The dynamics of a micrometer-sized bubble pair in water near a rigid boundary under standing ultrasonic wave excitation is investigated in this study. The viscous effect in the boundary layer at the air-water interface is considered following the viscous correction model. The evolution of the bubble surface at the collapsing stage of the bubble pair is presented for different parameter sets. The field pressure near the rigid boundary, which is induced by the oscillating bubble pair, and the high-speed water jet at the collapse stage, form the main focus of the analysis. This reveals that a horizontal configuration of the bubble pair retards the strength of the bubble jet towards the boundary, whilst a vertical configuration, especially with differently-sized bubbles, can enhance the bubble collapse. This study may help to understand the interaction of multiple bubbles in an acoustic field and its application to surface cleaning.

中文翻译：

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在超声驻波场中，刚性边界附近的空化气泡对的非线性动力学。

本研究研究了直立超声激发下刚性边界附近水中微米级气泡对的动力学。遵循粘性修正模型，考虑了空气-水界面边界层的粘性效应。针对不同的参数集，给出了气泡对破裂阶段气泡表面的演变。由振荡的气泡对引起的刚性边界附近的场压和塌陷阶段的高速水射流成为分析的重点。这表明，气泡对的水平构型阻碍了气泡射流向边界的强度，而垂直构型，尤其是具有不同尺寸的气泡，则可以增强气泡的破裂。