The design and analysis of impellers for mixing applications such as stirred tank reactors (STR) have significant application in many engineering processes. In particular, the evaluation of the turbulent flow boundary conditions immediately around a model impeller has been examined using flow visualization, laser Doppler anemometry (LDA) and particle image velocimetry (PIV). Mean and fluctuating velocities are presented for all three velocity components. Good agreement between LDA and PIV measurements was obtained once an optimized PIV arrangement was defined. Turbulence parameters such as kinetic energy, dissipation, and length scales are estimated from the measurements. Several approaches to evaluating dissipation were used. Triggered PIV measurements were used to evaluate the variation in radial and tangential velocities in the entire planes above and below the impeller at constant axial distances. The size and orientation of the vortices shed from the impeller blade tips and the corresponding regions of high kinetic energy and dissipation indicate the importance of these structures in mixing.
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December 2001
Technical Papers
Analysis of the Immediate Boundary Conditions of an Axial Flow Impeller
David A. Johnson
David A. Johnson
Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
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David A. Johnson
Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division December 14, 2000; revised manuscript received August 8, 2001 Associate Editor: A. K. Prasad.
J. Fluids Eng. Dec 2001, 123(4): 771-779 (9 pages)
Published Online: August 8, 2001
Article history
Received:
December 14, 2000
Revised:
August 8, 2001
Citation
Johnson, D. A. (August 8, 2001). "Analysis of the Immediate Boundary Conditions of an Axial Flow Impeller ." ASME. J. Fluids Eng. December 2001; 123(4): 771–779. https://doi.org/10.1115/1.1412846
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