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Eulerian modelling of the powder discharge of a silo: Attempting to shed some light on the origin of jet expansion

Audard, François and Fede, Pascal and Belut, Emmanuel and Fontaine, Jean-Raymond and Neau, Hervé and Simonin, Olivier Eulerian modelling of the powder discharge of a silo: Attempting to shed some light on the origin of jet expansion. (2020) Powder Technology, 379. 49-57. ISSN 0032-5910

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Official URL: https://doi.org/10.1016/j.powtec.2020.10.014


Powder discharging from a silo provokes an emission of dust. To understand and prevent this source of danger,3D simulations of a silo dischargewere performed using an Euler-Euler approach. The impact of the coupling between the flow inside the silo and the granular jet in free-fall is analyzed. Results show that the solid mass flow rate is correctly predicted and that gas back-flowing at the hopper exhaust appears responsible for the formation of a fluctuating and radially expanding jet. However, the radial expansion of the free-falling jet is underestimated. Stochastic fluctuations of the particles velocity at the hopper exhaust are introduced to evaluate their effect on the downstream development of the free-falling jet. These fluctuations are found capable of generating a development of the jet similar to that observed experimentally. This suggests that the granular flow conditions at the hopper exhaust are responsible for the further dispersion of powder.

Item Type:Article
HAL Id:hal-03329981
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Institut National de Recherche et Sécurité - INRS (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
CALMIP (allocation 2020-0111), GENCI-CINES (Grant 2015- c20152b6012)
Deposited On:31 Aug 2021 12:10

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