Influences of inter-bubble interactions on ultrasonic cavitation dynamics and subharmonic emissions in viscoelastic media with nonlinear elasticity

IF 9.7 1区 化学 Q1 ACOUSTICS
Dui Qin , Qianru Yang , Bingyu Zhang , Wei Wang , Xiaojuan Ji
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引用次数: 0

Abstract

Ultrasonic cavitation in viscoelastic media is a physical process that features in a variety of chemical reactions, food processing, and biomedical applications due to a range of cavitation-associated physical, chemical, and biological effects. The cavitation effects are essentially caused by the dynamic behaviors of oscillating bubbles, which are strongly influenced by the complex and various inter-bubble interactions. However, how cavitation bubbles interact with each other and these interactions subsequently influence the ultrasonic cavitation dynamics and acoustic emissions in viscoelastic materials still remain poorly understood. This research, by incorporating both the interactions between bubbles and the nonlinear elasticity of viscoelastic medium, first modeled and numerically investigated the dynamics of interacting cavitation bubbles in viscoelastic media with nonlinear elasticity. Then, how the inter-bubble interactions affect the bubble dynamic behaviors and subharmonic cavitation emissions was quantitatively examined. Results revealed that the oscillation amplitudes are influenced differently for the case of two-bubble systems, i.e., either the enhancement or suppression effects, which affect the cavitation bubbles of different sizes to various degrees. It was found that, in most cases, the cavitation bubble of larger sizes can exert more pronounced influences on the smaller one, potentially determining whether the smaller bubble can produce subharmonic emissions. Moreover, the subharmonic emission from each cavitation bubble can be newly generated or eliminated, as respectively compared to the non-interacting cases where the single bubble is unable or able to generate the subharmonics. These phenomena primarily result from the shifts and dampening effects observed in the subharmonic resonance peak of cavitation bubbles. Additionally, it demonstrated that an increase in the amplitude of ultrasound and a decrease in the distance between bubbles would intensify the interaction effects on the subharmonic resonance characteristics. Such enhanced interactions can alter the resonance behaviors as well as amplify the strength of the 1/2 order subharmonics manifested in the power spectra. These findings might provide new insights into the interaction effects on the ultrasonic cavitation dynamics and resultant subharmonic emissions.
非线性弹性粘弹性介质中气泡间相互作用对超声空化动力学和次谐波发射的影响
粘弹性介质中的超声空化是一种物理过程,由于与空化相关的一系列物理、化学和生物效应,在各种化学反应、食品加工和生物医学应用中都有体现。空化效应本质上是由振荡气泡的动态行为引起的,而振荡气泡的动态行为受气泡间复杂多样的相互作用的强烈影响。然而,对于空化气泡如何相互作用以及这些相互作用如何影响粘弹性材料中的超声空化动力学和声发射,人们仍然知之甚少。本研究结合粘弹性介质中气泡与非线性弹性的相互作用,首次对粘弹性介质中空化气泡与非线性弹性相互作用的动力学进行了模拟和数值研究。然后定量分析了气泡间相互作用对气泡动力学行为和次谐波空化发射的影响。结果表明,双泡系统的振荡幅度受到不同程度的影响,即增强效应或抑制效应,对不同尺寸的空化气泡有不同程度的影响。研究发现,在大多数情况下,较大尺寸的空化泡对较小的空化泡的影响更明显,这可能决定较小的空化泡是否能产生次谐波发射。此外,与单个空化泡不能或不能产生次谐波的非相互作用情况相比,每个空化泡的次谐波发射可以分别产生或消除。这些现象主要是由于空化气泡的次谐波共振峰发生了位移和阻尼效应。此外,超声振幅的增大和气泡间距的减小会加剧相互作用对亚谐波共振特性的影响。这种增强的相互作用可以改变共振行为,并放大功率谱中表现的1/2次谐波的强度。这些发现可能为相互作用对超声空化动力学和由此产生的次谐波发射的影响提供新的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Ultrasonics Sonochemistry
Ultrasonics Sonochemistry 化学-化学综合
CiteScore
15.80
自引率
11.90%
发文量
361
审稿时长
59 days
期刊介绍: Ultrasonics Sonochemistry stands as a premier international journal dedicated to the publication of high-quality research articles primarily focusing on chemical reactions and reactors induced by ultrasonic waves, known as sonochemistry. Beyond chemical reactions, the journal also welcomes contributions related to cavitation-induced events and processing, including sonoluminescence, and the transformation of materials on chemical, physical, and biological levels. Since its inception in 1994, Ultrasonics Sonochemistry has consistently maintained a top ranking in the "Acoustics" category, reflecting its esteemed reputation in the field. The journal publishes exceptional papers covering various areas of ultrasonics and sonochemistry. Its contributions are highly regarded by both academia and industry stakeholders, demonstrating its relevance and impact in advancing research and innovation.
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