基于分合式混合单元的微混合器设计与研究

为实现微尺度下流体的快速均匀混合,基于对流体的分割、合并实现流体间接触面积指数式增长的原理,提出了一种分合式(SAR)混合单元,通过仿真对其支路夹角进行了优化,并最终确定支路夹角θ=70°.利用成熟的标准SU-8光刻及PDMS制作工艺,制作了分合式与组合分合式两种微混合器.采用甘油-水按体积比5:95(0.000 97...

Design and study on micromixer based on splitting and recombination mixing unit

In order to realize quick and uniform mixing of micro scale,a splitting and recombination（SAR） mixing unit based on principle of fluid splitting and recombination was designed.Its branch angle θ was optimized by fluent and θ=70° was chosen as the optimized structure parameter.The SAR-micromixer and compound-SAR-micromixer（CSAR-micromixer） were fabricated by a standard photolithographic technique which is much easier than the fabrication of some 3D micromixer.SAR-micromixer,CSAR-micromixer and slant block micromixer（SBM） were tested under Re=0.052~20,using the mixture of glycerol and water with volumetric ratio 5 ∶ 95（0.000 97 Pa·s）.The test results show that,mixing length of SBM is larger than 20 mm when Re≥1.23,in contrast,maximum mixing of SAR-micromixer is only 7.6 mm and CSAR-micromixer which is the most efficient is about 5.4 mm.SAR-micromixer and CSAR-micromixer can be easily realized and integrated to microfluidic systems.