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마이크로 노즐 내부 표면개질을 통한 유동제어의 실험적 연구
변도영(Doyoung Byun),김지훈(Jihoon Kim),엄성환(Seonghwan Eom),한규일(Kyuil Han),고한서(Hanseo Ko) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Recently, the research of microfluidics has been widely studied by many researchers, because the microfluidics system has been used in several fields such as lab-on-a-chip in medicine, colloid thruster in aerospace, microhydrodynamic in engineering, etc. The hydrophobic and hydrophilic internal surfaces are very important property to optimally design the microfluidic system. However, until now, no investigation is performed experimentally and theoretically to understand the flow instability and change of meniscus shape depending on the surface affinity in the microchannel. In this study, we visualized experimentally the flow characteristics in the microchannel whose surface is divided into hydrophilic and hydrophobic regions sequencially. For the hydrophilic and hydrophobic surfaces arrangement, when the meniscus reaches the interface region, the meniscus shape changes from concave to convex and the velocity near the centre increases.