Solute transport in heterogeneous model porous media under different flow rates: Experimental and modelling study

Majdalani, Samer; Guinot, Vincent

doi:10.1016/j.jhydrol.2022.128790

Cited by 3 publications

(3 citation statements)

References 55 publications

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“…(Equation 3) as follows: In contrast to Fickian dispersion, which is characterized by a constant dispersion coefficient (Majdalani & Guinot, 2023;Neuman & Tartakovsky, 2009), super-dispersive behavior was observed here in the longitudinal direction. D L can be regarded as evolving as a power law with time D L (t) ∼ t α−1 (α ≈ 2), corresponding to similar observations in highly heterogeneous porous media (Boon et al, 2017;Cortis et al, 2004).…”

Section: Dispersionmentioning

confidence: 90%

“…The results indicate that dispersion can be enhanced to a more considerable degree in complex hydraulic conductivity fields, which leads to greater streamline compression and expansion due to the increase in heterogeneity of the velocity field. In heterogeneous porous media, anomalous and normal hydrodynamic dispersion is determined by the characteristic grain (pore) size (Puyguiraud et al., 2021; Sole‐Mari et al., 2022), grain orientation (Willingham et al., 2008), dimensionality (Le Borgne et al., 2010; Rolle et al., 2012), and Péclet number (De Dreuzy et al., 2012; Majdalani & Guinot, 2023; Puyguiraud et al., 2021; Sole‐Mari et al., 2022). The structural disorder of porous media enforces the overlap of lamellae (streamline or layer) within the dispersion area, resulting in the folding and coalescence of segregated solutes and enhancing mixing (Le Borgne et al., 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Dispersion is significantly affected by the convective flow field in porous media based on the spreading and deformation of solutes (or contaminants).The convection/advection flow rates under natural conditions vary widely. The linearity of the dispersion coefficient or mass transfer rate to flow rates in a single-phase flow has been studied extensively (Majdalani & Guinot, 2023;Maraqa, 2001). The results indicate that dispersion can be enhanced to a more considerable degree in complex hydraulic conductivity fields, which leads to greater streamline compression and expansion due to the increase in heterogeneity of the velocity field.…”

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confidence: 99%

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Impact of Oil Viscosity on Dispersion in the Aqueous Phase of an Immiscible Two‐Phase Flow in Porous Media: An X‐Ray Tomography Study

Li,

Nasir,

Wang

et al. 2023

Water Resources Research

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In this study, dispersion and mixing were studied in a steady two‐phase flow generated using a co‐injection method. The impact of oil viscosity was investigated over a large range of fluid viscosity ratios. The results indicate that highly heterogeneous flow fields are generated by a wide distribution of oil clusters with varied volumes. Variation in the velocity distribution enhanced the deformation and spreading of a tracer plume, resulting in large dispersion scales and accelerated spreading rates. The dispersion coefficients vary with time and exhibit a non‐Fickian dispersion during co‐injection. Consequently, anomalous mixing behaviors can be observed when the viscosity ratio exceeds 10. The mixing strength, characterized by the scalar dissipation rate, is first enhanced by distortion on the surface of the solute. Therefore, diffusion contributes to mixing, resulting in a faster decrease in the mixing strength in the late time regime. These results can be attributed to the fact that the non‐wetting fluid becomes disconnected, and the size of each cluster decreases as the oil viscosity increases. The formation of an oil film narrows pore spaces, and a lubrication effect of the oil film may contribute to the enhanced dispersion and mixing state, even with the low relative permeability of the wetting phase. This study provides insights into dispersion in partially saturated porous media with varied oil viscosities at both the macro and pore scales, which can further improve CO2 storage capacity and safety.This article is protected by copyright. All rights reserved.

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Section: Dispersionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Impact of Oil Viscosity on Dispersion in the Aqueous Phase of an Immiscible Two‐Phase Flow in Porous Media: An X‐Ray Tomography Study

Li,

Nasir,

Wang

et al. 2023

Water Resources Research

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Co-transport of ferrihydrite–organic matter colloids with Sb(v) in saturated porous media: implications for antimony mobility

Mao,

Wang,

et al. 2024

Environ. Sci.: Nano

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Irrigation Water Salinity Affects Solute Transport and Its Potential Factors Influencing Salt Distribution in Unsaturated Homogenous Red Soil

Zhang,

Yao,

Huang

et al. 2024

Agronomy

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As a promising alternative water source to alleviate irrigation water scarcity in red soil regions in southern China, low-quality water could enhance regional water resource utilization and promote sustainable agriculture. However, its soluble salt and ions could affect soil solute distribution and transport, potentially hindering crop growth. Undoubtedly, it is necessary to understand the mechanism of solute transport in red soil under low-quality water irrigation with different water salinity levels. Therefore, a one-dimensional vertical water infiltration experiment and a solute breakthrough experiment were conducted to evaluate the solute transport (soluble salt, Na+, and Cl−) in unsaturated and saturated homogenous red soil at different salinity levels [1 (S1), 2 (S2), 3 (S3), 5 (S5), and 10 (S10) g/L] when irrigated with simulated low-quality water using analytical-grade NaCl. Moreover, the potential factors affecting salt distribution in unsaturated red soil were determined. The findings indicate positive linear relationships between accumulations of three solutes and irrigation water salinity. Generally, the depth of maximum solute concentration increased with the increase in irrigation water salinity. Soluble salt, Na+, and Cl− exhibited early breakthrough and trailing in red soil, but higher irrigation water salinity could reduce PV and retardation. A mobile and immobile water model (MIM) showed that convection was dominant in solute transport in red soil under low-quality water irrigation. D decreased as a power function with increasing irrigation water salinity, while v and R decreased linearly. Furthermore, the red soil can adsorb Cl− resulting from its special charge characteristics under low-quality water irrigation, which may be the main source of salt adsorption. Additionally, v > soil pH > βsalt primarily influenced salt distribution in the 0–40 cm soil profile. This study can provide insights into solute transport in red soil under low-quality water irrigation, facilitating soil fertility and structure, as well as low-quality water irrigation strategy optimization.

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Solute transport in heterogeneous model porous media under different flow rates: Experimental and modelling study

Cited by 3 publications

References 55 publications

Impact of Oil Viscosity on Dispersion in the Aqueous Phase of an Immiscible Two‐Phase Flow in Porous Media: An X‐Ray Tomography Study

Impact of Oil Viscosity on Dispersion in the Aqueous Phase of an Immiscible Two‐Phase Flow in Porous Media: An X‐Ray Tomography Study

Co-transport of ferrihydrite–organic matter colloids with Sb(v) in saturated porous media: implications for antimony mobility

Irrigation Water Salinity Affects Solute Transport and Its Potential Factors Influencing Salt Distribution in Unsaturated Homogenous Red Soil

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