二维变形方波微混合器混合效果  

Mixing Effect of Two-Dimensional Micromixers Based on the Deformed Square-Wave

作　　者：张芹[1] 游炜臻[2] 林耿锐[2] 

机构地区：[1]集美大学生物工程学院,福建厦门361021 [2]厦门大学化学化工学院,福建厦门361005

出　　处：《微纳电子技术》2010年第10期624-628,共5页Micronanoelectronic Technology

基　　金：国家基础科学人才培养基金资助项目(J0630429);福建省自然科学基金计划项目(D0740013);集美大学科研基金资助项目(ZQ2007001)

摘　　要：设计并制作了多种二维变形方波微混合器,通过荧光观测及标准偏差数值分析,在低Re数(Re≤13.33)时,考察拐角和单元长度对混合器混合效果的影响。结果表明,集成拐角的混合器存在一个临界Re值1.3,当Re<1.3时,混合基于分子扩散,拐角大小对混合效率无影响,混合效率保持在28%左右;当Re>1.3时,可以产生回流,混合效率随着拐角的减小逐渐提高。对于集成6个单元、拐角为45°、单元长度(s)为3132μm的微混合器,在雷诺系数Re=13.33时,混合效率为56%,约提高了1倍;但当拐角与混合单元长度增大时,混合效率明显降低。A series of two-dimensional micromixers based on the deformed square-wave were designed and fabricated.The effect of the turning angle and unit length on the mixing efficiency at low Reynolds number（Re≤13.33）was investigated by fluorescence observation and numerical analysis of the standard deviation from the pixel intensity distribution.The results indicate that the mixer with the integrated turning angle has a critical Reynolds value of 1.3.The mixture only depends on the molecular diffusion and the mixing efficiencies remained at about 28% when Re1.3 regardless of the turning angle;the mixing efficiencies increase gradually with the decrease of turning angle due to the recirculation generation when Re1.3.For the micromixer of six square-wave units with 45° turning angle and 3 132 μm unit length,the mixing efficiency is increased to 56% at Re=13.33.However,the mixing efficiency is decreased with turning angle and unit length increasing.

关 键 词：微流控芯片 微流体 混合 微混合器 变形方波微混合器 

分 类 号：Q503[生物学—生物化学] O357[理学—流体力学]