A model for large amplitude oscillations of coated bubbles accounting for buckling and rupture
A model for large amplitude oscillations of coated bubbles accounting for buckling and rupture
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DOI：
10.1121/1.2109427
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发表时间：
2005-12-01
影响因子：
2.4
通讯作者：
Lohse, D
中科院分区：
文献类型：
--
作者：
Marmottant, P;van der Meer, S;Lohse, D
我们提出了一个适用于超声造影剂气泡的模型，该模型考虑了气体微泡上脂质单层涂层的物理性质。有三个参数描述了壳体的特性：屈曲半径、壳体的可压缩性和破裂壳体的张力。该模型在大振幅振荡时呈现出原始的非线性行为，称为仅压缩，由脂单分子层的屈曲引起。这一预测得到了Brandaris128高速相机的实验记录的验证，该相机的运行速度为每秒数百万帧。通过该模型预测了老化的影响，即重复的声压脉冲对气泡的影响。它修正了以前用于涂层气泡动力学方程的壳弹性项中的一个缺陷。破裂由临界壳层张力模拟，超过该临界壳层张力，气体直接暴露在水中。(C)2005年美国声学学会。
We present a model applicable to ultrasound contrast agent bubbles that takes into account the physical properties of a lipid monolayer coating on a gas microbubble. Three parameters describe the properties of the shell: a buckling radius, the compressibility of the shell, and a break-up shell tension. The model presents an original non-linear behavior at large amplitude oscillations, termed compression-only, induced by the buckling of the lipid monolayer. This prediction is validated by experimental recordings with the high-speed camera Brandaris 128, operated at several millions of frames per second. The effect of aging, or the resultant of repeated acoustic pressure pulses on bubbles, is predicted by the model. It corrects a flaw in the shell elasticity term previously used in the dynamical equation for coated bubbles. The break-up is modeled by a critical shell tension above which gas is directly exposed to water. (c) 2005 Acoustical Society of America.