Clogging in constricted suspension flows

Alvaro Marin, Henri Lhuissier, Massimiliano Rossi, Christian Kähler

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Abstract

The flow of a charged-stabilized suspension through a single constricted channel is studied experimentally by tracking the particles individually. Surprisingly, the behavior is found to be qualitatively similar to that of inertial dry granular systems: For small values of the neck-to-particle size ratio (D/d < 3), clogs form randomly as arches of the particle span the constriction. The statistics of the clogging events are Poissonian as reported for granular systems and agree for moderate particle volume fraction (φ ≈ 20%) with a simple stochastic model for the number of particles at the neck. For larger neck sizes (D/d > 3), even at the largest φ (≈ 60%) achievable in the experiments, an uninterrupted particle flowis observed, which resembles that of an hourglass. This particularly small value of D/d ( 3) at the transition to a practically uninterrupted flow is attributed to the low effective friction between the particles, achieved by the particle’s functionalization and lubrication.
Original languageEnglish
Article number021102
Pages (from-to)021102-1 - 021102-5
Number of pages5
JournalPhysical review E: covering statistical, nonlinear, biological, and soft matter physics
Volume97
Issue number2
DOIs
Publication statusPublished - 7 Feb 2018

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plugging
Functionalization
Lubrication
Particle Size
Friction
lubrication
friction
Experiment

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Marin, Alvaro ; Lhuissier, Henri ; Rossi, Massimiliano ; Kähler, Christian. / Clogging in constricted suspension flows. In: Physical review E: covering statistical, nonlinear, biological, and soft matter physics. 2018 ; Vol. 97, No. 2. pp. 021102-1 - 021102-5.
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abstract = "The flow of a charged-stabilized suspension through a single constricted channel is studied experimentally by tracking the particles individually. Surprisingly, the behavior is found to be qualitatively similar to that of inertial dry granular systems: For small values of the neck-to-particle size ratio (D/d < 3), clogs form randomly as arches of the particle span the constriction. The statistics of the clogging events are Poissonian as reported for granular systems and agree for moderate particle volume fraction (φ ≈ 20{\%}) with a simple stochastic model for the number of particles at the neck. For larger neck sizes (D/d > 3), even at the largest φ (≈ 60{\%}) achievable in the experiments, an uninterrupted particle flowis observed, which resembles that of an hourglass. This particularly small value of D/d ( 3) at the transition to a practically uninterrupted flow is attributed to the low effective friction between the particles, achieved by the particle’s functionalization and lubrication.",
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Clogging in constricted suspension flows. / Marin, Alvaro ; Lhuissier, Henri; Rossi, Massimiliano; Kähler, Christian.

In: Physical review E: covering statistical, nonlinear, biological, and soft matter physics, Vol. 97, No. 2, 021102, 07.02.2018, p. 021102-1 - 021102-5.

Research output: Contribution to journalArticleAcademicpeer-review

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AB - The flow of a charged-stabilized suspension through a single constricted channel is studied experimentally by tracking the particles individually. Surprisingly, the behavior is found to be qualitatively similar to that of inertial dry granular systems: For small values of the neck-to-particle size ratio (D/d < 3), clogs form randomly as arches of the particle span the constriction. The statistics of the clogging events are Poissonian as reported for granular systems and agree for moderate particle volume fraction (φ ≈ 20%) with a simple stochastic model for the number of particles at the neck. For larger neck sizes (D/d > 3), even at the largest φ (≈ 60%) achievable in the experiments, an uninterrupted particle flowis observed, which resembles that of an hourglass. This particularly small value of D/d ( 3) at the transition to a practically uninterrupted flow is attributed to the low effective friction between the particles, achieved by the particle’s functionalization and lubrication.

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