Abstract
Cavitation erosion tests were undertaken in distilled water using stationary copper specimens in close proximity to the free end of the horn of an ultrasonic vibrator running at 20 kHz with a peak-to-peak amplitude of 2 mil. Reduction of the gas content from 18.4 to 7.5 mll −1 resulted in a decrease in the maximum erosion rate from 4.35 to 0.73 mil h −1 with a corresponding increase in the characteristic time from approximately 15 min to 2.5 h. An increase in bulk temperature of the test liquid from 17 to 75 °C indicated that at the lower temperatures, i.e. below 50 °C, the erosion rate was not particularly sensitive to temperature. Taking into account the temperature within the film itself a maximum erosion rate occurred at about 35 °C. Also presented are the results of tests using copper vibratory specimens for gas content and temperature conditions similar to those used for stationary specimens.
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