The flow field in a cylindrical container driven by a flat bladed impeller was investigated using particle image velocimetry (PIV). Three Reynolds numbers (0.02, 8, 108) were investigated for different impeller locations within the cylinder. The results showed that vortices were formed at the tips of the blades and rotated with the blades. As the blades were placed closer to the wall the vortices interacted with the induced boundary layer on the wall to enhance both regions of vorticity. Finite time lyapunov exponents (FTLE) were used to determine the lagrangian coherent structure (LCS) fields for the flow. These structures highlighted the regions where mixing occurred as well as barriers to fluid transport. Mixing was estimated using zero mass particles convected by numeric integration of the experimentally derived velocity fields. The mixing data confirmed the location of high mixing regions and barriers shown by the LCS analysis. The results indicated that mixing was enhanced within the region described by the blade motion as the blade was positioned closed to the cylinder wall. The mixing average within the entire tank was found to be largely independent of the blade location and flow Reynolds number.
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e-mail: aksheymehta@gmail.com
e-mail: santitn@unsw.edu.au
e-mail: bolltem@clarkson.edu
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June 2011
Research Papers
Characterization of Mixing in a Simple Paddle Mixer Using Experimentally Derived Velocity Fields
Akshey Mehta,
e-mail: aksheymehta@gmail.com
Akshey Mehta
Department of Mechanical and Aeronautical Engineering, Clarkson University
, 8 Clarkson Avenue, Potsdam, NY 13699
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Naratip Santitissadeekorn,
e-mail: santitn@unsw.edu.au
Naratip Santitissadeekorn
Department of Mathematics, Clarkson University
, 8 Clarkson Avenue, Potsdam, NY 13699
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Erik Bollt
e-mail: bolltem@clarkson.edu
Erik Bollt
Department of Mathematics, Clarkson University
, 8 Clarkson Avenue, Potsdam, NY 13699
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Akshey Mehta
Department of Mechanical and Aeronautical Engineering, Clarkson University
, 8 Clarkson Avenue, Potsdam, NY 13699e-mail: aksheymehta@gmail.com
Naratip Santitissadeekorn
Department of Mathematics, Clarkson University
, 8 Clarkson Avenue, Potsdam, NY 13699e-mail: santitn@unsw.edu.au
Erik Bollt
Department of Mathematics, Clarkson University
, 8 Clarkson Avenue, Potsdam, NY 13699e-mail: bolltem@clarkson.edu
J. Fluids Eng. Jun 2011, 133(6): 061202 (8 pages)
Published Online: June 16, 2011
Article history
Received:
February 22, 2011
Revised:
April 14, 2011
Online:
June 16, 2011
Published:
June 16, 2011
Citation
Bohl, D., Mehta, A., Santitissadeekorn, N., and Bollt, E. (June 16, 2011). "Characterization of Mixing in a Simple Paddle Mixer Using Experimentally Derived Velocity Fields." ASME. J. Fluids Eng. June 2011; 133(6): 061202. https://doi.org/10.1115/1.4004086
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