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Jamming/flowing transition of non-Brownian particles suspended in a iso-density fluid flowing in a 2D rectangular duct

Abstract : We present the results of an experimental study on the jamming/flowing transition. A suspension of neutrally buoyant large particles flows in an horizontal rectangular duct, where an artificial restriction triggers jamming. We show that the avalanche distribution size is exponential, that is memoryless. We further demonstrate that the avalanche size diverges when the restriction size approaches a critical value and that this divergence is well described by a power law. The parameters (critical opening size and divergence velocity) are compared to literature values and show a strong similarity with others systems. Another result of this paper is the study of the influence of the particle morphology. We show that, for a moderate restriction size, the dead-zone formed right upstream of the restriction is larger for angular particles but, paradoxically, that the avalanche size is larger for polyhedra compared to spheres by at least one order of magnitude.
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Submitted on : Monday, July 31, 2017 - 3:43:53 PM
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Maxym Burel, Sylvain Martin, Olivier Bonnefoy. Jamming/flowing transition of non-Brownian particles suspended in a iso-density fluid flowing in a 2D rectangular duct. Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media, LMGC, CNRS, Université de Montpellier; IATE, INRA, Montpellier, Jul 2017, Montpellier, France. ⟨10.1051/epjconf/201714003086⟩. ⟨hal-01570734⟩

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