Effects of Ultrasonic Cavitation Micro Jet-flow on Impact Fine Particle Breakage Near Rigid Walls

被引：3

作者：

Sun Y. ^{[1
]}

Huang S. ^{[1
]}

Mao Y. ^{[1
]}

Zhu L. ^{[1
]}

机构：

[1] College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou

来源：

Zhongguo Jixie Gongcheng/China Mechanical Engineering | 2019年 / 30卷 / 24期

关键词：

Fine particle breakage; Micro jet-flow; Near rigid wall; Scanning electron microscope(SEM) image; Ultrasonic cavitation;

D O I：

10.3969/j.issn.1004-132X.2019.24.008

中图分类号：

学科分类号：

摘要：

In order to solve the problems of fine particles agglomeration which caused the minimum limit size by grinding, taking advantages of the effect of ultrasonic dispersion and cavitation in the fluid phase, the influences of ultrasonic cavitation micro jet-flow near the rigid walls on crush fine particles were conducted. The effective breakage distance between the cavitation bubble and the rigid wall was calculated, when a fine particle was impacted by the micro jet-flow. The effect of frequency, ultrasonic pressure, and media ball size on micro jet-flow velocity were discussed and ten kinds of tests under different conditions were conducted herein. The SEM technique was used to characterize the powder morphology. The key parameters of the particle size distribution such as median particle diameter D50, 10% cumulative particle diameter D10 and specific surface area(SSA) were analyzed. The theoretical analysis is basically consistent with the experimental results. Results show that the breakage rate of fine particles below 800 mesh may reach 79.35% and production rate more than 10, 000 mesh may reach 12.84% after parameter optimization. The media ball area has a greater effect on the breakage rate than that of the power, media ball size, and the mass concentration. The effect of crushing fine particles may be effectively improved by optimizing the parameters of the ultrasonic cavitation micro-jet flow and by increasing the surface area of the media ball. © 2019, China Mechanical Engineering Magazine Office. All right reserved.

引用

页码：2953 / 2960

页数：7

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