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A Study of the Mixing Performance of Different Impeller Designs in Stirred Vessels Using Computational Fluid Dynamics

College of Engineering, Nanjing Agricultural University Jiangsu Province, Nanjing 210031, China
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Designs 2018, 2(1), 10; https://doi.org/10.3390/designs2010010
Received: 8 January 2018 / Revised: 6 March 2018 / Accepted: 6 March 2018 / Published: 8 March 2018
(This article belongs to the Special Issue Challenges and Progress in Turbomachinery Design)
Design and operation of mixing systems using agitated vessels is a difficult task due to the challenge of obtaining accurate information on impeller-induced turbulence. The use of Computational Fluid Dynamics (CFD) can provide detailed understanding of such systems. In this study, experimental tests and computational fluid dynamics simulations were performed to examine the flow characteristics of four impeller designs (anchor, saw-tooth, counter-flow and Rushton turbine), in achieving solution homogeneity. The impellers were used to mix potassium sulfate granules, from which values of electrical conductivity of the solution were measured and used to estimate the distribution pattern of dissolved solid concentrations within the vessel. CFD models were developed for similar mixing arrangement using commercial software, ANSYS Fluent 18.1 solver and the standard k-epsilon (ε) turbulence model. The Multiple Reference Frame (MRF) approach was used to simulate the impeller rotation. Velocity profiles generated from the simulations were in good agreement with the experimental predictions, as well as with results from previous studies. It was concluded that, through CFD analysis, detailed information can be obtained for optimal design of mixing apparatus. These findings are relevant in choosing the best mixing equipment and provides a basis for scaling up mixing operations in larger systems. View Full-Text
Keywords: impeller design; turbulent mixing; homogeneity; computational fluid dynamics; ANSYS fluent; multiple reference frame; velocity profile impeller design; turbulent mixing; homogeneity; computational fluid dynamics; ANSYS fluent; multiple reference frame; velocity profile
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MDPI and ACS Style

Torotwa, I.; Ji, C. A Study of the Mixing Performance of Different Impeller Designs in Stirred Vessels Using Computational Fluid Dynamics. Designs 2018, 2, 10. https://doi.org/10.3390/designs2010010

AMA Style

Torotwa I, Ji C. A Study of the Mixing Performance of Different Impeller Designs in Stirred Vessels Using Computational Fluid Dynamics. Designs. 2018; 2(1):10. https://doi.org/10.3390/designs2010010

Chicago/Turabian Style

Torotwa, Ian, and Changying Ji. 2018. "A Study of the Mixing Performance of Different Impeller Designs in Stirred Vessels Using Computational Fluid Dynamics" Designs 2, no. 1: 10. https://doi.org/10.3390/designs2010010

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