Measurement of acoustic power in studying cavitation processes
| Autor: | I. M. Margulis, M. A. Margulis |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Acoustical Physics. 51:695-704 |
| ISSN: | 1562-6865 1063-7710 |
| DOI: | 10.1134/1.2130901 |
| Popis: | A comparative calorimetric method for measuring the acoustic power generated by a sound source under cavitation conditions and the power absorbed by a liquid with bubbles is developed. The conditions under which the whole of the generated power is absorbed by the liquid with bubbles are determined experimentally. An instrument for power calibration of sound sources operating under cavitation conditions is designed. The instrument is found to provide a high measurement accuracy (3% or better). The requirements on the dimensions of the vessel and on the volume of the liquid in which the sound source operates are formulated to make the power generated under cavitation conditions independent of these parameters. For the first time, it is shown experimentally (by the example of the reaction of nitric oxide formation under the action of sound) that, if these conditions are satisfied and the sound intensity exceeds the threshold intensity, the rate of a number of sonochemical reactions is proportional to the sound intensity in the range from 1.7 to at least 47 W/cm2. It is shown that the dependence of the rate of cavitation processes on the sound intensity with a maximum at 8.6 W/cm2 and a sharp decrease in the rate with a further intensity increase is determined by the fact that the measured quantity was the electric power at the transducer rather than the acoustic one. |
| Databáze: | OpenAIRE |
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