摘要
行星式搅拌装置适用于固体颗粒与高黏度聚合物熔体的混合,搅拌釜内高黏度流体的流动状况非常复杂,实验方法很难获得搅拌釜内流场细节。利用FLUENT软件数值模拟了新型行星式搅拌釜内高黏固液两相流的流场,分析了不同转速条件下搅拌釜不同截面的速度场和浓度场。计算中采用欧拉模型,使用动网格技术,利用FLUENT的用户自定义函数确定2个搅拌桨的速度。计算结果表明,搅拌釜内高黏度流体形成了全釜内的循环流动,提高转速可有效增大环流区域,缩小不良混合区域;搅拌釜内的组合桨形具有较好的搅拌混合效果;增加搅拌时间,可较大改善搅拌釜内固体颗粒浓度分布,整个釜内的浓度梯度减小。数值模拟结果对搅拌釜的优化设计和运行有一定的指导意义。
Planetary mixer is suitable for the mixing of solid particles and high viscosity polymer. The flow of the high viscosity fluid is very complicated in the mixer and the experimental method is hard to get the details of the flow field. The solid-liquid two-phase flow in the planetary mixer for high viscosity fluid was simulated by using FLUENT package. The velocity field and concentration field at different sections were analyzed for the different rotation speeds in this paper. The calculation was based on Eulerian Model, The dynamic mesh technique was used to regulate the motion of the mesh and the user-defined functions （UDFs） were used to specify the velocities of the impellers. The results showed that the circulatory flow of high viscosity fluid was formed in the mixer. The higher the rotation speed was, the bigger the circulation area was and the smaller the poor blending area was. The mixing effect for the combination impellers was well in the mixer. With the extension of the stirring time, the concentration distribution of the solid particles in the mixer was more evenly and the concentration gradient was reduced. The numerical results were of great significance for the optimum design of the mixer and its operation.
出处
《计算机与应用化学》
CAS
CSCD
北大核心
2011年第10期1249-1254,共6页
Computers and Applied Chemistry
关键词
行星式搅拌釜
欧拉模型
动网格
数值模拟
planetary mixer, Eulerian Model, Dynamic Mesh, numerical simulation
