A review of transport of nanoparticles in porous media

Evaluating Single‐Collector Efficiencies of Colloid Deposition From Lagrangian Simulations: Geometric Models and Particle Release Scenarios

“…In Scenario I, particles are assumed to be released from the upper half of the fluid envelope boundary with the start location ( r = b , θ ) for all θ in the interval [0, π/2]. The analytical velocity perpendicular to the fluid envelope boundary is U r = b = U ∞ cos θ (Boccardo et al., 2020; Masliyah & Bhattacharjee, 2006). Within an increment angle Δ θ , the number of particles entering into the fluid envelope boundary per unit time can be expressed as ( U ∞ cos θ ) C 0,2D ( b Δ θ ).…”

“…The analytical velocity (see Text S4 in Supporting Information S1) of the Happel sphere-in-cell model along the fluid envelope boundary as shown in Figure 2c (purple line) is symmetric with respect to L shell and is much higher than the numerical solution. The discrepancy mainly results from the assumptions of the sphere-in-cell model, which treat the fluid as undisturbed by the collector out of the cell and apply the following boundary conditions (Boccardo et al, 2020):…”

Time resolved pore scale monitoring of nanoparticle transport in porous media using synchrotron X-ray μ-CT

“…Accurate prediction of nanoparticle (NP) mobility and fate in porous matrices is of high importance for many disciplines, e.g. , NP environmental risk assessment, 1,2 remediation applications, 3–5 natural NP in biogeochemical cycles, 6 NP as vectors for micropollutants 7 and microbial antibiotic resistance genes. 8 This is demonstrated by the plethora of macroscale column and modelling studies performed to date in order to understand and define the critical parameters that control NP transport and retention in porous media (PM).…”

Retention of sulfidated nZVI (S-nZVI) in porous media visualized by X-ray μ-CT – the relevance of pore space geometry

“…This is partly because several retention mechanisms occur simultaneously. Furthermore, the heterogeneous pore geometry of the porous medium, which is a key NP transport parameter, cannot be easily included in these models, 19 to a large extent because we generally lack detailed information of the pore geometry ( i.e. size distribution, shape and connectivity of pores and throats) and how it affects NP retention.…”

“…size distribution, shape and connectivity of pores and throats) and how it affects NP retention. [19][20][21] Flow velocity is another key NP transport parameter, particularly for in situ remediation via NP injection, which is absent in continuum modelling filtration terms. This is because of difficulties in finding a functional relationship between NP retention and fluid flow velocity along with its many other dependencies, e.g.…”