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Ecoulement confiné d'un matériau granulaire en interaction avec un gaz, application à la relocalisation du combustible nucléaire.

Alexandre Martin 1
1 PMMG - Physique et Mécanique des Milieux Granulaires
LMGC - Laboratoire de Mécanique et Génie Civil
Abstract : In this work, we investigate particle-gas two-phase flows in the jamming regime where the flow stops in finite time. In this regime, which occurs quite often in nature and industrial applications, the flow is stochastic and needs therefore to be characterized by the jamming probability as well as the flow rate and its fluctuations that depend on the confining geometry, granular microstructure and gas properties. We developped a numerical approach based on the coupling of the Non Smooth Contact Dynamics for the solid phase and a mesoscopic method for the gas phase. We find that the flow rate as a function of the opening is well fit by a power law in agreement with reported experimental data. The presence of a gas affects only the mean flow rate, the flow statistics being sensibly the same as in the absence of the gas. We apply our quantitative statistical results in order to estimate the relocation rate of fragmented nuclear fuel inside its cladding tube as a result of a local balloon caused by an accident (loss-of-coolant accident).
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https://tel.archives-ouvertes.fr/tel-00472229
Contributor : Alexandre Martin <>
Submitted on : Friday, April 9, 2010 - 8:39:35 PM
Last modification on : Wednesday, May 29, 2019 - 10:04:02 AM
Long-term archiving on: : Tuesday, September 14, 2010 - 6:11:27 PM

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  • HAL Id : tel-00472229, version 1

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Alexandre Martin. Ecoulement confiné d'un matériau granulaire en interaction avec un gaz, application à la relocalisation du combustible nucléaire.. Mécanique [physics.med-ph]. Université Montpellier II - Sciences et Techniques du Languedoc, 2010. Français. ⟨tel-00472229⟩

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