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Whirl Instability of a Rotating Impeller in a Baffled Mixing Vessel

[+] Author Affiliations
G. C. Cudmore, A. Gordon L. Holloway, Andrew G. Gerber

University of New Brunswick, Fredericton, NB, Canada

Paper No. PVP2013-97449, pp. V004T04A043; 10 pages
  • ASME 2013 Pressure Vessels and Piping Conference
  • Volume 4: Fluid-Structure Interaction
  • Paris, France, July 14–18, 2013
  • Conference Sponsors: Pressure Vessels and Piping Division, Nondestructive Evaluation Engineering Division
  • ISBN: 978-0-7918-5568-3
  • Copyright © 2013 by ASME


A novel linear model of vibration for industrial mixing equipment is introduced. The model includes contributions to the mass, damping and stiffness coefficients from fluid forces on the impeller, in addition to structural elements. The fluid added mass, damping and stiffness model coefficients were derived from Large Eddy Simulation (LES) of turbulent flow in a mixer with a pitched blade impeller undergoing small prescribed circular orbits. Model predictions of impeller whirl instability were compared to experimental data with good agreement. The simplicity and speed of the new model make it of use for on-line diagnostics and operational planning.

Copyright © 2013 by ASME
Topics: Impellers , Vessels , Whirls



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