Retrospect and Perspective of Micro-mixing Studies in Stirred Tanks  

搅拌槽内微观混合研究的回顾与展望(英文)

作　　者：程景才 冯鑫 程荡 杨超 

机构地区：[1]Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Chinese Academy of Sciences

出　　处：《Chinese Journal of Chemical Engineering》2012年第1期178-190,共13页中国化学工程学报（英文版）

基　　金：Supported by the State Key Development Program for Basic Research of China (2010CB630904);the National Natural Science Fund for Distinguished Young Scholars (21025627);the National Natural Science Foundation of China (21106154,20990224);the National High Technology Research and Development Program of China (2011AA060704);the Beijing Natural Science Foundation (2112038) and Jiangsu Province Project (BY2009133)

摘　　要：Mixing problems are most likely encountered and sometimes can be severe in scaling-up projects. Micro-mixing is an important aspect for fast or quasi-instantaneous reactions. Poor micro-mixing might produce more undesired by-products, leading to higher purification costs. This paper gives an extensive review and analysis of micro-mixing studies in single- and multi phase stirred tanks. The relevant experiment techniques, micro-mixing models and nurherical approaches are critically reviewed and analyzed with remarks and perspectives. The reported studies on two-phase micro-mixing experiments and on the impact of the presence of the dispersed phases on turbulence have been limited to a narrow range of conditions. More importantly, disparities widely exist among different reports. Both Lagrangian and Eulerian models are based on oversimplified assumptions, which may lead to uncertainties or even unrealistic results. A heuristic model, which is from the perspective of CFD （computational fluid dynamics） and can cover the whole spectrum of scales and also focus on every subrocess, is desired in the future.Mixing problems are most likely encountered and sometimes can be severe in scaling-up projects.Micro-mixing is an important aspect for fast or quasi-instantaneous reactions.Poor micro-mixing might produce more undesired by-products,leading to higher purification costs.This paper gives an extensive review and analysis of micro-mixing studies in single-and multiphase stirred tanks.The relevant experiment techniques,micro-mixing models and numerical approaches are critically reviewed and analyzed with remarks and perspectives.The reported studies on two-phase micro-mixing experiments and on the impact of the presence of the dispersed phases on turbu-lence have been limited to a narrow range of conditions.More importantly,disparities widely exist among different reports.Both Lagrangian and Eulerian models are based on oversimplified assumptions,which may lead to uncer-tainties or even unrealistic results.A heuristic model,which is from the perspective of CFD(computational fluid dynamics) and can cover the whole spectrum of scales and also focus on every sub-process,is desired in the future.

关 键 词：MICRO-MIXING MULTIPHASE micro-mixing model stirred tank computational fluid dynamics 

分 类 号：TQ027.2[化学工程]