The macroscopic change in the specific impedance of a liquid was analyzed from a microscopic viewpoint on the basis of bubble dynamics. A shift of the electrical characteristics of an ultrasonic vibration system, whose acoustical load includes a contribution from cavitating bubbles, was clarified analytically. Namely, when the bubbles begin to collapse, the real part of the specific impedance decreases gradually. On the other hand, the imaginary part rapidly becomes significant compared to the real part. Therefore, the liquid becomes a light acoustical load, and the amplitude of the electric admittance at the resonant increases rapidly. Moreover, the resonant frequency approaches that in a system without an acoustical load.
|ジャーナル||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|出版ステータス||Published - 2001 7月|
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