Abstract
Cavitation damage tests in high-water-base-fluids (HWBF) are carried out with an ultrasonic vibratory cavitation test apparatus, and cavitation noise spectra are measured. The results are compared with those for other fire resistant fluids (water-glycol fluid and phosphate ester), petroleum oil, and water. The mass loss in HWBF is about one-half of that in water, which is triple or quadruple of that in the water-glycol fluid, and several decuple in phosphate ester. For the tested liquids, the mass loss in petroleum oil was the lowest. Sound pressure levels in the frequency domain 40 kHz in HWBF are lower, compared with that in water. The values of SPL and mass loss in 0.3% HWBF are smaller than those in 5% and 20% HWBF and water. Harmonic resonance and subharmonic components in noise spectra detected in the water-glycol fluid, phosphate ester and petroleum oil may be caused by nonlinear oscillation of bubbles induced by pressure variation with resonant frequency.
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