| Citation: | GAO Guofu, LI Kang, LI Yu, et al. Formation mechanism of Faraday wave on thin liquid film excited by ultrasonic vibration[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(8): 1582-1588. doi: 10.13700/j.bh.1001-5965.2018.0710(in Chinese)
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Aimed at the Faraday wave formed by 35 kHz ultrasonic excitation on thin liquid film, the formation mechanism of Faraday wave was explored by experiments and finite element simulation. The two-phase flow calculation model under ultrasonic excitation was established. The finite element simulation of the formation process of Faraday wave was carried out by CFD method. The formation mechanism of Faraday wave was discussed by analyzing the phase diagram and streamline diagram. The vibration frequency of Faraday wave was about 1/2 of the drive frequency. The existence of liquid inertia resulted in a constantly varying phase difference between the ultrasonic excitation and the liquid surface wave, and the phase difference variation period was about two ultrasonic excitation periods. Through the 35 kHz ultrasonic excitation experiment on thin liquid film, a well-arranged Faraday wave array pattern was observed on the surface of the thin liquid film. By measuring the wavelength of the Faraday wave, it was deduced that the surface wave frequency obtained by the experiment was about 1/2 of the ultrasonic frequency, and consistent with the results of finite element simulation.
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