Influence of Particles Sizes and Flow Velocity on the Transport of Polydisperse Fine Particles in Saturated Porous Media: Laboratory Experiments

Bennacer, Lyacine; Ahfir, Nasre-Dine; Alem, Abdellah; Wang, Huaqing

doi:10.1007/s11270-022-05732-4

Cited by 8 publications

(7 citation statements)

References 35 publications

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“…This may be done by defining a kinetic attachment coefficient, which is a function of the collection efficiency (Lin et al., 2022). Since the collection efficiency depends significantly on the fluid velocity, the kinetic attachment coefficients will vary nonlinearly with fluid velocity, in agreement with experimental findings (Bennacer et al., 2022; Zheng et al., 2014). The effects of deposition‐unfavorable conditions, such as energy barriers, may be accounted for by multiplying the attachment coefficient with a sticking efficiency parameter.…”

Section: Implications For Continuum‐scale Colloid Transport Modelingsupporting

confidence: 88%

Colloid Transport and Retention in Constricted Tube Pore Spaces With Diverse Geometries and Orientations

Tang,

Raoof

2024

Water Resources Research

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Colloidal contaminants infiltrate and can be attached onto grain surfaces of soils and aquifers, where they may persist. In this study, Lagrangian particle tracking is used to investigate particle trajectories and attachment in pore and fracture spaces modeled as three‐dimensional constricted tubes with diverse geometries and orientations relative to gravity. A comprehensive force balance arising from hydrodynamic drag and lift, gravitational settling, Brownian motion, and attractive DLVO interactions is simulated. Results show that the collection efficiency η is primarily governed by the dimensionless settling number 𝑆, representing the relative dominance of gravitational over hydrodynamic forces experienced by the particles. High‐𝑆 scenarios have larger η and are more sensitive to pore orientation, while low‐𝑆 scenarios are more sensitive to pore geometry. For all scenarios but especially low‐S scenarios, the majority of colloid attachment occurs near pore extremities, where fluid velocities are low, such that mechanical remobilization of particles attached is improbable. In low‐𝑆 scenarios, particles may spread and become immobilized at greater distances from the contamination source owing to lower η, are harder to mechanically remobilize as they attach more disproportionately at pore extremities, and have trajectories more sensitive to minor forces, rendering their environmental fates complex. Characterizing the collection efficiency and deposition morphology for various pore space geometries and orientations is crucial in understanding particle fate and developing continuum‐scale models of colloid transport in real soils, where pore spaces are heterogeneous and advection paths are tortuous.

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Section: Implications For Continuum‐scale Colloid Transport Modelingsupporting

confidence: 88%

Colloid Transport and Retention in Constricted Tube Pore Spaces With Diverse Geometries and Orientations

Tang,

Raoof

2024

Water Resources Research

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“…Visualizing the suspended solids' microscopic movement process helps to analyze the deposition pattern of the suspended solids within the broken rock mass. Numerical results show that the simulation results of the deposition pattern of suspended solids match the experimental results [65], and the deposition of suspended solids within the broken rock under different pore size conditions varies greatly. From the microscopic point of view, the pore channels of coal rocks with small pore sizes are narrow, and their complexity is greater than that of coal rocks with large pore sizes.…”

Section: Deposition Of Suspended Solids Under Different Pore Size Con...mentioning

confidence: 53%

Numerical Study on Deposition Behavior of Micron-Sized Suspended Solids in Broken Rock Mass within a Goaf Based on Coupled CFD-DEM Method

Wang

Gao

et al. 2023

Water

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After coal mine wastewater is artificially injected into a groundwater reservoir transformed from a goaf, micron-sized suspended matter in the wastewater is purified by the broken rock mass in the goaf. Existing studies can only analyze the macroscopic changes in the content of suspended solids during the purification process, and it is difficult to explain the microscopic deposition mechanism of the suspended solids in broken rock. This paper studied the microscopic deposition behavior of micron-sized suspended solids inside the broken rock mass via numerical simulation using a coupled CFD-DEM method. In addition, indoor model tests were carried out to verify the accuracy and reliability of the model in comparison. The study results show that suspended solids’ deposition behavior varies significantly under broken rock masses’ different pore sizes (0.47 mm, 1.14 mm, 3.00 mm, and 5.33 mm). Within the goaf, the adsorption of suspended solids by the broken rock mass plays a dominant role. At the same time, suspended particles are mostly collected in the inlet area, and the difference in the number of deposited particles can reach 74% when comparing the first 50 mm range as well as the 50–100 mm range. The number of deposited particles at a flow rate of 0.02 m/s is 14% more than that at a flow rate of 0.06 m/s. This work offers new ideas for studying the purification mechanism of coal mine wastewater within a goaf.

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“…[6][7][8] Bennacer et al pointed out that FPs in porous media act as transport media to promote the transport of pollutants in groundwater, while the hydrodynamic dispersion coefficient and deposition kinetic coefficient increase with the increase in flow rate. 9 Hammadi et al studied the influence of the inhomogeneity of FPs size on the seepage process. 10 The results showed that the inhomogeneity of FPs makes smaller FPs more likely to deposit after the deposition of larger FPs.…”

Section: Introductionmentioning

confidence: 99%

Migration trajectories and blocking effect of the fine particles in porous media based on particle flow simulation

Bai,

Chen,

Zhang

et al. 2024

AIP Advances

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The particle flow code method based on the discrete element method was used to establish the seepage migration model of fine particles [fine particles (FPs), i.e., suspended particles] in a porous medium. A series of numerical simulations were carried out by changing the particle size, seepage velocity, particle injection number, and wide particle size gradation. The research showed that large FPs play a major role in blocking porous medium channels when the injected FPs have a wide size gradation. Due to the blocking effect, small FPs that would not otherwise have deposited also deposit. Moreover, by increasing the number of large FPs in the mixed particles, the total number of particles deposited and the number of smaller FPs deposited will also increase. The distribution of FPs in porous mediums can be divided into three types: surface deposition, internal deposition, and non-deposition. When the seepage velocity increases and reaches a seepage threshold, which is the critical seepage velocity, the deposited FPs will once again be in a suspended state and undergo migration. On the contrary, the FPs will continue to maintain their sedimentary state, and the critical seepage velocity will also increase correspondingly with increasing particle size.

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Influence of Particles Sizes and Flow Velocity on the Transport of Polydisperse Fine Particles in Saturated Porous Media: Laboratory Experiments

Cited by 8 publications

References 35 publications

Colloid Transport and Retention in Constricted Tube Pore Spaces With Diverse Geometries and Orientations

Colloid Transport and Retention in Constricted Tube Pore Spaces With Diverse Geometries and Orientations

Numerical Study on Deposition Behavior of Micron-Sized Suspended Solids in Broken Rock Mass within a Goaf Based on Coupled CFD-DEM Method

Migration trajectories and blocking effect of the fine particles in porous media based on particle flow simulation

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