A17 界面活性剤が音響キャビテーション・ノイズに与える影響

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Ashokkumar et al. [J. Am. Chem. Soc. 129, 2250 (2007)] reported that the intensity of the broad-band noise in acoustic cavitation noise from a low concentration surfactant (SDS) solution is much weaker than that from pure water. In the present study, numerical simulations of acoustic cavitation noise have been performed in order to study the mechanism of the much weaker broad-band noise from aqueous surfactant solution. The results of the numerical simulations have indicated that bubbles are shape stable in a low concentration aqueous surfactant solution due to smaller ambient radius of bubbles than that in pure water. It results in the much weaker broad-band noise because there is much less temporal fluctuation in the number of bubbles which is the origin of the broad-band noise. In other words, in a low concentration surfactant solution stable cavitation dominates, while in pure water transient cavitation dominates. Transient cavitation causes the temporal fluctuations in the number of bubbles resulting in the intense broad-band noise.
2009-10-23