Jiao Junjie, He Yong, You Peng, Shan Feng, Cui Donghua
Mechanical Engineering College of Nanjing University of Science and Technology, National Defense Laboratories of ZNDY, Jiangsu, China; Naval Equipment Research Institute, Beijing, China.
Mechanical Engineering College of Nanjing University of Science and Technology, National Defense Laboratories of ZNDY, Jiangsu, China.
Ultrason Sonochem. 2020 Sep;66:105113. doi: 10.1016/j.ultsonch.2020.105113. Epub 2020 Mar 30.
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 F/F 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.
在本研究中，使用配备高速摄像机的成像系统观察了22.4kHz超声驻波中气泡的平移轨迹。这使得在施加20kPa、40kPa和60kPa声压时能够测量气泡的速度，通过声学力和流体动力平衡模型间接测量历史力。结果表明，在低声压驱动下，历史力接近零，随着压力增加，历史力变大，F/F的比值从40kPa时的0.33变为60kPa时的1.73，当雷诺数较大时，该结果与先前的研究不同，这对于理解声场中的气泡运动很有帮助。
