Chaline Jennifer, Jiménez Noé, Mehrem Ahmed, Bouakaz Ayache, Dos Santos Serge, Sánchez-Morcillo Víctor J
UMR Inserm U930, Université François-Rabelais, 10 boulevard Tonnellé, 37032 Tours, France.
Instituto de Investigación para la Gestión Integrada de Zonas Costeras, Universitat Politècnica de València, Paranimf 1, 46730 Grao de Gandia, Spain.
J Acoust Soc Am. 2015 Dec;138(6):3600-6. doi: 10.1121/1.4936949.
Microbubbles, either in the form of free gas bubbles surrounded by a fluid or encapsulated bubbles used currently as contrast agents for medical echography, exhibit complex dynamics under specific acoustic excitations. Nonetheless, considering their micron size and the complexity of their interaction phenomenon with ultrasound waves, expensive and complex experiments and/or simulations are required for their analysis. The behavior of a microbubble along its equator can be linked to a system of coupled oscillators. In this study, the oscillatory behavior of a microbubble has been investigated through an acousto-mechanical analogy based on a ring-shaped chain of coupled pendula. Observation of parametric vibration modes of the pendula ring excited at frequencies between 1 and 5 Hz is presented. Simulations have been carried out and show mode mixing phenomena. The relevance of the analogy between a microbubble and the macroscopic acousto-mechanical setup is discussed and suggested as an alternative way to investigate the complexity of microbubble dynamics.
微泡，无论是以被流体包围的游离气泡形式，还是目前用作医学超声造影剂的封装气泡形式，在特定的声学激励下都呈现出复杂的动力学特性。然而，考虑到它们的微米尺寸以及它们与超声波相互作用现象的复杂性，对其进行分析需要昂贵且复杂的实验和/或模拟。微泡沿其赤道的行为可以与一个耦合振荡器系统相关联。在本研究中，通过基于耦合摆环形链的声 - 机械类比，研究了微泡的振荡行为。展示了在1至5赫兹频率下激发的摆环的参数振动模式的观测结果。已经进行了模拟并显示出模式混合现象。讨论了微泡与宏观声 - 机械装置之间类比的相关性，并建议将其作为研究微泡动力学复杂性的一种替代方法。
