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Stabilization and acoustic spectra of a cavitation cluster in an ultrasonic spherical cavity

机译：超声球形腔中空化团簇的稳定性和声谱

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摘要

The dynamics, stabilization, and acoustic spectra of a bubble cluster in different liquids are investigated under the condition of ultrasonic cavitation. Experimental data for the dynamics of a spherical ultrasonic cluster near the end face of a rod, capillary, or pressure sensor placed in the antinode of a pressure standing wave at the center of a single-wave spherical piezoelectric concentrator (piezoelectric sphere) are presented. The variation of the cluster size with the parameters of the ultrasonic field and properties of the liquid is studied. It is found that the shape, collapse dynamics, and stability of the cavitation cluster have a significant influence on the acoustocapillary effect. It is shown that the maximal acoustocapillary effect and sonoluminescence are observed when a stable cluster with spherically symmetric collapse dynamics is provided at the end of a capillary in a 50% solution of glycerol. Using a small-size piezotransducer placed at the center of the sphere, the acoustic pressure is measured and acoustic spectra are studied for different voltages across the piezosphere and during the formation of variously shaped cavitation clusters. In the case of fully developed cavitation and a spherical cluster, the acoustic spectra contain subharmonic components, the cavitation noise factor rises to 35%, and the maximum of the noise envelope shifts toward higher frequencies.
机译：在超声空化条件下研究了不同液体中气泡簇的动力学，稳定性和声谱。给出了位于棒，毛细管或压力传感器端面附近的球形超声簇的动力学实验数据，该棒，毛细管或压力传感器位于单波球形压电集中器（压电球）中心的压力驻波波腹中。研究了团簇尺寸随超声场参数和液体性质的变化。发现空化团簇的形状，塌陷动力学和稳定性对声-毛细血管效应有重要影响。结果表明，当在50％的甘油溶液中的毛细管末端提供具有球形对称塌陷动力学的稳定簇时，可以观察到最大的声囊毛细作用和声致发光。使用放置在球体中心的小型压电换能器，可以测量声压，并研究在整个压电层上以及形成各种形状的空化团簇期间不同电压的声谱。在完全形成的空化和球形簇的情况下，声谱包含次谐波分量，空化噪声因子上升到35％，并且噪声包络的最大值移向更高的频率。

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