Experimental Study on Acoustic Streaming in Water Containing Microcapsules
Experimental Study on Acoustic Streaming in Water Containing Microcapsules
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含水微胶囊中声流的实验研究
DOI：
10.1143/jjap.40.3861
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发表时间：
2001
影响因子：
1.5
通讯作者：
Yoshiaki Watanabe
中科院分区：
文献类型：
--
作者：
T. Okabe;S. Sakamoto;Yoshiaki Watanabe
微气泡对介质中的声场有很强的影响，并由此引起各种现象。特别是，在这项研究中，微气泡对声流在水中的影响进行了定量研究的实验方法。为了确保微泡随时间在水中的恒定分布，并了解微泡的量，制备含有一定量的包装在单元中的微胶囊的水。使用激光多普勒测速仪（LDV）测量流动速度。观测结果表明，由于微胶囊的存在，水中的声流速度增加，并且流体动力学非线性在高声压下影响有无微胶囊的速度。这种非线性在低声压下控制微胶囊的速度，并且还导致具有微胶囊的介质的流动速度与没有微胶囊的介质的流动速度之间的比率对声压的依赖性。
Microbubbles strongly affect the sound field in a medium and various phenomena are caused by this sound field. In particular, in this study, the influence of microbubbles on acoustic streaming in water is quantitatively investigated by an experimental method. In order to ensure a constant distribution of microbubbles in water with time, and to appreciate the quantity of the microbubbles, water containing a certain amount of microcapsules packed in a cell is prepared. The streaming velocities are measured using a laser Doppler velocimeter (LDV). The observed results evidently show that the acoustic streaming velocity in water increases due to the microcapsules, and fluid-dynamic nonlinearity affects both velocities with and without microcapsules at a high sound pressure. This nonlinearity controls the velocity with microcapsules at a low sound pressure and also causes the dependence of the ratio between the streaming velocities of the medium with microcapsules and that without microcapsules on the sound pressure.