材料特性对行星式离心混合器混合性能影响的数值研究  

Numerical study on influence of material characteristics on mixing performance of planetary centrifugal mixer

作　　者：王港 刘冲[1] 李旭东 娄建伟 李经民[1] WANG Gang;LIU Chong;LI Xu-dong;LOU Jian-wei;LI Jing-min(School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学机械工程学院,辽宁大连116024

出　　处：《机电工程》2022年第5期627-633,647,共8页Journal of Mechanical & Electrical Engineering

基　　金：国家重点研发计划资助项目(2020YFB2009002)。

摘　　要：针对行星式离心混合器(PCM)的使用中存在材料特性与混合性能之间关系难以确定的问题,采用计算流体动力学(CFD)模拟研究了流体黏度与密度对PCM混合性能的影响。首先,采用ICEM CFD对计算域进行了建模并划分了网格,对网格进行了无关性分析;然后,采用二阶有限体积法与离散相模型对PCM混合不同黏度与密度流体时的质点轨迹、低速区域以及离散粒子分布进行了求解,通过定义的混合指数对混合效果进行了定量表征;最后,分析了流体黏度与密度对PCM混合性能的影响机制。研究结果表明:流体黏度与密度主要通过影响流场结构使PCM的混合效果发生变化;流体黏度越大对应的最优转速比越大,能达到的最大混合指数值越小;流体密度越大对应的最优转速比越小,能达到的最大混合指数值越大;该研究结果可为PCM的使用与优化提供参考。Aiming at the problem that the relationship between material properties and mixing performance was difficult to determine in the use of planetary centrifugal mixer(PCM),the effects of fluid viscosity and density on the mixing performance of PCM were studied by computational fluid dynamics(CFD)simulation.Firstly,the computational domain was modeled and meshed by ICEM CFD,and the independence of the grid was analyzed.Then,the second order finite volume method and discrete phase model were used to solve the particle trajectories,low velocity regions and discrete particle distribution of PCM mixing fluids with different viscosity and density,and the mixing effect was quantitatively characterized by the mixing index defined.Finally,the influence mechanism of fluid viscosity and density on the mixing performance of PCM was analyzed.The results show that fluid viscosity and density change the mixing effect of PCM mainly by affecting the flow field structure.The growth of fluid viscosity contributes the increase of optical speed ratio and the smaller value of mixing index that can be achieved;the growth of fluid density contributes the decrease of optical speed ratio and the greater values of mixing index that can be achieved.The research provides references for the use and optimization of PCM.

关 键 词：行星式离心混合器 混合性能 材料特性 数值仿真 计算流体动力学 流体黏度 

分 类 号：TH69[机械工程—机械制造及自动化] TQ027.1[化学工程]