YE Guangpeng1， LIU Zhenfeng2， ZHOU Guofa1
(1. School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China； 2. YichunWanshen Pharmaceutical Machinery Co., Ltd., Yichun 336000, China)
Abstract: A three-dimensional simulation model of continuous meshing counter-rotating twin-screw material mixer was established. The relative standard deviation of particle volume fraction at the outlet of mixer was used as the evaluation index of mixing uniformityand relationship between screw speed and the relative standard deviation was established. The mechanism of particle mixing process was expounded. The formula provides a theoretical basis for real-time detection, evaluation and control of powder mixing uniformity. The results show thatthe uniformity of mixed powder in mixing work zone increases as the distance from the inlet along the screw axis increases under different speed conditions. As the screw speed increases, relative standard deviation at the powder outlet decreasesand the variance of mixed powder residence time δ2 decreases. The uniformity of mixed powder at rectangular outlet increases as the screw speed increases. When screw speed is increased from 400 r/min to 800 r/min, relative standard deviation at outlet is reduced from 48.08% to 5.34%, relative standard deviation reduction is up to 89% and the uniformity of powder mixing is greatly improved. Relative standard deviation at the powder outlet tends to decrease as the mixing time increases. Increasing the mixing time is beneficial to improve the uniformity of powder mixing.
Keywords: twin screw; powder mixer;mixing uniformity; three-dimensional simulation; evaluation index; relative standard deviation
中图分类号：TQ469
文献标志码：A
文章编号：1008-5548(2021)04-0130-08
DOI:10.13732/j.issn.1008-5548.2021.04.016
收稿日期： 2020-08-20， 修回日期：2020-09-09，在线出版时间：2021-06-02 16:54。
基金项目：国家自然科学基金项目，编号：21464009。
第一作者简介：叶广朋(1994—)，男，硕士研究生，研究方向为绿色高效过程装备。E-mail：1105955783@qq.com。
通信作者简介：周国发(1962—)，男，博士，教授，博士生导师，研究方向为绿色高效过程装备。E-mail：ndzgf@163.com。
