DESIGN OF AN ELECTROOSMOTIC MICROMIXER USING CFD
A numerical computational model of electroosmotic micromixer is developed using a CFD software package, and numerical simulations are executed to verify its accuracy. This rectangular microchannel mixer utilizes heterogeneous surface potential to form recirculation flow and enhance mixing in channel. The basic ζ potential of channel walls is -25mV, and the modulated potentials are +200mV and -200mV, respectively. Several ζ potential modulation modes are studied to optimize the ζ potential modulation, which pattern different modulated ζpotential regions on the top and bottom channel surfaces to produce in-plane vortex. Single-plane (top or bottom) and double-plane (top and bottom) drive vortex are investigated to show their characteristics and influences upon the mixing process. According to the simulation results, a reference entry length indicates that the ratio of entry length to channel width must be greater than one to eliminate the corner effectcompletely. Mixing process of two kind of modulation arrangements are also compared with the aim of a more effective mixing. In the end an electroosmotic mixer is designed and simulated numerically, which works under a 50000V/m electric field and can get a flowrate about 0.5nL/m with mix length less than one centimeter.
Xiaozhang Wang Zhuangde Jiang Chaohui Wang
Institute of Precision Engineering, Xi’an Jiaotong University, Xi’an, China 710049;State Key Laboratory for Manufacture Systems Engineering, Xi’an, China 710049
国际会议
海南三亚
英文
2007-01-10（万方平台首次上网日期，不代表论文的发表时间）