The gas flow in a 3:l aspect ratio vessel agitated by triple Rushton turbines has been measured by an ultrasound Doppler probe and by means of residence time studies. Strong recirculation around each impeller is found which fits in well with the compartmentalisation found in earlier liquid mixing studies. Surprisingly, when two axial A315 impellers above a Rushton turbine were used, gas recirculation around each impeller was still found. Study of the liquid phase mixing by a decolourisation technique confirmed that the gas flow essentially destroyed the strong axial liquid flow expected. Indeed, even under unaerated conditions, compartmentalisation was found between each impeller.On a mesure B I'aide d'une sonde Doppler B ultrasons et par des etudes du temps de sejour I'ecoulement gazeux dans un rtservoir (rapport des dimensions caracteristiques de 3: 1) agite par trois turbines Rushton. On a observe une forte recirculation autour de chague turbine que correspond bien ? I la compartimentalisation trouvee dans les etudes de melange liquide prectdentes. Etonnamment, lorsqu'on utilise deux turbines axiales A3 15 au-dessus d'une turbine Rushton, on constate encore une recirculation du gaz autour de chaque turbine. L'Ctude du melange de la phase liquide par une technique de decoloration confirme que I'ecoulement gazeux detruit essentiellement le fort debit axial attendu. En effet, mCme dans des conditions non aertes, une compartimentalisation est observte entre chaque turbine.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.