Journal of Fluids Engineering

Volume: Page/CID:

Creation and Maintenance of Cavities Under Horizontal Surfaces in Steady and Gust Flows
An experimental study of air supply to bottom cavities stabilized within a recess under a horizontal surface has been carried out in a specially designed water tunnel. The air supply necessary for cre...

CFD Modeling and X-Ray Imaging of Biomass in a Fluidized Bed
Computational modeling of fluidized beds can be used to predict the operation of biomass gasifiers after extensive validation with experimental data. The present work focused on validating computation...

J. Fluids Eng. / Volume 131 / Issue 11 / Research Papers / Multiphase Flows

Cavitation Inception in the Wake of a Jet-Driven Body

J. Fluids Eng. -- November 2009 -- Volume 131, Issue 11, 111302 (8 pages)
doi:10.1115/1.4000388

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ABSTRACT

REFERENCES (16)

Author(s):
Roger E. A. Arndt
University of Minnesota, 2 Third Avenue SE, Minneapolis, MN 55414

Eduard L. Amromin
Mechmath LLC, 14530 Bluebird Trail, Prior Lake, MN 55372-1283

William Hambleton
University of Minnesota, 2 Third Avenue SE, Minneapolis, MN 55414

Althoughcavitation inception in jets has been studied extensively, little isknown about the more complex problem of a jet flowinteracting with an outer flow behind a moving body. Thisproblem is studied experimentally by considering inception behind an axisymmetricbody driven by a waterjet. Tests were carried out forvarious water tunnel velocities and jet speeds such that jetvelocity ratio U_J/U could be varied in the range of0–2. Distinctly different cavitation patterns were observed at zero jetvelocity (when cavitation appeared in spiral vortices in such flows)and at various jet velocity ratios (when cavitation appeared aroundthe jet in such flows). A simple superposition analysis, utilizingparticle imaging velocimetry (PIV) measurements, is able to qualitatively predictthe experimental result. On the basis of these observations, anumerical prediction of cavitation inception number based on viscous-inviscid interactionconcept is suggested.