T型微混合器内液相混合的数值模拟  

Numerical simulation of liquid mixing in T-type micro-mixers

作　　者：齐文哲 郭凯[1,2] 赵明恩[1,2] 黄哲庆[1,2] 刘春江[1,2] 刘伯潭[1] 

机构地区：[1]天津大学化工学院化学工程联合国家重点实验室,天津300072 [2]天津化学化工协同创新中心(天津大学),天津300072

出　　处：《化学工程》2015年第3期64-69,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(21176171);国家重点基础研究发展计划(973计划)(2012CB720500);天津市自然科学基金重点项目(12JCZDJC28700)

摘　　要：T型混合器是微尺度条件下探索传递现象的理想模型,通过CFD方法对其内部流体力学性能及混合特征进行研究分析。首先,通过对不同Re数下T型微反应器内混合状态的模拟及分析,验证该方法对T型结构混合的可靠性;其次,通过对T型微反应器内流动形态的分析,发现涡结构的产生能够强化混合过程,并提出一种能产生强化混合的涡结构的新型T型反应器的设计理念;最后,对影响新型混合器的不同结构参数进行模拟并分析,得到该设计理念下的最优结构,并对该结构进行进一步分析,发现该结构能够扭曲混合界面以增大接触面积,从而强化混合效果。Three-dimensional numerical simulation was performed to study the flow dynamics and mixing characteristics of liquids inside T-type micro-mixers, which is the ideal model for investigating the transport phenomena in micro-system. The effect of flow pattern on mixing efficiency in micro-system was studied using computational fluid dynamics （CFD） method. Firstly, the reliability of CFD method was verified via simulating and analyzing the mixing characteristics in T-type micro-mixers of various Re number. Secondly, the simulation results indicate that the development of vortices is essential to achieving a good mixing performance. Thereibrc, a new concept for designing T-type micro-mixers that can generate vortices enhancing mixing effect was proposed. Finally, an optimal construct of T-type micro-mixers acquired via analyzing the effects of different geometrical parameters of mixers was further discussed. The simulation results indicate that the new mixer can achieve interface distortion that enhances the mixing performance because of enlarging contact surface in low Re number flow pattern.

关 键 词：T型微混合器 液相混合强化 计算流体力学 混合效率 涡结构 

分 类 号：TQ027.1[化学工程]