Effects of ultrasound intensification on micro-mixing performance in a confined impinging reactor

被引：0

作者：

Du Q. ^{[1
]}

Chen L. ^{[1
]}

Zeng H. ^{[1
]}

Chen B. ^{[1
]}

机构：

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

来源：

Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2023年 / 37卷 / 05期

关键词：

impinging flow; micro-mixing; segregation index; ultrasonic enhancement;

D O I：

10.3969/j.issn.1003-9015.2023.05.006

中图分类号：

学科分类号：

摘要：

In order to enhance the crystallization performance of nanoparticles in a confined-impinging jet reactor, an ultrasonic field was introduced to enhance the hydrodynamics and micro-mixing process in the "triangle zone" just above the impinging region in the reactor. The Villermaux-Dushman parallel competing reaction system was used to experimentally study the effects of ultrasound intensification on the micro-mixing performance in the confined-impinging jet reactor. The segregation index, micro-mixing time and Damkohler number Da were employed to characterize the micro-mixing performance of the impinging flow. The results show that low-frequency ultrasonic field can significantly enhance the micro-mixing process by inducing the ultrasonic acoustic cavitation in the reactor, especially when the Reynolds number is low. It is found that compared with the case without ultrasound, the segregation index is reduced by 10.9% to 23.5% under ultrasound irradiation. The micro-mixing time is also decreased from 0.000 16-0.000 43 s to 0.000 14-0.000 33 s with ultrasound. It is also observed that Da number of the reactor is always smaller than 1, which indicates the chemical kinetics is dominated by the micro-mixing process. © 2023 Zhejiang University. All rights reserved.

引用

页码：740 / 748

页数：8

共 28 条

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