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Micromachines 2017, 8(4), 119; doi:10.3390/mi8040119

Fluid Flow and Mixing Induced by AC Continuous Electrowetting of Liquid Metal Droplet

1
School of Mechatronics Engineering, Harbin Institute of Technology, West Da-zhi Street 92, Harbin 150001, Heilongjiang, China
2
School of Mechatronics Engineering, Qiqihar University, Wenhua Street 42, Qiqihar 161006, Heilongjiang, China
3
State Key Laboratory of Robotics and System, Harbin Institute of Technology, West Da-zhi Street 92, Harbin 150001, Heilongjiang, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Shizhi Qian and Xiangchun Xuan
Received: 11 March 2017 / Revised: 27 March 2017 / Accepted: 6 April 2017 / Published: 9 April 2017
(This article belongs to the Special Issue Micro/Nano-Chip Electrokinetics, Volume II)
View Full-Text   |   Download PDF [2478 KB, uploaded 9 April 2017]   |  

Abstract

In this work, we proposed a novel design of a microfluidic mixer utilizing the amplified Marangoni chaotic advection induced by alternating current (AC) continuous electrowetting of a metal droplet situated in electrolyte solution, due to the linear and quadratic voltage-dependence of flow velocity at small or large voltages, respectively. Unlike previous researchers exploiting the unidirectional surface stress with direct current (DC) bias at droplet/medium interface for pumping of electrolytes where the resulting flow rate is linearly proportional to the field intensity, dominance of another kind of dipolar flow pattern caused by local Marangoni stress at the drop surface in a sufficiently intense AC electric field is demonstrated by both theoretical analysis and experimental observation, which exhibits a quadratic growth trend as a function of the applied voltage. The dipolar shear stress merely appears at larger voltages and greatly enhances the mixing performance by inducing chaotic advection between the neighboring laminar flow. The mixer design developed herein, on the basis of amplified Marangoni chaotic advection around a liquid metal droplet at larger AC voltages, has great potential for chemical reaction and microelectromechanical systems (MEMS) actuator applications because of generating high-throughput and excellent mixing performance at the same time. View Full-Text
Keywords: mixer; Marangoni chaotic advection; continuous electrowetting; liquid metal droplet mixer; Marangoni chaotic advection; continuous electrowetting; liquid metal droplet
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hu, Q.; Ren, Y.; Liu, W.; Chen, X.; Tao, Y.; Jiang, H. Fluid Flow and Mixing Induced by AC Continuous Electrowetting of Liquid Metal Droplet. Micromachines 2017, 8, 119.

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