Ultrasonic Cavitation Threshold Measurements in an Anechoic Tank
Abstract
Acoustic cavitation was induced in an anechoic tank at frequencies of 31.8 and 41.3 kHz. The electrical resistance, reactance and impedance of a tonpilz transducer was measured at various transducer voltages before and after cavitation. The appearance of gas and vapor bubbles on the face of the transducer during cavitation was indicated by large changes in measurements made on the input side of the transducer. The projector was linear over the entire transducer voltage range covered. The spectrum of the first five harmonics was measured. The appearance of the second harmonic proved to be the most sensitive means of detecting the onset of cavitation. The following appeared after cavitation inception: (1) The third, fourth, and fifth harmonic, (2) The subharmonics, and (3) The wide-band noise.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 27, 1968
- Accession Number
- AD0675949
Entities
People
- E. V. Shalis
Organizations
- Pennsylvania State University