Abstract
This paper shows that a deposited distribution of nanoparticles transported by a liquid through a porous media is akin to a traveling wave propagating with a shape and velocity depending on the flow rate and the availability of particles with regard to the adsorption capacity. Confinements effects due to smaller pore size regions induce delayed deposition also described by traveling waves
Highlights
Colloidal particles from industrial or natural sources propagate and may deposit and alter the environment they flow through
The physical problem is complex since particle transport and retention on the walls of the porous media are a function of the specific interactions and of the way the particles access the surfaces
We show that a minimal number of ingredients may be used to describe the principles of the propagation and deposition of colloids in porous medium, and that such an approach leads a straightforward quantification of the process in simple physical terms
Summary
Colloidal particles from industrial or natural sources propagate and may deposit and alter the environment they flow through. Predicting particle transport and deposition in these porous media is the key to solve these problems. All these applications involve suspensions of submicronic particles (chemicals, heavy metals, microorganisms, engineered remediation agents) flowing through saturated porous matrices with a diversity of geometries and porosities, with some possibility of adsorption thanks to van der Waals or electrostatic attraction. The physical problem is complex since particle transport and retention on the walls of the porous media are a function of the specific interactions and of the way the particles access the surfaces. Many studies described in details the possible interactions relying on the classical DLVO theory and/or taking into account specific hydrodynamic processes around the solid walls of porous
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