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Impulsive forces of two spark-generated cavity bubbles with phase differences
Ultrasonics Sonochemistry ( IF 8.4 ) Pub Date : 2022-05-18 , DOI: 10.1016/j.ultsonch.2022.106042
Rho-Taek Jung 1 , Nyo Me Thet Naing 2
Affiliation  

The characteristics of synchronous and phase difference bubble pairs in axisymmetric configuration near a boundary are investigated experimentally by the spark discharge method. Their destructive forces on nearby boundaries are measured using a polyvinylidene fluoride sensor. The bubble pair interactions and deformed features in the boundary vicinity are dissimilar to those in bulk water. Moreover, significant discrepancies between in-phase and out-of-phase pair interactions and their intensities of impulses are also witnessed. The interbubble distance (η), stand-off distance from the boundary (γ), and phase offset (τ) are crucial parameters affecting the shape evolutions and impulsive forces. From the qualitative analysis of sensor acquisition and high-speed imaging, it is observed that bubble periods are either prolonged or shorter than their corresponding isolated single cavity according to different parameters and arrangements. Additionally, the strongest impingements are produced by in-phase pairs. The impulses of phase difference bubble pairs are remarkably lower than in-phase pairs and even lower than a single bubble in some arrangements.



中文翻译:

两个具有相位差的火花产生的空腔气泡的冲击力

采用火花放电法实验研究了边界附近轴对称结构中的同步和相位差气泡对的特性。使用聚偏二氟乙烯传感器测量它们对附近边界的破坏力。边界附近的气泡对相互作用和变形特征与散装水中的不同。此外,还见证了同相和异相对相互作用及其脉冲强度之间的显着差异。气泡间距离 ( η )、与边界的距离 ( γ ) 和相位偏移 ( τ) 是影响形状演变和冲力的关键参数。从传感器采集和高速成像的定性分析可以看出,根据不同的参数和排列方式,气泡周期比其相应的孤立单腔长或短。此外,最强的撞击是由同相对产生的。相位差气泡对的冲量明显低于同相对,在某些排列中甚至低于单个气泡。

更新日期:2022-05-20
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