泡群內(nèi)氣泡振動特性分析
[Abstract]:In this paper, the effects of the amplitude of driving sound pressure, the frequency of acoustic waves and the liquid environment on the vibration characteristics of cavitation bubbles are analyzed based on the nonlinear vibration equation of bubbles in a uniform spherical bubble group. The numerical results show that there is an unstable response region in the nonlinear vibration bubble driven by ultrasonic wave. The unsteady response region is mainly distributed in the low frequency region with acoustic frequency less than 50 kHz and the microbubble size with a balance radius of less than 10 渭 m. The cavitation microbubbles with a balance radius of about 3 渭 m have strong acoustic response ability and instability. In a specific liquid and acoustic environment, they are easily disturbed to grow into bubbles with a larger equilibrium radius, and the sound waves are driven by a constant frequency of sound waves. With the increase of the pressure of driving sound wave, the nonlinear resonance frequency of the bubble decreases, the resonance size of the bubble decreases in the sound field, and the cavitation threshold of the bubble with large equilibrium radius is low, which is more likely to cause cavitation effect. The concentration of dissolved gas in liquid affects the cavitation process and the threshold of cavitation sound pressure, and the lower the concentration of dissolved gas is, the higher the cavitation threshold is.
【作者單位】: 陜西師范大學(xué)超聲學(xué)重點實驗室;
【基金】:國家自然科學(xué)基金(編號:11204168,11474191) 中央高;究蒲袠I(yè)務(wù)費專項資金(編號:Gk201603102)資助項目
【分類號】:O35
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