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2. Physical principles associated with flow
Appropriate silo sizing for bulk flow depends on silo geometry and powder flow properties. In particular, the flow is conditioned by the ratio between two antagonistic forces which result respectively :
the stress field generated by the weight of the product, which tends to consolidate the medium;
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mechanical properties of the solid.
Despite many similarities with liquids, the flow of powders is not governed by the same physical principles or phenomenological laws. For a liquid, viscosity is a perfect indicator of its flow, whereas for a solid, even in a dispersed state, the notion of viscosity loses all meaning. As with massive solids, for a consolidated powder, flow occurs if one part of the powder can slide relative to another. Thus, powder flow is associated with its resistance...
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Physical principles associated with flow
Silo calculation and sizing
Bibliography
Websites
Events
Science et Technologie des Poudres Type: symposium Periodicity: three years Next event: 2012, Toulouse
Congrès de la Société Française du Génie des Procédés (SFGP) Type: congress Frequency: every two years Next event: November 29 - December 1 - 2011, Lille
International Granulation workshop Type: workshop + symposium Frequency: 2 years...
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ESTEVE S.A.S. http://www.esteve.fr
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Standards and norms
- Eurocode 1: actions on structures – Part 4: silos and tanks – National Annex to NF EN 1991-4: 2007 – Silos and tanks - NF EN 1992-1-4/NA - 2007
- Steel construction – Steel silos: Calculation of actions in cells - NF P22-630 - 1992
- Specific characteristics of bulk products used in silo storage – Determination and representation of flow properties - FEM 2381 - 1986
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