Impact of NAPL architecture on interphase mass transfer: A pore network study

Agaoglu, Berken; Scheytt, Traugott; Copty, Nadım K.

doi:10.1016/j.advwatres.2015.11.012

Cited by 19 publications

(20 citation statements)

References 48 publications

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“…The numerical dissolution modeling results match the experimental effluent concentration data extremely well (Aydin‐Sarikurt et al, ; Figure ). Additional validation of the formulation presented above has been presented by Agaoglu et al () for residual dissolution type experiments. We also generated the same results of (Agaoglu et al, ; section 2.3) using our code.…”

Section: Methodsologymentioning

confidence: 89%

“…We use this approach in our work. Dissolution rate coefficient of NAPL as an upscaled mass transfer coefficient is calculated based on the simulated NAPL concentration of pores in the pore network model (Agaoglu et al, ):

K_{f} = ((), \frac{\partial M}{\partial t}) ((), \frac{1}{A}) ((), \frac{1}{C_{s} - C})

where A is the overall interfacial area (interphase mass transfer area) in the pore network, that is, the summation of cross‐sectional areas of the throats, which connect NAPL‐filled pores with water‐filled pores. The concentration, C , is defined as the average resident concentration of NAPL in the aqueous phase over the entire pore network model.…”

Section: Methodsologymentioning

confidence: 99%

“…Pore‐scale studies provide insights into the impact of pore‐scale conditions—such as grain size, the pore‐scale distribution of the interfacial area, and fracture aperture distribution—on the interphase mass transfer (e.g., Agaoglu et al, ; Detwiler et al, ; Detwiler et al, ; Dillard & Blunt, ; Glass et al, ; Held & Celia, ; Jia et al, ; Keller & Sirivithiyapakorn, ; Sahloul et al, ). Mesoscale investigations of interphase mass transfer have been mostly based on laboratory experiments at centimeter length scale (e.g., Aydin‐Sarikurt et al, ; Bahar et al, ; Geller & Hunt, ; Tick & Rincon, ).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Pore‐Scale Heterogeneity on Macroscopic NAPL Dissolution Efficiency: A Two‐Scale Numerical Simulation Study

Aminnaji

Rabbani

Niasar

et al. 2019

Water Resources Research

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Interphase mass transfer or dissolution coefficient of nonaqueous phase liquids (NAPL) is an important parameter in predicting the transport of contaminant species in porous media. While the literature offers valuable insights into the dependence of this coefficient on different parameters at the continuum scale (e.g., contaminant saturation and Darcy velocity), effects of pore‐scale heterogeneity on macroscopic dissolution coefficient have received little attention. In this work a three‐dimensional pore‐scale model is developed to simulate interphase mass transfer over different synthetic pore network structures with various pore radii correlation lengths. The pore network modeling simulates dissolution of immobile NAPL into water (single phase) through diffusive throats for the water‐NAPL interface. The impacts of pore network spatially correlated heterogeneities, NAPL saturation/distribution, and aqueous phase velocity on NAPL mass transfer coefficient and water‐NAPL interfacial surface area are studied. These macroscopic properties are then employed in two‐dimensional continuum‐scale domains formed by concatenating 20 by 20 pore networks in x and y directions. The results highlight the impact of pore‐scale heterogeneity on the distribution of NAPL and subsequently on the dissolution rate (i.e., dissolution coefficient). An uncorrelated distribution of pore radii consistently leads to higher NAPL dissolution coefficient than spatially correlated heterogeneity. The results of continuum modeling show that NAPL dissolution rates are only different between domains formed by correlated and uncorrelated pore networks at very high flow rates and Darcy velocities. However, for typical values of Darcy velocity in groundwater systems, variation in mass transfer coefficient due to pore‐scale heterogeneity is minimal for efficient mass removal.

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Section: Methodsologymentioning

confidence: 89%

K_{f} = ((), \frac{\partial M}{\partial t}) ((), \frac{1}{A}) ((), \frac{1}{C_{s} - C})

Section: Methodsologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Pore‐Scale Heterogeneity on Macroscopic NAPL Dissolution Efficiency: A Two‐Scale Numerical Simulation Study

Aminnaji

Rabbani

Niasar

et al. 2019

Water Resources Research

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“…Particularly for supercritical CO 2 under larger buoyancy forces, the faster growth of perturbations existed over time, which can provoke a more complicated structure of fingers and also more CO 2 dissolution into brine [17]. In contrast, the CO 2 bubbles located parallel to the flow direction led to more bypass trapping and lower average effluent concentrations [26]. The CO 2 bubbles, which were bound by the bypass flow, generally had low connectivity to the surrounding brine, or were isolated in the large pores through the connected pore throats (shown in Figure 2 R4).…”

Section: Pore-scale Co 2 Dissolution and Flow Developmentmentioning

confidence: 99%

Characterizing the Dissolution Rate of CO2-Brine in Porous Media under Gaseous and Supercritical Conditions

Teng

et al. 2017

Applied Sciences

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Abstract:The CO 2 -brine dissolution homogenizes the distribution of residual CO 2 and reduces the leakage risk in the saline aquifer. As a key parameter to immobilize the free CO 2 , the dissolution rate of CO 2 -brine could be accelerated through mechanisms like diffusion and dispersion, which are affected by the subsurface condition, pore structure, and background hydrological flow. This study contributed the calculated dissolution rates of both gaseous and supercritical CO 2 during brine imbibition at a pore-scale. The flow development and distribution in porous media during dynamic dissolution were imaged in two-dimensional visualization using X-ray microtomography. The fingerings branching and expansion resulted in greater dissolution rates of supercritical CO 2 with high contact between phases, while the brine bypassed the clusters of gaseous CO 2 with a slower dissolution and longer duration due to the isolated bubbles. The dissolution rate of supercritical CO 2 was about two or three orders of magnitude greater than that of gaseous CO 2 , while the value distributions both spanned about four orders of magnitude. The dissolution rates of gaseous CO 2 increased with porosity, but the relationship was the opposite for supercritical CO 2 . CO 2 saturation and the Reynolds number were analyzed to characterize the different impacts on gaseous and supercritical CO 2 at different dissolution periods.

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“…Diffusion-type partial differential equations (PDEs) on connected graphs arise as relevant mathematical models for transport phenomena in environmental [1,2], biological [3], and material problems [4,5]. Here a connected graph is defined as an union of 0-D vertices that links 1-D intervals [6].…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of nonlinear and degenerate diffusion equations on connected graphs: application to moisture dynamics in non-woven fibrous strip networks

2016

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A numerical model of a nonlinear and degenerate diffusion equation on connected graphs, arising in a diversity of industrial applications, is presented. This paper shows that concurrently using a staggered finite volume spatial discretization with an analytical solution-based flux evaluation method and an operator-splitting technique computes stable and physicallyconsistent numerical solutions to the equation. A demonstrative application example of the numerical model to moisture dynamics in a hypothetical non-woven fibrous strip network under an evaporative environment is presented in order to show its versatility. Mathematical issues to be addressed in a future for better comprehending the model are finally discussed.

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Impact of NAPL architecture on interphase mass transfer: A pore network study

Cited by 19 publications

References 48 publications

Effects of Pore‐Scale Heterogeneity on Macroscopic NAPL Dissolution Efficiency: A Two‐Scale Numerical Simulation Study

Effects of Pore‐Scale Heterogeneity on Macroscopic NAPL Dissolution Efficiency: A Two‐Scale Numerical Simulation Study

Characterizing the Dissolution Rate of CO2-Brine in Porous Media under Gaseous and Supercritical Conditions

Numerical modelling of nonlinear and degenerate diffusion equations on connected graphs: application to moisture dynamics in non-woven fibrous strip networks

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