Trombenbildung in unbewehrten Rührbehältern mit ein‐ und zweistufiger Rühreranordnung

Markopoulos, Joannis; Kontogeorgaki, Eleni

doi:10.1002/cite.330650714

Cited by 6 publications

References 4 publications

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Flow Patterns in Rheologically Evolving Model Fluids Produced by Hybrid Dual Mixing Systems

Espinosa-Solares¹,

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Tecante

et al. 2001

Chem. Eng. Technol.

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The flow patterns produced by two dual mixing systems composed of independently driven impellers were studied. The dual impellers included a turbine rotating at high speed (Rushton or Smith) and a slowly rotating helical ribbon agitator (HR). Visualizations and power input were used to evaluate mixing performance. The influence of the rotational speed ratio on the flow patterns was evaluated. For high shear‐thinning fluids, NT/NHR modifies the flow patterns considerably. Three typical behaviors were found with shear thinning fluids: segregation of two principal flow patterns (NT/NHR < 10), turbine dominance (NT/NHR > 10), and a well‐distributed flow pattern throughout the tank (NT/NHR = 10). For low‐viscosity fluids, the motionless HR reduced the vortex length and the T‐HR systems eliminated vortex when the impellers rotated in opposite directions at NT/NHR = 10. Finally, a relationship between the dimensionless vortex length and the Froude number is proposed for individual turbines as well as for the turbine‐motionless HR systems.

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Flow Patterns in Rheologically Evolving Model Fluids Produced by Hybrid Dual Mixing Systems

Espinosa-Solares¹,

Fuente

Tecante

et al. 2001

Chem. Eng. Technol.

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2001

Stirring

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Vortex depth in unbaffled single and multiple impeller agitated vessels

Markopoulos

Kontogeorgaki

1995

Chem Eng & Technol

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Although vortex formation is usually an undesirable phenomenon in the process industry, satisfactory process conditions and results can also be obtained in unbaffled agitated vessels in the presence of a vortex. This fact and especially the low power requirements in these systems, with their immediate relevance to the energy problem in the process industry, show the true importance of vortex formation in agitated vessels. This article reviews the literature results and the correlations proposed for the prediction of vortex depth in unbaffled agitated vessels with various types of single and multiple impeller systems and presents a critical discussion on the basis of a theoretical analysis.

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Trombenbildung in unbewehrten Rührbehältern mit ein‐ und zweistufiger Rühreranordnung

Cited by 6 publications

References 4 publications

Flow Patterns in Rheologically Evolving Model Fluids Produced by Hybrid Dual Mixing Systems

Flow Patterns in Rheologically Evolving Model Fluids Produced by Hybrid Dual Mixing Systems

Literature

Vortex depth in unbaffled single and multiple impeller agitated vessels

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