Mechanism behind Erosive Bursts In Porous Media

Jäger, Robin; Mendoza, M.; Herrmann, Hans J.

doi:10.1103/physrevlett.119.124501

Cited by 24 publications

(37 citation statements)

References 24 publications

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“…Note that this might only be true for particles close to pore size and short range forces. Our results confirm our previous finding [5] that the hydraulic pressure gradient acting on deposit is an erosive mechanism that can lead to erosive bursts. The critical pressure gradient causing an erosive burst was studied and we found that it depends strongly on the particle size and pore length.…”

Section: Discussionsupporting

confidence: 92%

“…One goal when developing this model for erosion and deposition at microscopic scale was to study if we could define a conclusive criterion for the pressure that initiates an erosive burst. In our previous model [5] we assumed that this critical pressure is proportional to the width of the deposit that has to be dislodged…”

Section: A Critical Erosive Pressurementioning

confidence: 99%

“…Bianchi et al [3,4] recently discovered that critical bursts in filters follow a power-law and studied their statistical properties. With a theoretical model we investigated these erosive bursts using computer simulations [5] and found that they occur when the local fluid pressure overcomes the forces keeping deposited matter in place and blocked pathways get unclogged. In this model we took several simplifying assumptions, namely, the motion of suspended particles was described by a concentration field, and thus deposits are continuous matter rather than a conglomerate of individual particles.…”

Section: Introductionmentioning

confidence: 99%

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Clogging at pore scale and pressure-induced erosion

2018

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Introducing a model to study deposition and erosion of single particles at microscopic scale, we investigate the clogging and erosive processes in a pore. The particle diameter, concentration, and adhesive forces rule the way particles are deposited, and therefore, characterize the clogging process. We study the hydraulic pressure that induces erosive bursts and conclude that this pressure depends linearly on the deposited volume and inversely on the pores' diameter. While cohesion does not play an important role for erosive bursts, the adhesion is the main force initiating clogging and when overcome by the hydraulic pressure, erosive bursts are triggered. Finally, we show how the magnitude of erosive bursts depends on the pore length, particle diameter and pore size.

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Section: Discussionsupporting

confidence: 92%

Section: A Critical Erosive Pressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Clogging at pore scale and pressure-induced erosion

2018

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“…In turn, the resolution of the calculation imposes restrictions on the largest system size that we are able to study. Finite size effects for the studied systems may result in small anisotropies in the permeability tensor [15], but recent studies show that transport in complex porous geometries can be reasonably well captured if the size of the system is roughly 10 times larger than the pore size [23,41,48,49].…”

Section: Lattice Boltzmann Simulationsmentioning

confidence: 99%

Fluid flow through packings of elastic shells

Gniewek

Hallatschek

2019

Phys. Rev. E

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Fluid transport in porous materials is commonly studied in geological samples (soil, sediments etc.) or idealized systems, but the fluid flow through compacted granular materials, consisting of substantially strained granules, remains relatively unexplored. As a step towards filling this gap, we study a model of liquid transport in packings of deformable elastic shells using Finite Element and Lattice-Boltzmann methods. We find that the fluid flow abruptly vanishes as the porosity of the material falls below a critical value, and the flow obstruction exhibits features of a percolation transition. We further show that the fluid flow can be captured by a simplified permeability model in which the complex porous material is replaced by a collection of disordered capillaries, which are distributed and shaped by the percolation transition. To that end, we numerically explore the divergence of hydraulic tortuosity τH and the decrease of a hydraulic radius R h as the percolation threshold is approached. We interpret our results in terms of scaling predictions derived from the percolation theory applied to random packings of spheres.

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“…On the other hand permeability jumps can occur, when critical pores are opened due to erosion. Fluid mechanics simulations recently revealed the mechanism behind the erosive bursts to be the pressure differences up-and down-stream from a clogged zone [17]. The subsequent flow reorganization results in clogging of other channels and thus in a different channel network.…”

mentioning

confidence: 99%

Tomographic Study of Internal Erosion of Particle Flows in Porous Media

et al. 2018

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In particle-laden flows through porous media, porosity and permeability are significantly affected by the deposition and erosion of particles. Experiments show that the permeability evolution of a porous medium with respect to a particle suspension is not smooth, but rather exhibits significant jumps followed by longer periods of continuous permeability decrease. Their origin seems to be related to internal flow path reorganization by avalanches of deposited material due to erosion inside the porous medium. We apply neutron tomography to resolve the spatio-temporal evolution of the pore space during clogging and unclogging to prove the hypothesis of flow path reorganization behind the permeability jumps. This mechanistic understanding of clogging phenomena is relevant for a number of applications from oil production to filters or suffosion as the mechanisms behind sinkhole formation.Comment: 18 pages, 9 figure

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Mechanism behind Erosive Bursts In Porous Media

Cited by 24 publications

References 24 publications

Clogging at pore scale and pressure-induced erosion

Clogging at pore scale and pressure-induced erosion

Fluid flow through packings of elastic shells

Tomographic Study of Internal Erosion of Particle Flows in Porous Media

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