Accession Number : AD0636431

Title :   AN INVESTIGATION OF THERMODYNAMIC EFFECTS ON CAVITATION IN WATER FROM 80 DEGREES F TO 180 DEGREES F ON HEMISPHERICAL-NOSED BODIES.

Descriptive Note : Technical memo.

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB

Personal Author(s) : Seidel,G. S. , Jr

Report Date : 02 JUN 1966

Pagination or Media Count : 170

Abstract : The effects of variations in temperature on desinent and developed cavitation were investigated theoretically and experimentally. The experimental portion of the investigation was carried out with hemispherical nosed models of 1/4-inch and 1/2-inch diameters in the NASA ultra-high speed cavitation tunnel. Velocities were varied from 44 to 130 feet per second and temperatures were varied from 80F to 180F. Cavitation numbers were found to increase with velocity and temperature for desinent cavitation. For developed cavity flows, the cavitation numbers were found to increase or remain constant with increasing temperature. For developed cavity flow, both increases and decreases in cavitation numbers with velocity were observed. A theoretical method of predicting cavitation numbers was developed from the quasi-static approach used previously in pump applications. The theory was applied to desinent and to developed cavitation. Thermodynamic effects in desinent cavitation were found to be important only at the lowest velocity and highest temperature investigated. In developed cavity flows, it was found that in addition to thermodynamic effects, gas effects may be important. (Author)

Descriptors :   (*THERMODYNAMICS, *CAVITATION), WATER TUNNELS, FLUID MECHANICS, HEMISPHERICAL SHELLS

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE