Clogging of microfluidic systems

Dressaire, Emilie; Sauret, Alban

doi:10.1039/c6sm01879c

Cited by 252 publications

(224 citation statements)

References 120 publications

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“…This clogging phenomenon appears in many different systems with typical sizes ranging over several orders of magnitude. At very small spatial scales, clogging leads to intermittent flow when a dense suspension of microbes [1] or microparticles [2][3][4] passes through a constriction in a microchannel. Clogging is also behind dramatic cases of deaths when crowds in panic are evacuated through small emergency exits [5].…”

Section: Introductionmentioning

confidence: 99%

Linking bottleneck clogging with flow kinematics in granular materials: The role of silo width

et al. 2017

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We demonstrate experimentally that clogging in a silo correlates with some features of the particle velocities in the outlet proximities. This finding, that links the formation of clogs with a kinematic property of the system, is obtained by looking at the effect that the position of the lateral walls of the silo has on the flow and clogging behavior. Surprisingly, the avalanche size depends nonmonotonically on the distance of the outlet from the lateral walls. Apart from evidencing the relevance of a parameter that has been traditionally overlooked in bottleneck flow, this nonmonotonicity supposes a benchmark with which to explore the correlation of clogging probability with different variables within the system. Among these, we find that the velocity of the particles above the outlet and their fluctuations seem to be behind the nonmonotonicity in the avalanche size versus wall distance curve.

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Section: Introductionmentioning

confidence: 99%

Linking bottleneck clogging with flow kinematics in granular materials: The role of silo width

et al. 2017

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“…Typically, pore clogging is understood to be most likely to occur when the size of the particles is comparable to the pore size, such that steric effects like sieving or bridging can induce pore clogging [22]. In contrast, particles that are much smaller than the size of the pore are able to clog the pore only via particle aggregation, which is a much slower process than clogging driven by steric effects [22,23].…”

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confidence: 99%

Accumulation of Colloidal Particles in Flow Junctions Induced by Fluid Flow and Diffusiophoresis

et al. 2017

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The flow of solutions containing solutes and colloidal particles in porous media is widely found in systems including underground aquifers, hydraulic fractures, estuarine or coastal habitats, water filtration systems, etc. In such systems, solute gradients occur when there is a local change in the solute concentration. While the effects of solute gradients have been found to be important for many applications, we observe an unexpected colloidal behavior in porous media driven by the combination of solute gradients and the fluid flow. When two flows with different solute concentrations are in contact near a junction, a sharp solute gradient is formed at the interface, which may allow strong diffusiophoresis of the particles directed against the flow. Consequently, the particles accumulate near the pore entrance, rapidly approaching the packing limit. These colloidal dynamics have important implications for the clogging of a porous medium, where particles that are orders of magnitude smaller than the pore width can accumulate and block the pores within a short period of time. We also show that this effect can be exploited as a useful tool for preconcentrating biomolecules for rapid bioassays.

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“…However, when only epoxy was mixed with nickel particles, the paste jammed, unable to fill the mold. Jamming or bridging typically occurs at solid volume fractions between 0.2–0.6 . However, the solid volume fraction was only 0.17, but passing a small orifice (e. g. syringe mouth) is reported to increase the solid volume fraction .…”

Section: Resultsmentioning

confidence: 99%

Indirect 3D Printed Electrode Mixers

et al. 2018

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Electrode mixers are ordered 3D flow‐through structures with mixing properties that at the same time act as electrode. Because of their mixing properties, these structures enhance mass transfer at the electrode surface, increasing the limiting‐current plateau. Typically operating at this plateau, the productivity of electrochemical reactors is limited by the mass transport of the reagents. This work presents the fabrication of all‐metal electrode mixers through an indirect 3D printing method. Whereas other techniques suffer from design limitations or come with high capital cost, the proposed rapid prototyping method overcomes these limitations. Using this method, a helical and a cubic electrode mixer was fabricated and their mass transfer properties were characterized and compared to a flat electrode by the limiting current method. Increasing the mass transfer up to 47 % the standard flat electrode is outperformed, demonstrating the valorization potential of electrode mixers and the indirect 3D printing method.

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Clogging of microfluidic systems

Cited by 252 publications

References 120 publications

Linking bottleneck clogging with flow kinematics in granular materials: The role of silo width

Linking bottleneck clogging with flow kinematics in granular materials: The role of silo width

Accumulation of Colloidal Particles in Flow Junctions Induced by Fluid Flow and Diffusiophoresis

Indirect 3D Printed Electrode Mixers

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