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• W2004111539 abstract "Batch mixing of viscous fluids with helical-ribbon agitators in 2.4 liter and 13 liter vessels has been studied for agitator speeds up to 200 RPM. Seven different agitators of different dimensions were employed in this work. Mixing times were measured using a decoloration technique and circulation times were determined by the tracer bead method. In addition, velocity profiles were obtained from streak photographs using selective illumination of the vessel and PVC powder as tracer particles. It was found that the mixing times of Newtonian fluids, which agreed with previously published data, were considerably (3 to 7 times) shorter than those of the viscoelastic fluids. The mixing time was strongly affected by the fluids' elasticity; increasing as the fluid elasticity increased. The velocity profiles were qualitatively similar for all the fluids but showed decreased axial circulation and increased circumferential flow as fluid elasticity increased. However, mixing is not only a function of the axial circulation (impeller pumping rate) but also is a function of the perturbations superimposed on the main flow. A simple, first approximation model based on the impeller geometry and flow patterns is proposed to correlate the circulation capacity and mixing time data for the various geometries studied. On a étudié, en employant des vitesses d'agitation atteignant 200 tours à la minute, le mélange discontinu de fluides visqueux assuré par des agitateurs à ruban hélicoïdal dans des vaisseaux de 2.4 litres et 13 litres; on a utilisé à cette fin sept agitateurs différents de dimensions variées. On a mesuré les temps de mélange par une méthode de décoloration et déterminé les temps de circulation au moyen d'une méthode à base de perles marquées. On a, en outre, obtenu des profils de vitesse à partir de photographies avec stries, en utilisant un éclairage sélectif du vaisseau et de la poudre de chlorure de polyvinyle qui servait pour les particules marquées. On a trouvé que les temps de mélange des fluides newtoniens, qui correspondaient à ceux qui ont déjà été publiés, étaient bien plus faibles (3 à 7 fois) que les temps de mélange des fluides visco-élastiques. L'élasticité des fluides a considérablement affecté le temps de mélange, qui augmentait avec celleci. Les profils de vitesse se sont avérés qualitativement semblables pour tous les fluides, mais ils ont indiqué une circulation axiale moindre et un écoulement circonférentiel accru, à mesure que l'élasticité des fluides augmentait. Toutefois, le mélange est une fonction non seulement de la circulation axiale, (taux de pompage du rotor), mais aussi des perturbations sur-imposées sur l'écoulement principal. On propose un modèle simple et fournissant une première approximation, lequel est basé sur la géometrie du rotor et les types d'écoulement, en vue d'établir des corrélations entre les résultats relatifs à la circulation et aux temps de mélange, dans le cas des diverses formes géométriques étudiées." @default.
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• W2004111539 date "1976-06-01" @default.
• W2004111539 modified "2023-10-18" @default.
• W2004111539 title "Mixing of viscoelastic fluids with helical-ribbon agitators. I - Mixing time and flow patterns" @default.
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• W2004111539 doi "https://doi.org/10.1002/cjce.5450540303" @default.
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