ZHOU Shuaishuai^1a,1b,1d,LI Jing^1a,YANG Hao^1b,QIAO Congzhen^1d,LU Chunxi²,ZHANG Jingwei^1a，1c

(1a.National &Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterial;1b.College of Chemistry and Chemical Engineering;1c.Collaborative Innnovation Center of Nano Functional Materials and Applications of Henan Province; 1d.Catalytic Reaction Research Center of Henan Province，Henan University,Kaifeng 475000,China; 2.Department of Chemical Engineering and Environment,China University of Petroleum (Beijing),Beijing 102249,China)

Abstract:The methods of experiment and simulation were used to reveal characteristcis of multi-phase complex flow field inside the stirred tank reactor,which was the key unit in graphere production by using liquied-phase method.Volume of fluent model of two-phase was used to predict the multi-phase flow field in the stirred tank,and suitability the model was verified by experimental results.Computational fluid dynamics-discrete element modeling coupling method was used to calculate the movement characteristics of the non-spherical particles in the stirred tank.The results show that the shear rate is much higher in the region near the edge of blades and the reactor wall,the particles are mainly concentrated in the region near the reactor wall at the bottom of the reactor,and the phenomenon of particle accumulation is formed at the bottom.The single particle trajectory shows that the main flow of non-spherical particles is along the streamline,and is affected by the accumulation of particles at the bottom.The particles will stay in the accumulation area for a long time during the movement.The forces exerted on the single particles show that the particles will be subjected to a larger pulse force due to the collision of the blades and the reactor wall during the movement,and the resultant force lasts for a short time,which is the main force for the change of the particle trajectory.

Keywords:liquid phase method;graphene；stirred tank reactor；non-spherical particle;computational fluid dynamics;discrete element modeling

中图分类号：TQ027                              文献标志码：A

文章编号：1008-5548(2022)02-0087-12

DOI:10.13732/j.issn.1008-5548.2022.02.011

收稿日期： 2021-10-06，修回日期：2021-10-19，在线出版时间：2022-02-17。

基金项目：NSFC-联合基金项目，编号：U2004176；河南省自然科学基金项目，编号：202300410063。

第一作者简介：周帅帅(1989—)，男，讲师，博士，研究方向为过程强化。E-mail：10150173@vip.henu.edu.cn。

通信作者简介：

卢春喜(1963—)，男，教授，博士，博士生导师，研究方向为过程强化。E-mail：lcx725@sina.com；

张经纬(1975—)，男，教授，博士，博士生导师，研究方向为纳米材料工程。E-mail：jwzhang@henu.edu.cn。