Spatio-temporal dynamics of an encapsulated gas bubble in an ultrasound field
Spatio-temporal dynamics of an encapsulated gas bubble in an ultrasound field
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DOI：
10.1121/1.2215228
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发表时间：
2006-08-01
影响因子：
2.4
通讯作者：
Dayton, Paul A.
中科院分区：
文献类型：
--
作者：
Doinikov, Alexander A.;Dayton, Paul A.
利用拉格朗日公式推导了超声场中封装气泡的径向和平移动力学耦合方程。这些方程推广了Church的理论[J]。Acoust。Soc。通过考虑气泡的平移运动和由于周围液体的可压缩性而造成的辐射损失，[m. 97, 1510 (1995)]在假设气泡壳可以是任意厚度且不透气的情况下，对Church给出的气泡内半径对应于气泡壳非应变状态的表达式也进行了改进。根据丘奇的理论，对径向方程进行了比较线性分析。结果表明，与丘奇理论的预测有很大的出入。该模型应用于计算包封气泡所受的辐射力及其平移位移。结果表明，在较高的频率范围内，包封气泡比同等大小的自由气泡具有更高的转译效率。(c) 2006年美国声学学会。
Coupled equations describing the radial and translational dynamics of an encapsulated gas bubble in an ultrasound field are derived by using the Lagrangian formalism. The equations generalize Church's theory [J. Acoust. Soc. Am. 97, 1510 (1995)] by allowing for the translation motion of the bubble and radiation losses due to the compressibility of the surrounding liquid. The expression given by Church for the inner bubble radius corresponding to the unstrained state of the bubble shell is also refined, assuming that the shell can be of arbitrary thickness and impermeable to gas. Comparative linear analysis of the radial equation is carried out relative to Church's theory. It is shown that there are substantial departures from predictions of Church's theory. The proposed model is applied to evaluate radiation forces exerted on encapsulated bubbles and their translational displacements. It is shown that in the range of relatively high frequencies encapsulated bubbles are able to translate more efficiently than free bubbles of the equivalent size. (c) 2006 Acoustical Society of America.