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Article Dans Une Revue Powder Technology Année : 2020

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

Résumé

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.
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hal-03329981 , version 1 (31-08-2021)

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François Audard, Pascal Fede, Emmanuel Belut, Jean-Raymond Fontaine, Hervé Neau, et al.. Eulerian modelling of the powder discharge of a silo: Attempting to shed some light on the origin of jet expansion. Powder Technology, 2020, 379, pp.49-57. ⟨10.1016/j.powtec.2020.10.014⟩. ⟨hal-03329981⟩
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