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Updated: Dec 24, 2025

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Published on: May 9, 2021
The history force on bubbles translational motion in an acoustic field
Junjie Jiao1, Yong He2, Peng You2
1Mechanical Engineering College of Nanjing University of Science and Technology, National Defense Laboratories of ZNDY, Jiangsu, China; Naval Equipment Research Institute, Beijing, China.
Abstract:
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.
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