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Published June 1, 1991 | public
Journal Article Open

A Cavitation Susceptibility Meter with Optical Cavitation Monitoring -- Part Two: Experimental Apparatus and Results


This work in concerned with the development and operation of a Cavitation Susceptibility Meter based on the use of a venturi tube for the measurement of the active cavitation nuclei concentration in water samples as a function of the applied tension. The pressure at the venturi throat is determined from the upstream pressure and the local flow velocity without corrections for viscous effects because the flow possesses a laminar potential core in all operational conditions. The detection of cavitation and the measurement of the flow velocity are carried out optically by means of a Laser Doppler Velocimeter. A custom-made electronic Signal Processor is used for real time data generation and temporary storage and a computerized system for final data acquisition and reduction. The implementation of the whole system is described and the results of the application of the Cavitation Susceptibility Meter to the measurement of the water quality of tap water samples are presented and critically discussed with reference to the current state of knowledge on cavitation inception.

Additional Information

Contributed by the Fluids Engineering Division for publication in the Journal of Fluids Engineering. Manuscript received by the Fluids Engineering Division July 20,1989. This research has been fuuded by the Office of Naval Research, and by the Naval Sea Systems Command General Hydromechanics Research Program administered by the David W. Taylor Naval Ship Research and Development Center . The North Atlantic Treaty Organization-Consiglio Nazionale delle Ricerche, Italy, has also contributed to the support of this work through a 1982 and a 1983 Fellowship for Technological Research. Special thanks to Dr. T. T. Huang of PTNSRDC for his interest in this work, to Mr. Joe Fontana, Mr. Elton Daly, Mr. Rich Eastvedt, Mr. Leonard Montenegro, Mr. John Lee and to Miss Cecilia Lin of the Caltech staff for their assistance in the completion of the experiment and to Dr. Haskel Shapiro, Mr. Bob Kirkpatrick and their group for the design and implementation of the custom-made electronics.


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