A Digital Particle Image Velocimetry Investigation of Flow Field Instabilities of Axial-Flow Impellers-Reference-Cited by-同舟云学术

A Digital Particle Image Velocimetry Investigation of Flow Field Instabilities of Axial-Flow Impellers

Published:1997-09-01 Issue:3 Volume:119 Page:623-632
ISSN:0098-2202
Container-title:Journal of Fluids Engineering
language:en
Short-container-title:

Author:

Myers K. J.¹,Ward R. W.¹,Bakker Andre´²

Affiliation:

1. Chemical and Materials Engineering, University of Dayton, Dayton, OH 45469-0246

2. Chemineer, Inc., Dayton, OH 45401-1123

Abstract

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.

Publisher

ASME International

Subject

Mechanical Engineering

Link

http://asmedigitalcollection.asme.org/fluidsengineering/article-pdf/119/3/623/5482400/623_1.pdf

Reference13 articles.

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3. Bru˚ha, O., Forˇt, I., and Smolka, P., 1994, “Flow Transition Phenomenon in an Axially Agitated System,” Proceedings of the Eighth European Conference on Mixing (IChemE Symposium Series Number 136), pages 121–128, Cambridge, United Kingdom, Sept. 21-23.

4. Bru˚ha O. , ForˇtI., and SmolkaP., 1995, “Phenomenon of Turbulent Macro-Instabilities in Agitated Systems,” Collect. Czech. Chem. Commun., Vol. 60, pp. 85–94.

5. Chapple, D., and Kresta, S., 1993, “The Effect of Geometry on the Stability of Flow Patterns in Stirred Tanks,” paper presented at Mixing XIV, Santa Barbara, California, June 20-25.

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