镁合金熔体中超声空化泡行为的数值模拟

以超声空化理论为基础,应用Matlab软件对Rayleigh-Plesset方程进行了数值模拟计算,主要研究了不同超声条件(超声频率、声压幅值和空化泡初始平衡半径)对镁合金熔体中空化泡行为的影响,并且探讨了声压幅值和熔体主体温度对空化泡崩溃时的泡内温度和压力的影响.结果表明,较低的超声频率和熔体主体温度、较高的声压幅值以及小于或等于共振尺寸的空化泡初始平衡半径有利于超声空化效应.

Numerical Simulation of Ultrasound-Induced Cavitation Bubbling Behavior in Magnesium Alloy Melt

Based on the theoretical studies on the ultrasound-induced cavitation, a numerical simulation to solve the Rayleigh-Plesset equation with Matlab was done to investigate the influence of different ultrasonic conditions including ultrasonic frequency, acoustic pressure and initial radius of cavitation bubble on the cavitation bubbling behavior in magnesium alloy melt. In addition, the effects of melt bulk temperature and acoustic pressure on the maximum temperature/pressure in collapsing bubble were also discussed. The results showed that what will benefit the ultrasound-induced caviatation are the lower ultrasonic frequency, melt bulk temperature and higher acoustic pressure, as well as the initial radius of cavitation bubble, which is equal to or less than the size that will cause resonance.