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RESEARCH PAPERS

Effect of Nozzle Shape and Polymer Additives on Water Jet Appearance

[+] Author and Article Information
J. W. Hoyt

U. S. Naval Academy, Annapolis, Md.

J. J. Taylor

Naval Ocean Systems Center, San Diego, Calif. 92152

J. Fluids Eng 101(3), 304-308 (Sep 01, 1979) (5 pages) doi:10.1115/1.3448966 History: Received March 24, 1977; Online October 12, 2010

Abstract

The effects of shape parameters on the performance of water-jet nozzles discharging in air were investigated using a camera specially adapted for jet photography. The boundary-layer developing on the exit surface of the nozzle is shown to account for the jet appearance revealed by high speed photography. Optimum nozzles seem to have the boundary-layer transition to turbulence inside the nozzle; transition outside the nozzle being accompanied by spray formation and early jet disruption. The effect of polymer additives seems to be earlier transition and a thinner turbulent boundary layer inside the nozzle which improves jet performance.

Copyright © 1979 by ASME
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