Electrokinetic fluid delivery techniques have many applications in biofluid transport systems. Among those, the electrothermal fluid transport technique is a highly effective method for fluids with high conductivities, in the order of 0.02- 1 S/m. The ACET phenomenon has been mainly reported in the literature for micropumping and micromixing applications using coplanar asymmetric electrode arrays at the bottom of a microchannel. Recently, a novel ACET micropump based on a multi-electrode array system was reported. In this micropump, multiple asymmetric electrode arrays located on different sidewalls of the microchannel were utilized. Following this work, we implemented the same concept for a micromixing mechanism. For the sake of simplicity, only two coplanar microelectrode pairs, on the top and bottom of a 2D micro chamber, were considered. By applying different species concentration at one corner of the chamber, mixing of the fluid can be characterized throughout the chamber area. Simulations were performed using COMSOL Multiphysics. The results showed that using opposed asymmetric microelectrode pairs can provide a 74% decrease in the mixing time compared to identical pairs. Also, a chamber which has two electrode pairs, can have a 67% decrease in mixing time compared to one which has only one pair.
Alinaghi Salari, Maryam Navi, and Colin Dalton, "Optimized AC electrothermal micromixing design for biofluid systems," Proc. SPIE 10061, Microfluidics, BioMEMS, and Medical Microsystems XV, 100610T (Presented at SPIE BiOS: January 30, 2017; Published: 28 February 2017); https://doi.org/10.1117/12.2253815.
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