In this study, the translational trajectory of bubble in an ultrasonic standing wave at 22.4 kHz was observed using an imaging system with a high-speed video camera. This allowed the velocities of bubble be measured when the acoustic pressure at 20 kPa, 40 kPa and 60 kPa, which applied to indirectly measured the history force by using the acoustic and hydrodynamic forces balance model. It shown that bubbles driven at low acoustic pressure, the history force close to zero, and with the pressure increase the history force change to large, the ratio of FH/FQS from 0.33 at 40 kPa to 1.73 at 60 kPa, the result is different with prior research when the Reynolds numbers is large, and useful in the understanding of bubble moments in an acoustic field.

中文翻译：

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历史力作用于声场中的气泡平移运动。

在这项研究中，使用带有高速摄像机的成像系统观察了22.4 kHz超声驻波中气泡的平移轨迹。当使用20kPa，40kPa和60kPa的声压时，这可以测量气泡的速度，这适用于通过使用声学和流体动力平衡模型间接测量历史力。结果表明，在低声压下驱动的气泡，历史力接近于零，并且随着压力的增加，历史力变化较大，FH / FQS的比值从40 kPa时的0.33变为60 kPa时的1.73，结果不同在雷诺数大时进行了先前的研究，对理解声场中的气泡矩很有用。