• CN：11-2187/TH
• ISSN：0577-6686

• 交叉与前沿 •

### 双层桨搅拌槽内层流流场与混合时间的数值模拟

1. 1.燕山大学里仁学院 秦皇岛 066004
2.燕山大学机械工程学院 秦皇岛 066004；
• 出版日期:2015-08-20 发布日期:2015-08-20
• 基金资助:
河北省自然科学基金(E2005000333)和秦皇岛市科学技术研究与发展计划(201302A010)资助项目

### Numerical Simulation of the Laminar Flow Field and Mixing Time in Stirred Tank with Double Layer Impeller

LIANG Yingna1,2, GAO Dianrong2, BAI Liang2

1. 1.Liren College, Yanshan University, Qinhuangdao 066004
2.College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004
• Online:2015-08-20 Published:2015-08-20

Abstract: The laminar model, the multiple reference frame(MRF) and the tracer concentration method are employed to simulate the laminar flow field and the mixing time of highly viscous non-Newtonian fluid in stirred tank with double layer straight impeller. The flow field characteristics, the spreading process of tracer, the responding curves of tracer concentration and the mixing time are analyzed. The tracer particles and the acid-base indicator method are used to measure the flow field and the mixing process in a transparent plexiglass stirred tank in experiment. The results show that the tracer is flowing and diffusing with main medium first in the feeding half of stirred tank because of the intermediate surface between double paddle, then diffusing to the other half when the concentration difference has increased. The shorter mixing time is obtained when feeding tracer at the blade-closed-area which stirred vigorously or at the intermediate surface. Different time are used to complete mixing at different points, so choosing reasonable monitor points with mixing require could avoid resource wasting or insufficient stirring. The mixing process of the medium in stirred tank is faster and the mixing time is shorter when increasing stirring speed. The accuracy of the numerical simulation results is verified by the experimental results. The research provides the theory basis for the design and engineering application of the laminar flow stirred tank with non-Newtonian fluid.