Impulsive forces of two spark-generated cavity bubbles with phase differences

被引:6
作者
Jung, Rho-Taek [1 ]
Naing, Nyo Me Thet [2 ]
机构
[1] Univ Ulsan, Fdn Ind Cooperat, 93 Daehakro, Ulsan 44610, South Korea
[2] Univ Ulsan, Sch Naval Architecture & Ocean Engn, 93 Daehakro, Ulsan 44610, South Korea
关键词
Two-bubble interactions; Phase differences; Spark generation; PVDF; Impulsive forces; CAVITATION BUBBLES; PVDF FILM; COLLAPSE; DYNAMICS;
D O I
10.1016/j.ultsonch.2022.106042
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
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 (eta), stand-off distance from the boundary (gamma), and phase offset (tau) 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 inphase pairs and even lower than a single bubble in some arrangements.
引用
收藏
页数:12
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