基于电渗流驱动的涡流诱导微混合器  

A Vortex-conducted Micromixer Dirven by Electroosmosis

作　　者：汪源[1] 王萍[1] 徐远清[2] 

机构地区：[1]天津工业大学电气工程及自动化学院,天津300160 [2]北京理工大学生命学院,北京100081

出　　处：《科技导报》2010年第11期86-90,共5页Science & Technology Review

基　　金：国家高技术研究发展计划(863计划)项目(2008AA12A218)

摘　　要：以电渗流为驱动,设计出一种采用涡流诱导增强混合的微米级混合器。通过控制混合方腔上下壁面电渗流的大小和方向,可诱导腔内流体产生不同的涡流形态,本文重点研究电渗流驱动下形成一个涡流和两个涡流时的混合特性,称相应涡流形态诱导混合下的模式为单涡模式和双涡模式,并采用数学模拟方法定量地研究了两种混合模式下典型的稳态特性和动态特性。研究结果表明:所设计的混合器具有流道短、结构简单,调控方便,可实现高效、连续和稳定的混合等特点;两种混合模式中,双涡诱导混合模式具有更好的应用价值。By taking electroosmosis as the driving force,a micrometer-range micromixer based on vortex-conducted is presented.In the design,a mixing quadrate antrum is placed to be a mixing container,in which the upside and underside wall is placed in a stable horizontal electric field,the electroosmosis flow is formed for the double electrical layers on the inner wall sides.The electroosmosis flow can drive its nearby fluid to move in a certain direction.However,the left and right sides of the mixing quadrate antrum are closed,and there is no electroosmosis taking place,so according to conservation of mass theory,some part of fluid will flow in a reverse direction contrastively to that of electroosmosis flow.By this means,some annular flow configuration are formed,that is,some shapes of vortexes can be created.Based on the above principle,two mixing modes of single-vortex mode and double-vortex mode are studied quantificationally with numerical simulation to discuss the performances of the mixer,especially of the stable and the dynamic mixing characteristic.It is proved with the numerical model that the proposed micromixer can perform high-efficiency,continuous and stable mixing,which has those advantages of short mixing channel,simple structure and convenient operation;as to the two mixing modes,the double-vortex mode is more significative in practical case.

关 键 词：电渗流 涡流诱导 微混合器 

分 类 号：O361.4[理学—流体力学]