主动式交变电场电渗微混合通道数值模拟

发布时间：2018-01-14 14:04

本文关键词：主动式交变电场电渗微混合通道数值模拟　出处：《微纳电子技术》2014年12期 　论文类型：期刊论文

【摘要】：为了获得快速、充分的流体混合效果,提出了一种主动式增强微通道内流体混合的方法。利用交变电场电渗,在微通道内诱发混沌流,以提高流体混合效率。基于有限元方法采用COMSOL软件对流体混合过程进行数值仿真,分析了相邻电极极性相同和相反时的混合效率及电场强度、电场频率对混合效率的影响。结果表明,此方法能够有效提高微通道内流体的混合效率。选择适当的电场强度和电场频率对提高混合效率有显著的影响。当相邻电极极性相反时,可获得更好的混合效果。定量地评价了该微混合通道的混合效果,即微通道出口处混合效率在0.5 s后较稳定地保持在99%,与无交变电场的电渗相比,混合效率提高了约46%。
[Abstract]:In order to obtain fast and sufficient fluid mixing effect, an active enhancement method of fluid mixing in microchannels is proposed. Chaotic flow is induced in microchannels by alternating electric field electroosmosis. In order to improve the efficiency of fluid mixing, the mixing efficiency and electric field intensity of adjacent electrodes were analyzed by COMSOL software based on finite element method. The effect of electric field frequency on mixing efficiency. This method can effectively improve the mixing efficiency of the fluid in the microchannel. The selection of appropriate electric field intensity and frequency has a significant effect on the mixing efficiency. The mixing effect of the microchannel was evaluated quantitatively, that is, the mixing efficiency at the exit of the microchannel remained stable at 99m after 0.5 s, compared with the electroosmosis without alternating electric field. Mixing efficiency has increased by about 46.
【作者单位】：青海大学机械工程学院;南昌大学机电工程学院;
【基金】：国家自然科学基金资助项目(51165031);国家自然科学基金重点项目(50730007)
【分类号】：O441.4
【正文快照】： 587Micronanoelectronic Technology Vol.51 No.12 December20140引言微流体系统通过微加工技术将微通道、微泵、微阀和微混合器等微流控元件集成在数平方厘米的芯片上[1],实现在微尺度下对微量流体的控制、操作和检测。两种或多种流体能否在微通道中快速、充分混合往往直接影

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