Shell Effects on Vibration Behavior of a Microcapsule in an Acoustic Field
Shell Effects on Vibration Behavior of a Microcapsule in an Acoustic Field
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壳对声场中微胶囊振动行为的影响
DOI：
10.1143/jjap.42.6700
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发表时间：
2003
影响因子：
1.5
通讯作者：
Yoshiaki Watanabe
中科院分区：
文献类型：
--
作者：
D. Koyama;N. Barbier;Yoshiaki Watanabe
讨论了声场中微胶囊的壳效应对微胶囊振动行为的影响。壳体弹性参数Sp用于壳体效应的定量评价。在这项工作中，一个单一的微胶囊在声驻波的行为进行了观察，使用高速摄像机。通过改变驱动声压，证实了微胶囊的振动模式对驱动声压的依赖性。测量了微胶囊的脉冲响应，发现微胶囊的共振频率高于无壳的自由气泡。应用修正的RPNNP方程对实验结果和计算结果进行了比较，并估算了微胶囊的壳弹性参数Sp。
The shell effects on the vibration behavior of a microcapsule in an acoustic field are discussed. Shell elasticity parameter Sp is applied to the quantitative evaluation of the shell effects. In this work, the behaviors of a single microcapsule in an acoustic standing wave are observed using a high-speed video camera. By changing the driving-sound pressure, the dependence of the vibration mode of a microcapsule on the driving-sound pressure is confirmed. Measurements of impulse response of the microcapsules are also carried out, and then it is found that microcapsules have higher resonant frequencies than free bubbles which do not have a shell. A comparison between the experimental and calculated results is carried out by applying the modified RPNNP equation, and the shell elasticity parameter Sp of a microcapsule is estimated.