亚临界水中超声激励空化泡动力学分析  

Dynamic analyses on cavitation bubbles driven by ultrasound in subcritical water

作　　者：杨日福[1] 赵超[1] 丘泰球[2] 

机构地区：[1]华南理工大学理学院,广州510640 [2]华南理工大学轻工与食品学院,广州510640

出　　处：《应用声学》2012年第3期184-189,共6页Journal of Applied Acoustics

基　　金：广东省教育部产学研项目(2011B090400272);国家自然科学基金(20776047)

摘　　要：考察亚临界水中压力和温度对超声空化泡动力学的影响。应用非线性Rayleigh-Plesset方程模拟空化泡运动过程,并利用Matlab软件编程求数值解,用碘量法测定超声在亚临界水中的声空化产额。结果表明:当亚临界水的压力<PA时,瞬态空化可以发生,空化泡运动过程中的最大半径总是随着亚临界水的压力的增大而减少。亚临界水温度不会影响空化的难易程度,但空化泡运动过程中的最大半径随着温度的增大而增大,与常态水对比,亚临界水产生瞬态空化所需要的声压振幅较高,但对于空化泡最大半径相同的瞬态空化需要的时间较短。The effects of pressure and temperature in subcritical water for ultrasonic cavitation dynamics are investigated. The motion of bubble is simulated using the Rayleigh-Plesset equation and solved using the Matlab software. Ultrasonic cavitation generated in subcritical water is measured using the iodometric method.The results show that when the pressure of subcritical water is smaller than the amplitude of ultrasound, transient cavitation can occur, the maximum radius of cavitation bubble always reduces along with the increasing pressure, the temperature of subcritical water does not affect the exhibition of cavitation, but the maximum radius of cavitation bubble always reduces along with increasing temperature. Compared with normal water, the amplitude of ultrasound required to produce transient cavitation in subcritical water is higher than that of normal water. However, transient cavitation requires a shorter time to reach the same maximum radius of cavitation bubble.

关 键 词：亚临界水 超声 空化泡 R-P方程 

分 类 号：TB566[交通运输工程—水声工程] O427.4[理学—物理]