速度流型对微混合器混合效果的影响

微流控芯片是“芯片实验室”发展的重点,微混合器是微流控芯片的重要作用形式,在微尺寸下获得高效混合是重要的研究方向．采用Fluent软件对T型管两液流混合过程进行了数值模拟,对三种典型速度流型,即抛物线型、塞状型和凹面型速度流型条件下的混合效果进行了比较分析、数值模拟和理论分析表明：流速以及流型对混合效果具有很大的影响,抛物线型的混合效果最好;利用泵驱动系统比电渗驱动系统更有利于混合．

Influence of Flow Velocity Profile on Mixing Effect in Micromixer

Microfluidic chip is the developing emphasis of " Lab on a chip" . Micromixer plays an important role in microfluidic chip. How to achieve high mixing efficiency under micro dimension is an important research topic. The paper presents numerical simulation of mixing process of two liquid flows in typical T-shaped channel on microfluidic chip with Fluent software. The mixing effects for three flow velocity profiles, parabola, plug-like and concave, are compared. The results show that flow rate and velocity profile act greatly on mixing efficiency. The parabola profile is the best one. The results also show that pump driven system is better than electroosmoti-cally driven system.