1. Eulerian modelling of the powder discharge of a silo: Attempting to shed some light on the origin of jet expansion
- Author
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Olivier Simonin, François Audard, Jean-Raymond Fontaine, Hervé Neau, Emmanuel Belut, Pascal Fede, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National de Recherche et Sécurité - INRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, and Institut national de recherche et de sécurité (Paris) (INRS (Paris))
- Subjects
Jet (fluid) ,Materials science ,[SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment ,General Chemical Engineering ,Mécanique des fluides ,Flow (psychology) ,Eulerian path ,Milieux fluides et réactifs ,02 engineering and technology ,Mechanics ,021001 nanoscience & nanotechnology ,[SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] ,Volumetric flow rate ,symbols.namesake ,Flow conditions ,020401 chemical engineering ,Dust emissionGranular instabilityGranular flowPowder dischargeFrictional viscosity ,Silo ,symbols ,Coupling (piping) ,Dust emission Granular instability Granular flow Powder discharge Frictional viscosity ,0204 chemical engineering ,0210 nano-technology ,Dispersion (water waves) - Abstract
International audience; 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 onthe 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.
- Published
- 2020
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