Anomalous transport of colloids in heterogeneous porous media: A multi-scale statistical theory

Fan, Dian; Chapman, Emma; Khan, Aisha Urooj; Iacoviello, Francesco; Mikutis, Gediminas; Pini, Ronny; Striolo, Alberto

doi:10.1016/j.jcis.2022.02.127

Cited by 16 publications

(9 citation statements)

References 62 publications

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“…A sphere is the most straightforward 3D representation of a single broken rock mass, and choosing a real geometry requires a higher computational cost. At larger scales, when considering the distribution of particles over a specific range, combinations of non-homogeneous geometries [44] or spheres [31] with fixed, regular [45], or random distribution in the model [29,30]. For computational efficiency, randomly distributed spheres are used in this paper to represent the broken rock mass, which is considered an isotropic porous medium, as shown in Figure 3.…”

Section: Model Simplificationmentioning

confidence: 99%

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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Section: Model Simplificationmentioning

confidence: 99%

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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“…Once quantified, these properties could be included in reservoir simulators to predict and derisk the future development of a petroleum reservoir. Some of the key physical phenomena that need to be quantified include, but are not limited to, the following: (1) As the brine composition changes upon dissolution of both CO Potential solution: To solve this multiscale problem, it will be necessary to quantify the effective particle−particle interactions as a function of system conditions, 78,79 the mechanical properties of the particles themselves, including elastic deformation, the effect of fluid flow, the transport of the particles through the matrix, 80 their agglomeration into aggregates, 81 their deposition, 82 and eventually the effect of particle agglomeration on the permeability of the host materials.…”

Section: ■ Some Research Opportunitiesmentioning

confidence: 99%

Upcoming Transformations in Integrated Energy/Chemicals Sectors: Some Challenges and Several Opportunities

Striolo

Huang

2022

J. Phys. Chem. C

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The sociopolitical events over the past few years led to transformative changes in both the energy and chemical sectors. One of the most evident consequences of these events is the significant focus on sustainability. In fact, rather than an engaging discussion within elite social circles, the search for sustainability is now one of the hard requirements investors impose on companies. The concept of sustainability itself has developed since its inception, and now it encompasses environmental as well as socioeconomic aspects. The major players in the energy and chemical sectors seem to embrace these changes and the related challenges; in most cases, tangible ambitious goals have been proposed. For example, bp aims "to become a net zero company by 2050 or sooner, and to help the world get to net zero". Although tragic events such as the war in Ukraine directly affect global supply chains, leading to some reconsiderations in medium-term industrial and political strategies, trends and public demands seem determined to pursue ambitious sustainable goals, as tangible as the European Union's "Fit for 55" climate package, approved on May 12, 2022, which effectively bans internal combustion engines for new passenger cars and light commercial vehicles from 2035. These trends will likely lead to profound changes in both the chemical and energy sectors. While some predictions may miss the target, speculating about upcoming challenges and opportunities could help us prepare for the future. This is the purpose of this brief Perspective.

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“…In EL models, the base fluid is described by the Eulerian approach and NPs are simulated by a Lagrangian approach that can be used for tracking the trajectory of particles. The Euler–Lagrange model was developed for simulating fine particle suspension in liquids: sedimentation, particle-induced stratification, and particle-laden turbulence. − Additionally, the Euler–Lagrange model was used to investigate the influence of Brownian and gravitational forces on the velocity and transport of induced CuO NPs in oil phase . However, with the increase of injecting particle number, tracking the trajectory of every particle becomes intractable …”

Section: Introductionmentioning

confidence: 99%

New Hybrid Pore-Scale Simulation Method to Characterize Nanoparticle Transport, Aggregation, and Attachment Behaviors

Yuan

et al. 2023

Ind. Eng. Chem. Res.

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To facilitate the applications of nanoparticles (NPs) for enhancing hydrocarbon production, it is important to understand the transport and attachment behaviors of NPs on a microscopic scale. A novel, hybrid pore-scale simulation method using lattice-Boltzmann (LB) coupled with Langevin-dynamics (LD) is proposed to investigate the transport mechanism of nanoparticles in a microchannel. The LD method is developed to characterize the physics of Brownian motion, thermal fluctuation− dissipation, multi-body hydrodynamics, and particle−particle interactions. A discrete LB forcing source distribution is employed to couple with LD. The random force of NPs, friction force of NPs, van der Waals force, as well as the electrostatic force between NPs and the microchannel are quantified in this Euler−Lagrange method to more accurately simulate the transport and attachment of NPs. Various examples (i.e., single particle relaxation in viscous flow, Brownian motion in the dilute colloid system, and the attachment efficiency of NPs onto channel surface) are implemented to verify the LB−LD method. The controlling factors (i.e., ionic strength, particle diameter, and Reynolds number) are investigated in the attachment process of NPs. The NP with intense Brownian diffusion and weak hydrodynamic effect is prone to have better attachment efficiency. It is observed that a maximum value of attachment efficiency exists as the ionic strength increases to about 0.01 M. Moreover, the ionic strength of the aqueous phase exerts significant impact on the transport behavior of NPs: when the ionic strength is less than 0.005 M, an ordered structure of NP suspensions is formed due to the dominance of electrostatic repulsion force; varying structures of NP suspension are observed with the increase of ionic strength, and when the ionic strength is more than 0.01 M, a clustered structure of NP suspensions is formed by the dominance of van der Waals force. To quantitatively characterize the structure of NP suspensions under varying conditions, a general phase diagram including three flow patterns (isolated, transitional, and clustered regime) is first proposed for NP suspension with specified ionic strength and Reynolds number. The outcomes of this work provide valuable insights into the critical importance of particle size, ionic strength, and hydrodynamic effects on the attachment and transport of NPs in porous media.

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Anomalous transport of colloids in heterogeneous porous media: A multi-scale statistical theory

Cited by 16 publications

References 62 publications

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

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

Upcoming Transformations in Integrated Energy/Chemicals Sectors: Some Challenges and Several Opportunities

New Hybrid Pore-Scale Simulation Method to Characterize Nanoparticle Transport, Aggregation, and Attachment Behaviors

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