Combination and simultaneous resonances of gas bubbles oscillating in liquids under dual-frequency acoustic excitation.
The multi-frequency acoustic excitation has been employed to enhance the effects of oscillating bubbles in sonochemistry for many years. In the present paper, nonlinear dynamic oscillations of bubble under dual-frequency acoustic excitation are numerically investigated within a broad range of parameters. By investigating the power spectra and the response curves of oscillating bubbles, two unique features of bubble oscillations under dual-frequency excitation (termed as "combination resonance" and "simultaneous resonance") are revealed and discussed. Specifically, the amplitudes of the combination resonances are quantitatively compared with those of other traditional resonances (e.g. main resonances, harmonics). The influences of several paramount parameters (e.g., the bubble radius, the acoustic pressure amplitude, the energy allocation between two component waves) on nonlinear bubble oscillations are demonstrated.
College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China; School of Engineering, University of Warwick, Coventry CV4 7AL, UK.
Yuning
Y
Zhang
Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing 102206, China; School of Power, Energy and Mechanical Engineering, North China Electric Power University, Beijing 102206, China. Electronic address: y.zhang@ncepu.edu.cn.
Yuning
Y
Zhang
School of Engineering, University of Warwick, Coventry CV4 7AL, UK.
Shengcai
S
Li
Bubble dynamics; Bubble oscillations; Cavitation; Combination resonance; Dual-frequency; Simultaneous resonance