The Collapse Intensity of Cavities and the Concentration of Free Hydroxyl Radical Released in Cavitation Flow  

作　　者：张晓冬 付勇 李志义 赵宗昌 

机构地区：[1]R＆D Institute of Fluid and Powder Engineering, Dalian University of Technology, Dalian 116012, China

出　　处：《Chinese Journal of Chemical Engineering》2008年第4期547-551,共5页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China （10472024）.

摘　　要：Enhancing the chemical reaction processes by means of the energy released in the collapse of micro bubbles or cavities in the cavitation flow is a new research area. In the previous work, a new approach of measuring concentration of free hydroxyl radicals induced in cavitation flow by using methylene blue as the indicator was developed and used to study concentration of free radical induced in Venturi cavitation flow under various experimental conditions. In the present research, the radial evolution of a cavity bubble and the corresponding collapse pressure in sonic cavitation field are obtained by solving three different bubble dynamics equations： Rayleigh equation, Rayleigh-Plesset equation and Gilmore equation. By comparing with the experimental data on the radial evolution of a cavity bubble in the literature, it is found that the predicted results by the Gilmore equation, which takes account of the compressibility of fluid in addition to the viscosity and interfacial tension, agree with the experimental ones better than those by other two equations. Moreover, the theoretically predicted collapse pressures are consistent with the concentration of the free hydroxyl radical induced in the experimental venture. Thus, the concentration of the liberated free hydroxyl radical not only influences the reaction rate but also is used as an available parameter for measuring collapse intensity of cavities.借助于在成穴流动在微水泡或洞的倒塌释放的精力提高化学反应过程是一个新研究区域。在以前的工作，当指示物被开发并且过去常学习在各种各样的试验性的条件下面在液体流动测量器成穴流动劝诱的自由激进分子的集中，测量免费氢氧根激进分子的集中的一条新途径由使用甲又蓝色在成穴流动导致了。在现在的研究，声音的成穴地里的一个洞水泡和相应倒塌压力的光线的进化被解决三个不同水泡动力学方程获得：瑞利方程， Rayleigh-Plesset 方程和 Gilmore 方程。由在文学在一个洞水泡的光线的进化上与试验性的数据作比较，这被发现由 Gilmore 方程的预言的结果，除了粘性和界面的紧张考虑液体的压缩的可能性，由另外的二个方程比那些更好同意试验性的。而且，理论上预言的倒塌压力与在试验性的冒险劝诱的免费氢氧根激进分子的集中一致。因此，解放免费氢氧根激进分子的集中不仅影响反应率而且作为一个可得到的参数被使用测量洞的倒塌紧张。

关 键 词：hydrodynamic cavitation collapse pressure numerical simulation free hydroxyl radical 

分 类 号：O6[理学—化学]