CFD simulation of hydrodynamics and mixing performance in dual shaft eccentric mixers  

作　　者：Songsong Wang Xia Xiong Peiqiao Liu Qiongzhi Zhang Qian Zhang Changyuan Tao Yundong Wang Zuohua Liu 

机构地区：[1]School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China [2]State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing 400044,China [3]School of Mechanical and Transportation Engineering,Chongqing University,Chongqing 400044,China [4]Department of Chemical Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第10期297-309,共13页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(22078030,52021004);National Natural Science Foundation of Chongqing(2022NSCQ-LZX0271);Fundamental Research Funds for the Central Universities(2022CDJQY-005);National Key Research and Development Project(2019YFC1905802,2022YFC3901204);Key Project of Independent Research Project of State Key Laboratory of coal mine disaster dynamics and control(2011DA105287-zd201902).

摘　　要：This work aims to systematically study hydrodynamics and mixing characteristics of non-Newtonian fluid(carboxyl methyl cellulose,CMC)in dual shaft eccentric mixer.Fluid rheology was described by the power law rheological model.Computational fluid dynamics was employed to simulate the velocity field and shear rate inside the stirred tank.The influence mechanism of the rotational modes,height difference between impellers,impeller eccentricities,and impeller types on the flow field have been well investigated.We studied the performance of different dual-shaft eccentric mixers at the constant power input with its fluid velocity profiles,average shear strain rate,mixing time and mixing energy.The counter-rotation mode shows better mixing performance than co-rotation mode,and greater eccentricity can shorten mixing time on the basis of same stirred condition.To intensify the hydrodynamic interaction between impellers and enhance the overall mixing performance of the dual shaft eccentric mixers,it is critical to have a reasonable combination of impellers and an appropriate spatial position of impellers.

关 键 词：Dual shaft eccentric mixers Non-Newtonian fluid Mixing Laminar flow Computational fluid dynamics 

分 类 号：TB126[理学—工程力学]