Accession Number : AD0666012

Title :   SOME EFFECTS OF MACROMOLECULES ON CAVITATION INCEPTION AND NOISE,

Corporate Author : CALIFORNIA INST OF TECH PASADENA DIV OF ENGINEERING AND APPLIED SCIENCE

Personal Author(s) : Ellis,Albert T.

Report Date : JUN 1967

Pagination or Media Count : 24

Abstract : The investigation was of an exploratory nature and was undertaken to determine whether dilute solutions of macromolecules in water had any effect on flow generated cavitation inception and noise. The results reveal a definite inhibition of cavitation inception on a one-quarter inch diameter model with a hemispherical nose at flow velocities of forty to fifty feet per second. This effect was quite marked and at concentrations of fifty parts per million by weight polyethylene oxide reduced the cavitation parameter at inception by almost a factor of two. Noise from the cavitation as received from a transducer within the model appeared to decay in intensity soon after cavitation was established. This was not observed with water alone. Quantitative measurements of this effect were not attempted. A discussion of a possible mechanism for cavitation inhibition is given. (Author)

Descriptors :   (*CAVITATION, INHIBITION), (*LUBRICANTS, POLYMERS), CAVITATION NOISE, SOLUTIONS(MIXTURES), ETHYLENE OXIDE, HYDRODYNAMIC CONFIGURATIONS, INTENSITY, WATER TUNNELS, EPOXY RESINS, DEGRADATION

Subject Categories : Lubricants and Hydraulic Fluids
      Acoustics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE