The variation of the relative intensity of cavitation with temperature

Abstract

The variation of the relative intensity of cavitation with temperature has teen determined ty the chlorine liberation anderosion methods. Cavitation ability determined by the erosion method has been studied over a temperature range of 20º to 80º C and for an ultrasonic irradiation period of 40.0 (^+)- 0.04 minutes, using lead plates as samples. Studies of the free radical formation ability of cavitation over the same temperature range and for an irradiation time of 120.0 (^+)- 0.1 seconds are described. Factors such as the standardization of solutions, evaporation of solution, the preparation of lead sangles and their effects on the experimental results are accounted for. The endeavour has been to conduct these experimental assessments of cavitation ability under identical conditions of transducer frequency, power input to the transducer, height of test samples over the transducer face, etc and to obtain mathematical expressions in respect of the two activities of cavitation. A comparison of the results with previous experimental observations and their suitability as industrial methods of assessing ultrasonic cleaning effectiveness have been discussed. The possibility of measuring the relative intensity of cavitation and determining industrial ultrasonic cleaning efficiency with a piezoelectric crystalline probe is suggested. An electronic generator with a variable power out-put of 2 kw, capable of driving a magnetostrictive transducer unit at a frequency of 20 kc/s and used in the experimental work is also described.