherwise be nonuniform due to the placement of spherical beads against a planar surface (Roth et al 2020). Along the upper face of the apparatus, the top three layers of beads were opaque (Roth et al 2021).…”

Section: Methodsmentioning

confidence: 99%

“…In this experiment, laser-induced fluorescence is used to track the movement of a plume of fluorescent solute through refractive-index-matched (RIM) porous media and pore fluid. For a complete description of the experimental setup and procedure, the reader is directed to Roth et al (2021). This section presents the key points from Roth et al (2021) that are important for the present study.…”

Section: Experimental Investigationmentioning

confidence: 99%

“…For a complete description of the experimental setup and procedure, the reader is directed to Roth et al (2021). This section presents the key points from Roth et al (2021) that are important for the present study.…”

Section: Experimental Investigationmentioning

confidence: 99%

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Demonstration of Reversible Dispersion in a Darcy-Scale Push-Pull Laboratory Experiment

et al. 2021

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A solute transport experiment was conducted in a 50 cm × 50 cm × 4.4 cm apparatus filled with monodisperse glass beads and glycerin, using Rhodamine 6G dye as the solute. The dye movement was tracked through two cycles of a push-pull flow pattern, alternating between approximately radial outward flow and approximately radial inward flow. Depthaveraged concentration was measured during the experiment and integrated over the angular direction during post-processing to obtain a radial distribution of concentration. The experimental results were replicated using particle tracking, simulating advection and dispersion in the radial direction, including reversible dispersion during extraction. Results show that spreading of the measured concentrations follow a Fickian dispersion model during steps with radial outward flow. During steps with radial inward flow, spreading is reversed and can be modeled as reversible dispersion. The observed reversal in spreading is an indication of incomplete mixing within the pore space.

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“…Well W5 is located in center of the apparatus, and the remaining four wells (W1-W4) are equally spaced on a circle of radius L = 11.6 cm centered at well W5 (Fig. 1) (Roth et al 2021).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Experimental Investigationmentioning

confidence: 99%

Section: Experimental Investigationmentioning

confidence: 99%

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Demonstration of Reversible Dispersion in a Darcy-Scale Push-Pull Laboratory Experiment

et al. 2021

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The Role of High-Permeability Inclusion on Solute Transport in a 3D-Printed Fractured Porous Medium: An LIF–PIV Integrated Study

Kong¹,

Ahkami²,

Naets³

et al. 2022

Transp Porous Med

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It is well-known that the presence of geometry heterogeneity in porous media enhances solute mass mixing due to fluid velocity heterogeneity. However, laboratory measurements are still sparse on characterization of the role of high-permeability inclusions on solute transport, in particularly concerning fractured porous media. In this study, the transport of solutes is quantified after a pulse-like injection of soluble fluorescent dye into a 3D-printed fractured porous medium with distinct high-permeability (H-k) inclusions. The solute concentration and the pore-scale fluid velocity are determined using laser-induced fluorescence and particle image velocimetry techniques. The migration of solute is delineated with its breakthrough curve (BC), temporal and spatial moments, and mixing metrics (including the scalar dissipation rate, the volumetric dilution index, and the flux-related dilution index) in different regions of the medium. With the same H-k inclusions, compared to a H-k matrix, the low-permeability (L-k) matrix displays a higher peak in its BC, less solute mass retention, a higher peak solute velocity, a smaller peak dispersion coefficient, a lower mixing rate, and a smaller pore volume being occupied by the solute. The flux-related dilution index clearly captures the striated solute plume tails following the streamlines along dead-end fractures and along the interface between the H-k and L-k matrices. We propose a normalization of the scalar dissipation rate and the volumetric dilution index with respect to the maximum regional total solute mass, which offers a generalized examination of solute mixing for an open region with a varying total solute mass. Our study presents insights into the interplay between the geometric features of the fractured porous medium and the solute transport behaviors at the pore scale.

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Two-Dimensional Modeling of Nano Zero-Valent Iron Transport and Retention before and after Phosphate Adsorption

Lin

2022

Environ. Sci. Technol.

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The mobility of nano zero-valent iron (nZVI) will greatly affect its practical application as a remediation material for contaminated groundwater. One-dimensional (1D) column tests are commonly used in previous work to study its migration behavior, but the two-dimensional (2D) test is still very limited. This study reports a novel research system to study the 2D transport and retention behavior of colloids and solutes, which includes a 2D model test setup and the corresponding image analysis method. The transport behaviors of methyl orange (MO), nZVI, and phosphate-loaded nZVI (PnZVI) are studied using this system. The results show that the research system can reasonably describe the tempospatial concentration distribution of colloids and solutes. After phosphate adsorption, the mobility of nZVI is enhanced due to the increase in negative surface charge, which implies a potential environmental risk of nZVI to facilitate contaminant transport. The migration of PnZVI is not significantly influenced by its density, which is faster than MO in the longitudinal direction. The range of the plume of PnZVI in the longitudinal direction is larger than that of MO, which implies that PnZVI has a stronger longitudinal dispersion than MO.

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Methods for Laser-Induced Fluorescence Imaging of Solute Plumes at the Darcy Scale in Quasi-Two-Dimensional, Refractive Index-Matched Porous Media

Cited by 5 publications

References 26 publications

Demonstration of Reversible Dispersion in a Darcy-Scale Push-Pull Laboratory Experiment

Demonstration of Reversible Dispersion in a Darcy-Scale Push-Pull Laboratory Experiment

The Role of High-Permeability Inclusion on Solute Transport in a 3D-Printed Fractured Porous Medium: An LIF–PIV Integrated Study

Two-Dimensional Modeling of Nano Zero-Valent Iron Transport and Retention before and after Phosphate Adsorption

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