Macroscopic acousto-mechanical analogy of a microbubble

作者：Chaline Jennifer^*; Jimenez Noe; Mehrem Ahmed; Bouakaz Ayache; Dos Santos Serge; Sanchez Morcillo Victor J

来源：Journal of the Acoustical Society of America, 2015, 138(6): 3600-3606.

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 5Hz 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.

• 出版日期2015-12