低雷诺数微尺度蜿蜒通道黏弹性流体快速混合

Micro Flow of Viscoelastic Fluids in Serpentine Channels at Low Re

充分混合是微流控中诸多实验的前提。然而目前在微尺度下实现短距离充分混合仍困难且不经济。具有显著黏弹性的低浓度聚合物溶液被认为是低雷诺数下增强混合的有效方式。该项研究工作中,我们通过采用正交注入的方法,提出了一种十分有效的微混合器。通过可视化和统计学分析,半定量表征了混合性能,分析了其中与弹性不稳定相关的流动学解释,实现了微尺度短距有效混合增强。

Effective mixing is extremely critical to microfluidics. However, it is still difficult and uneconomical to achieve effective mixing within a short mixing length at micro scale. Viscoelastic polymer solutions with low polymer concentrations are considered to be a positive approach to enhance mixing efficiency at low Reynolds numbers. This work proposed a micro-mixer based on the orthogonal injection. The flow visualization and statistical analysis is conducted quantitatively.Additionally, the flow mechanism associated with elastic instability has been interpreted. Finally,effective mixing within a short mixing length is achieved.