Digital particle image velocimetry (DPIV) has been used to examine the flow field in a vessel agitated by an axial-flow impeller in turbulent operation. Both a pitched-blade turbine and a high-efficiency impeller were studied. Time series analysis indicates that the flow field is not steady; rather, it is subject to transients with frequencies well below the blade passage frequency (periods ranging from 40 to over 300 impeller revolutions have been observed). This result has important implications for computational modeling because current descriptions of agitated vessels are based upon time-averaged flow fields with superimposed turbulence. This modeling approach may not accurately capture the mixing associated with the low-frequency phenomena observed in this study.
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September 1997
Research Papers
A Digital Particle Image Velocimetry Investigation of Flow Field Instabilities of Axial-Flow Impellers
K. J. Myers,
K. J. Myers
Chemical and Materials Engineering, University of Dayton, Dayton, OH 45469-0246
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R. W. Ward,
R. W. Ward
Chemical and Materials Engineering, University of Dayton, Dayton, OH 45469-0246
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Andre´ Bakker
Andre´ Bakker
Chemineer, Inc., Dayton, OH 45401-1123
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K. J. Myers
Chemical and Materials Engineering, University of Dayton, Dayton, OH 45469-0246
R. W. Ward
Chemical and Materials Engineering, University of Dayton, Dayton, OH 45469-0246
Andre´ Bakker
Chemineer, Inc., Dayton, OH 45401-1123
J. Fluids Eng. Sep 1997, 119(3): 623-632 (10 pages)
Published Online: September 1, 1997
Article history
Received:
April 2, 1996
Revised:
December 5, 1996
Online:
December 4, 2007
Citation
Myers, K. J., Ward, R. W., and Bakker, A. (September 1, 1997). "A Digital Particle Image Velocimetry Investigation of Flow Field Instabilities of Axial-Flow Impellers." ASME. J. Fluids Eng. September 1997; 119(3): 623–632. https://doi.org/10.1115/1.2819290
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