Mixing is a complex process and usually involves continuous reduction of length and time scales associated with fluid(s) being mixed. Mixing is an essential process and finds widespread application in a range of industries. Due to lack of understanding of the mixing process, industries lose a significant amount of money contributed by increased power consumption and longer process times. In this work a thorough comparison of flow, mixing, and turbulence characteristics of Rushton turbine (RT) and a flotation impeller, variation of disc turbine, is performed for single phase flows using Computational Fluid Dynamics (CFD). The fluid used is water. Base case validation and model verification is performed by comparing our CFD results with widely accepted Laser Doppler Anemometry (LDA) experimental results for the Rushton Turbine. Multiple reference frame (MRF) technique, a pseudo-steady modeling method, is used to model the impeller motion on flow characteristics at different Reynolds numbers (Re). Turbulence closure is provided using RANS based two equation realizable k-ε turbulence model. Grid independence studies are carried out a sufficiently fine grid is selected to capture the fine flow structures close to the impeller, though radial velocity close to impeller was under-predicted compared to experimental results. Effects of finite impeller blade and disc thicknesses on the local flow field, which are commonly modeled as thin surfaces, are explored. Various tank geometric variations, like different impeller clearances, and impeller diameter to tank diameter ratios (DI/DT), are also investigated. The numerical results will help in understanding the effect of impeller design on local and bulk flow characteristics and turbulence anisotropy close to the impeller. The results from this work will direct the tank and impeller design choices for two phase solid-liquid flows for future investigations.
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ASME 2013 International Mechanical Engineering Congress and Exposition
November 15–21, 2013
San Diego, California, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5631-4
PROCEEDINGS PAPER
Numerical Study of Single Phase Liquid Mixing in Stirred Tanks Fitted With Rushton Turbine and Flotation Impeller Available to Purchase
Manjunath Basavarajappa,
Manjunath Basavarajappa
University of Utah, Salt Lake City, UT
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Sanja Miskovic
Sanja Miskovic
University of Utah, Salt Lake City, UT
Search for other works by this author on:
Manjunath Basavarajappa
University of Utah, Salt Lake City, UT
Sanja Miskovic
University of Utah, Salt Lake City, UT
Paper No:
IMECE2013-65277, V07AT08A047; 9 pages
Published Online:
April 2, 2014
Citation
Basavarajappa, M, & Miskovic, S. "Numerical Study of Single Phase Liquid Mixing in Stirred Tanks Fitted With Rushton Turbine and Flotation Impeller." Proceedings of the ASME 2013 International Mechanical Engineering Congress and Exposition. Volume 7A: Fluids Engineering Systems and Technologies. San Diego, California, USA. November 15–21, 2013. V07AT08A047. ASME. https://doi.org/10.1115/IMECE2013-65277
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