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

[+] Author and Article Information
K. J. Myers, R. W. Ward

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

André Bakker

Chemineer, Inc., Dayton, OH 45401-1123

J. Fluids Eng 119(3), 623-632 (Sep 01, 1997) (10 pages) doi:10.1115/1.2819290 History: Received April 02, 1996; Revised December 05, 1996; Online December 04, 2007


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.

Copyright © 1997 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.






Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In