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Extensive tests have shown that the temperatures of ultrasonically activated solvents are important in achieving maximum cleanability. The temperatures used for the liquid stage in industrial applications are often too low to support cavitation. When the temperature of the solvents reaches well-defined ranges, the dramatic increase in the power of cavitation results in correspondingly better cleaning. The critical temperature varies according to the particular solvent used.
Comparisons were made under the following conditions: (1) still bath, (2) mechanically agitated bath, and (3) sonic-agitated bath. Temperatures ranged from ambient temperature to the boiling points of the solvents used. Cavitation power levels were determined at the various temperatures by physical means. The results were correlated with cleaning results obtained on a variety of contaminants common to industry; these cleanability tests were evaluated by visual, physical, and radiometric techniques.
Smallwood, J. E.
Senior Project Engineer, Pioneer-Central Division, Bendix Corp., Davenport, Iowa.