超音波によるキャビテーションの力学(第I報) : 基礎方程式 (<特集>超音波)

概要

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(1) In order to facilitate the mathematical treatment, the formal cavitation determinable by the magnitude of the amplitude of vibrating-bubble was considered besides the practical cavitation detectable by its marked, chemical and mechanical effects. (2) According to the experimental results on the ultrasonic degradation of polymer in solution, cavitation intensity is almost independent of the ultrasonic intensity. One of causes for this fact may be ascribed to the fact that the cavitation intensity is weakened by the damping effect of gas in a vibrating bubble. (3) In order to examine the influence of gas-damping on cavitation intensity, the authors considered the behavior of gas as follows: During the expansion stage of cavitation, the dissolved gas in liquid comes into the cavity, while the free gas in the bubble goes out of the bubble during its contraction. Based on such consideration, fundamental simultaneous equations were derived, as shown in this paper. (4) As the usage of suspensions of powder materials is considered as the conventional method for detecting the directions of the stream-lines, it is stressed in this paper that in like manner polymer solution could become an useful means for determining the dynamical force of fluid flow.
社団法人日本音響学会の論文
1957-03-30