• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2017, Vol. 53 ›› Issue (14): 202-208.doi: 10.3901/JME.2017.14.202

• 交叉与前沿 • 上一篇    下一篇

交流电热流场对微纳粒子介电泳行为的影响

闫姿姿1, 李姗姗1,2,3, 李铭浩1, 张明航1, 李铁军1,2, 戴士杰1,2   

  1. 1. 河北工业大学机械工程学院 天津 300130;
    2. 河北工业大学机器人及自动化研究所 天津 300130;
    3. 河北工业大学河北省智能传感与人机融合重点实验室 天津 300130
  • 收稿日期:2016-07-12 修回日期:2017-02-19 出版日期:2017-07-20 发布日期:2017-07-20
  • 通讯作者: 李姗姗(通信作者),女,1983年出生,博士,副教授。主要研究方向为微流控芯片技术、智能微机电系统。E-mail:lssharbin@gmail.com;戴士杰(通信作者),男,1970年出生,博士,教授,博士研究生导师。主要研究方向为机电一体化和机器人技术。E-mail:dshj70@163.com
  • 作者简介:闫姿姿,女,1987年出生。主要研究方向为微流控芯片技术。E-mail:fxyzzi@163.com
  • 基金资助:
    国家自然科学基金(51505123,51605136)、河北省自然科学基金(E2015202194)、河北省科技支撑计划(15271704)、中国博士后基金(2015M580190)和河北省青年拔尖人才计划(BJ2014014)资助项目。

Influence of AC Electrothermal Flow on the Dielctrophoretic Behaviors of Micro-nano Particles

YAN Zizi1, LI Shanshan1,2,3, LI Minghao1, ZHANG Minghang1, LI Tiejun1,2, DAI Shijie1,2   

  1. 1. School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130;
    2. Institute of Robot and Automation, Hebei University of Technology, Tianjin 300130;
    3. Key Laboratory of Intelligent Sensing and Human-Machine Integration in Hebei Province, Hebei University of Technology, Tianjin 300130
  • Received:2016-07-12 Revised:2017-02-19 Online:2017-07-20 Published:2017-07-20

摘要: 以叉指电极阵列为例,分别建立对称物理场、非对称物理场和行波物理场的有限元模型,求解三种情况物理场下微通道中的电场、流场、温度场和介电泳力的分布,分析交流电热流场的对流与传质过程对流场中微纳粒子介电泳的影响规律和干预方式。结果表明,对称物理场和非对称物理场内部均产生漩涡式扰动,增强了流场的对流与传质,可将处于介电泳有效作用范围之外的微纳粒子输送至电极附近区域,扩展了介电泳的实际有效作用区域。行波叉指电极阵列构建的流场则无明显漩涡,但行波物理场中介电泳力的衰减较慢,电极厚度60倍高度处衰减为10%,显著提高了对微纳粒子的操控和输送能力。

关键词: 对流与传质, 交流电热, 介电泳, 微流控

Abstract: Taking the case of interdigital electrode array, finite element models of symmetric/asymmetric physical field and travelling wave field are established respectively to solve the distribution of electric field, flow field, temperature and dielectrophoretic forces. The influence of AC electrothermal flow and the convective mass transfer process on the dielctrophoretic behaviors of micro-nano particles are presented herein. It is shown that the convection and mass transfer are enhanced due to the vortex generated by symmetric/asymmetric interdigital electrode array. As a result, the particles far away from the electrodes are transported towards the strong dielectrophoretic regions, enlarging the effective regions of dielectrophoresis. There is no obvious vortex and convections in the travelling wave flow field, but the dissipation of dielectrophoretic force is much slower than symmetric/asymmetric array, making the particles being trapped efficiently. The particles suspended at certain height (60 times of electrode height) can be affected by dielectrophoretic forces, improving the manipulating and transporting abilities for micro-nano particles.

Key words: AC electrothermal, convection and mass transfer, dielectrophoresis, microfluidics

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