Transition-state theory predicts clogging at the microscale

Laar, Ties van de; Klooster, Sten ten; Schroën, Karin; Sprakel, Joris

doi:10.1038/srep28450

Cited by 38 publications

(41 citation statements)

References 32 publications

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“…The passage of many-particle systems through confined geometries like porous substrates [1,2], bottlenecks [3], or pipes [4] can be interrupted by the formation of clogs, local structures that trigger the complete arrest of the flow. Clogging, a phenomenon that resembles jamming but presents intriguing differences [5][6][7], has been recently studied for the simplest case of a single orifice in scenarios of a diverse nature, such as microbial populations [8], microparticles [9,10], droplets [11], crowds of pedestrians [12], or sheep flocks [13,14].…”

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confidence: 99%

Decoupling Geometrical and Kinematic Contributions to the Silo Clogging Process

2018

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Based on the implementation of a novel silo discharge procedure, we are able to control the grains velocities regardless of the outlet size. This allows isolating the geometrical and kinematic contributions to the clogging process. We find that, for a given outlet size, reducing the grains velocities to extremely low values leads to a clogging probability increment of almost two orders of magnitude, hence revealing the importance of particle kinematics in the silo clogging process. Then, we explore the contribution of both variables, outlet size and grains velocity, and we find that our results agree with an already known exponential expression that relates clogging probability with outlet size. We propose a modification of such expression revealing that only two parameters are necessary to fit all the data: one is related with the geometry of the problem, and the other with the grains kinematics.

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confidence: 99%

Decoupling Geometrical and Kinematic Contributions to the Silo Clogging Process

2018

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“…[12][13][14][15][16][17]). Other studies have proposed explanations of clogging using transition-state theory [18] or by relating it to jamming phenomena [19].…”

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Pore cross-talk in colloidal filtration

Liot

Singh

Bacchin

et al. 2018

Sci Rep

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Blockage of pores by particles is found in many processes, including filtration and oil extraction. We present filtration experiments through a linear array of ten channels with one dimension which is sub-micron, through which a dilute dispersion of Brownian polystyrene spheres flows under the action of a fixed pressure drop. The growth rate of a clog formed by particles at a pore entrance systematically increases with the number of already saturated (entirely clogged) pores, indicating that there is an interaction or “cross-talk” between the pores. This observation is interpreted based on a phenomenological model, stating that a diffusive redistribution of particles occurs along the membrane, from clogged to free pores. This one-dimensional model could be extended to two-dimensional membranes.

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“…Studies have determined the influence of pore geometry (width, shape, length, varying or fixed cross section) [3,5,[9][10][11], the confinement, i.e. the ratio between the particle radii and the smallest dimension of the pore [4,5,10], the polydispersity of the colloidal suspensions [12,13], the stability of the suspension with respect to the DLVO interaction potentials, between particles and the pore walls and between particles themselves [3][4][5][14][15][16], and the deformability of the particles [6].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of pore fouling by colloidal particles at the particle level

Dersoir

Schofield

Vincent

et al. 2019

Journal of Membrane Science

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Particle filtration occurs whenever particles flow through porous media such as membrane. Progressive capture or deposition of particles inside porous structure often leads to complete, and generally unwanted, fouling of the pores. Previously there has been no experimental work that has determined the particle dynamics of such a process at the pore level, since imaging the particles individually within the pores remains a challenge. Here, we overcome this issue by flowing fluorescently dyed particles through a model membrane, a microfluidic filter, imaged by a confocal microscope. This setup allows us to determine the temporal evolution of pore fouling at the particle level, from the first captured particle up to complete blocking of the pore. We show that from the very beginning of pore fouling the immobile particles inside the pore significantly participate in the capture of other flowing particles. For the first time it is determined how particles deposit inside the pore and form aggregates that eventually merge and block the pore.

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Transition-state theory predicts clogging at the microscale

Cited by 38 publications

References 32 publications

Decoupling Geometrical and Kinematic Contributions to the Silo Clogging Process

Decoupling Geometrical and Kinematic Contributions to the Silo Clogging Process

Pore cross-talk in colloidal filtration

Dynamics of pore fouling by colloidal particles at the particle level

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