Based on the cavitation in the melt generated by ultrasound , the mechanism by which the tiny insoluble particles were activated and became active solidification nuclei was discussed , and fine grains were obtained 基于超声波对熔体产生的空化效应，讨论了熔体中微粒超声活化成为结晶核心，促进形核和细化晶粒的作用机制。
Choicing suitable configuration , ventilation installation and controlling the unevenness of flow surface at the sudden enlargement section after the tainter gate , this emptying tunnel may avoid or mitigate cavitation 在工作闸门区突扩跌坎处，选择合适的体型及通气设施并严格控制表面不平整度，可达到防止或减小空化的目的。
This paper summarizes the functional mechanism of ultrasonic cavitation , and introduces the application of ultrasonic wave technology in aspects of the extraction process , emulsification and demulsification , membrane , polymer synthesis 综述了超声空化的作用机理,介绍了超声波技术在萃取过程、乳化与破乳、膜过程、聚合物合成方面的应用。
Through an investigation of cavitation of ultrasonic wave cleaning , the cause of cavitation noise and its effect factors are analysed , and some advices to reduce the influence of cavitation noise to environment are proposed 摘要通过对超声波清洗中空化现象的研究，分析了空化噪声产生的原因和影响因素，提出一些减小空化噪声对环境影响的方法。
However the cavitation effect induced by ultrasound may prematurely catalyze nucleation , which hinders the further achievement of bulk undercooling . the measured growth velocity of ice dendrite is 0 . 17m / s corresponding to the maximum undercooling of 24k 讨论了空化效应对水滴过冷度的影响，认为空化效应诱发水滴提前形核，抑制了大过冷度的获得。
In the first chapter , the background of sonoluminescence was introduced . it includes the introduction of the bubble dynamics , the mechanism of sl , the theory of sl and the potential applications of sl have been reviewed in the thesis 本文在第一章概述了声空化和声致发光研究的历史和进展，从两大类声致发光及其应用方面阐述了本研究工作的意义。
Through the analysis of current computer simulation technology and the study of software engerneering , the practical significance is put forward and a general stepis given for the development of the software of supercavitat ing simulation 通过对目前计算机仿真技术的跟踪分析和对软件工程的研究，提出了鱼雷超空化仿真程序开发的实际意义和一般步骤。
Study of the supercavitation is in the primary state in our country . and the area of experimental facilities concerning supercavitation is almost a blank . this is a big obstacle in the way of developing of supercavitation theory 我国对于超空化的研究目前处于起步阶段，超空化研究的专用试验设备基本是一片空白，这严重制约着超空泡理论的深入研究。
At same time , author suggests to change cavitation factor to important operation condition during pressure fluctuation test so to avoid producing the phenomenon of cavitation stimulus in the prototype operation 同时，建议针对水轮机的重要运行工况，增加不同空化系数下的压力脉动试验，以避免在真机运行时可能产生“空化自激”现象，确保原型机组的安全运行。
The aerated behaviours in cavitation region of high velocity flow through the non - circulating water tunnel are investigated by using the advanced experimental facilities in the hydraulics laboratory at zhejiang university of technology 摘要本文用先进的量测仪器在浙江工业大学水力学实验室直流式水洞中分别对高速水流空化区、空蚀区的掺气特性进行了较为系统的试验研究。
