论文标题
涂层和未涂层气泡的非线性振荡中波能耗散机制的分类
Classification of the mechanisms of wave energy dissipation in the nonlinear oscillations of coated and uncoated bubbles
论文作者
论文摘要
当声波通过气泡介质时，它们会消散。气泡的耗散是通过热阻尼（TD），辐射阻尼（RD）和阻尼发生的，这是由于液体的摩擦（LD）和涂层的摩擦（CD）引起的。在非线性气泡振荡过程中，了解TD，RD，LD和CD的贡献的知识将有助于通过最大化所需参数来优化相关应用的气泡和超声曝光参数。在这项工作中，我们研究了气泡振荡中耗散的机制及其对各种非线性制度中总阻尼（Wtotal）的贡献。通过使用分叉分析，我们已经对气泡的非线性动力学进行了分类，这些动力学的第3个超级谐波（SUH）和第二个SUH共振频率（FR），压力依赖性共振频率（PDFR），FR，subharmonic（subharmonic（SH）共振（FSH = 2FR），压力依赖性SH RESONANCE SH RESONANCE（pDFSH）和1/1/1/1/1/1/1/1/1/1/1/1/1/使用分析图计算了相应的TD，RD，LD，CD，WTOTAL，散射与耗散比（STDR），最大壁速度和最大的反向散射压力，这些压力是通过分布图计算出来自气泡的非破坏性振荡的。我们对不同的耗散制度进行了分类，并提供了可以增强感兴趣的特定参数（例如RD）的参数区域。之后，增强的气泡活动与超声中的某些相关应用有关。本文代表了非线性振荡制度和相应阻尼机制的首次综合分析。
Acoustic waves are dissipated when they pass through bubbly media. Dissipation by bubbles takes place through thermal damping (Td), radiation damping (Rd) and damping due to the friction of the liquid (Ld) and friction of the coating (Cd). Knowledge of the contributions of the Td, Rd, Ld and Cd during nonlinear bubble oscillations will help in optimizing bubble and ultrasound exposure parameters for the relevant applications by maximizing a desirable parameter. In this work we investigate the mechanisms of dissipation in bubble oscillations and their contribution to the total damping (Wtotal) in various nonlinear regimes. By using bifurcation analysis, we have classified nonlinear dynamics of bubbles that are sonicated with their 3rd superharmonic (SuH) and 2nd SuH resonance frequency (fr), pressure dependent resonance frequency (PDfr), fr, subharmonic (SH) resonance (fsh=2fr), pressure dependent SH resonance (PDfsh) and 1/3 order SH resonance. The corresponding Td, Rd, Ld, Cd, Wtotal, scattering to dissipation ratio (STDR), maximum wall velocity and maximum back-scattered pressure from non-destructive oscillations of bubbles were calculated and analyzed using the bifurcation diagrams. We classified different regimes of dissipation and provided parameter regions in which a particular parameter of interest (e.g. Rd) can be enhanced. Afterwards enhanced bubble activity is linked to some relevant applications in ultrasound. This paper represents the first comprehensive analysis of the nonlinear oscillations regimes and the corresponding damping mechanisms.
