Scaled Physical Modeling of the Dynamics of Granular Flow in Hopper Silos
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Notice bibliographique
Résumé
To understand the challenges on grain flow during handling in hoppers and silos require better understanding of the granular physical flow characteristics through experiments done at large scale. However, due to the complexity of the large, controlled tests, scaled models are often used to study the behaviour. Very few of these model scale studies had been done appropriately taking the effects of gravity on silo discharge into account. This subject has also been widely investigated in different areas of geotechnical engineering related to soil erosion, land slides, and dynamic liquefaction. Granular flow rate and the dynamics of the flow are also studied in fields like chemical, mining and material engineering. Two conditions for scaled model testing have been investigated in this study: the dynamics of the granular flow at natural gravity and enhanced gravities of 1.9, 3.8, 7.7 and 11.7 g conducted in a centrifuge. The granular outflow tests have covered the features of the granular shear flow, outflow rates and deformation patterns. The observed granular flow rates (W) for the novel half hopper model under natural and enhanced gravities were then estimated from the Beverloo et al. (1961) relations and were compared. Particle image velocimetry was used to study the vertical particle velocity profiles and the flow deformation patterns during the natural and enhanced gravity tests. The granular flow rate was found to be directly proportional to the ratio of orifice size and influenced by the soil particle size (W ∝ Do/d). However, this comparison was found to be more applicable for cohesionless soils compared to soils with small cohesions. The results in this study show that the flow mechanisms in a cylindrical hopper are quite complex and vary both temporally and spatially. Three distinct zones of behaviour were observed from the particle image velocimetry analysis: a) an upper inflow zone, b) a narrow vertical funnel flow zone and c) a near static stagnant zone. For the enhanced gravity tests, the mass flow direction inside and outside of the hopper was observed to be influenced by the resultant inclined vector of the enhanced gravity due to the combined effect of the centrifuge rotation and Earth’s gravity.
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Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,002 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découle