Journal ArticleDOI
A theoretical analysis of colloid attachment and straining in chemically heterogeneous porous media.
TLDR
A balance of applied hydrodynamic and resisting adhesive torques was conducted over a chemically heterogeneous porous medium to determine the fraction of the solid surface area that contributes to colloid immobilization (S(f)*) under unfavorable attachment conditions.Abstract:
A balance of applied hydrodynamic (TH) and resisting adhesive (TA) torques was conducted over a chemically heterogeneous porous medium that contained random roughness of height hr to determine the fraction of the solid surface area that contributes to colloid immobilization (Sf*) under unfavorable attachment conditions. This model considers resistance due to deformation and the horizontal component of the adhesive force (FAT), spatial variations in the pore scale velocity distribution, and the influence of hr on lever arms for TH and TA. Values of Sf* were calculated for a wide range of physicochemical properties to gain insight into mechanisms and factors influencing colloid immobilization. Colloid attachment processes were demonstrated to depend on solution ionic strength (IS), the colloid radius (rc), the Young’s modulus (K), the amount of chemical heterogeneity (P+), and the Darcy velocity (q). Colloid immobilization was also demonstrated to occur on a rough surface in the absence of attachment. In th...read more
Citations
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Journal ArticleDOI
Predicting colloid transport through saturated porous media: A critical review
I. L. Molnar,William P. Johnson,Jason I. Gerhard,Clinton S. Willson,Denis M. O'Carroll,Denis M. O'Carroll +5 more
TL;DR: A review of existing knowledge of colloid transport and retention in water-saturated porous media can be found in this paper, where the authors highlight the importance of physical and chemical heterogeneities on colloid-surface repulsion, and highlight outstanding challenges and future research opportunities.
Journal ArticleDOI
Progress in particle resuspension from rough surfaces by turbulent flows
TL;DR: A detailed review of the experimental works brings out the essential mechanisms and particle resuspension is shown to result from a balance between particle-fluid interactions and particle-surface interactions influenced by surface heterogeneities (roughness).
Journal ArticleDOI
Critical role of surface roughness on colloid retention and release in porous media.
TL;DR: Results demonstrated that the density and height of NSR significantly influenced the interaction energy parameters and consequently the extent and kinetics of colloid retention and release, and yielded a much weaker primary minimum interaction compared with that of smooth surfaces.
Journal ArticleDOI
Colloid release and clogging in porous media: Effects of solution ionic strength and flow velocity.
Saeed Torkzaban,Scott A. Bradford,Joanne Vanderzalm,Bradley M. Patterson,Brett Harris,Henning Prommer +5 more
TL;DR: Comparison of the fitted and experimentally measured effluent colloid concentrations and associated changes in the core permeability showed good agreement, indicating that the essential physics were accurately captured by the model.
Journal ArticleDOI
Coupled effects of hydrodynamic and solution chemistry on long-term nanoparticle transport and deposition in saturated porous media
Salini Sasidharan,Salini Sasidharan,Saeed Torkzaban,Scott A. Bradford,Peter Dillon,Peter G. Cook,Peter G. Cook +6 more
TL;DR: In this paper, the long-term breakthrough curves (BTCs) were obtained to obtain the full deposition kinetics and the fraction of the solid surface area (Sf) that was available for NP deposition.
References
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Book
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TL;DR: The forces between atoms and molecules are discussed in detail in this article, including the van der Waals forces between surfaces, and the forces between particles and surfaces, as well as their interactions with other forces.
Journal ArticleDOI
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TL;DR: In this paper, the influence of surface energy on the contact between elastic solids is discussed and an analytical model for its effect upon the contact size and the force of adhesion between two lightly loaded spherical solid surfaces is presented.
Journal ArticleDOI
Effect of contact deformations on the adhesion of particles
TL;DR: In this article, it was shown that despite the van der Waals' forces being capable of increasing the elastic contact area between the ball and the plane, the force that is required to overcome the molecular forces arising when the contact is broken does not increase thereby.