Abstract
Abstract. This paper presents an experimental study on the performance of a micro-mixer using AC elec-tro-osmotic flow. The microchannel is made of PDMS for the side and top walls and glass patterned withITO for the bottom wall. We first investigated the effect of the applied potential as well as the frequencyon the slip velocity. We have found that the slip velocity is roughly proportional to the applied voltagein line with the Helmholtz-Smoluchowski equation and there is an optimum frequency at which the slipvelocity becomes maximized. To find the optimum parameters for mixing device we tested our devicefor various design parameters. It turned out that the best mixing effect is obtained approximately whenthe electrode angle is 30 o , electrode width 200µm, and the frequency of power supply 700 Hz. Key Words: AC Electro-osmosis flow(교류전기삼투 유동), Flow visualization(유동가시화 ), Mixing index(혼합지수 ), Optimum design(최적설계) 1. Introduction Lab-on-chips receive increasing attention in view oftheir possibility of practical applications in broad areassuch as biology and chemistry. Lab-on-chips arecomposed of micro-size mechanical and electricalsystems which enable pumping, mixing, separation,sequencing, reaction and even cell growth.Characterized by very low Reynolds numbers, thesystem encounters difficulty in mixing of fluids. Inorder to enhance mixing, various ideas have beenproposed in the literature. Cha et al.
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