SUN Yongchang, ZHANG Pei, WU Yukun, CHEN Wei, ZHENG Chenglin, XU Zhiheng, LI Zhengquan

（Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems,Jiangxi University of Science & Technology, Ganzhou 341000, China）

Abstract: In order to improve the mixing performance of the vertical stirred tank without baffles, the effects of particle size, density and friction coefficient between particles on the mixing performance of the stirred tank were studied by using the self-developed discrete element method software. The mixing degree of particles was evaluated by the contact number method and the mixing performance of particles was analyzed by combining the angular velocity of particles. The results show that the particle size has little effect on the mixing performance, and the mixing degree of the four particle combinations with different particle sizes is all between 0.25～0.45. The larger the density difference between the two kinds of particles, the smaller the mixing degree is. The mixing degree is the largest when the particle density is the same. The mixing degree increases firstly and then decreases with the increase of the friction coefficient between particles. When the friction coefficient reaches 0.54, the mixing degree is the highest, which is closed to 0.5.

Keywords: agitator; material parameter; mixing performance; numerical simulation; discrete element method

中图分类号： TF802.6                         文献标志码：A

收稿日期： 2022-03-04， 修回日期：2022-09-01，在线出版时间：2022-11-01。

基金项目：国家自然科学基金项目，编号：52130001； 江西理工大学高层次人才科研启动项目，编号：JXXJBS17078。

第一作者简介：孙永昌（1997—），男，硕士研究生，研究方向为颗粒模拟技术。E-mail： s19801266030@163.com。

通信作者简介：李政权（1982—），男，副教授，博士，硕士生导师，研究方向为多相流仿真模拟。E-mail： qqzhengquan@163.com。

文章编号：1008-5548（2022）06-0099-08

DOI:10.13732/j.issn.1008-5548.2022.06.011