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미세유체시스템의 유체이송을 위한 탄성체의 복원력을 이용한 흡입형 미세유체펌프
변강일(Kang Il Byun),한의돈(Eui Don Han),김병희(Byeong Hee Kim),서영호(Young Ho Seo) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.1
This paper presents a disposable passive suction pump that uses the restoring force of an elastomeric chamber for liquid transportation in a microfluidic system. The proposed suction pump can be operated by finger pressure without any peripheral equipment. To adjust the generated suction pressure, five different displacements of the suction chamber ceiling, two different chamber shapes, and five different elastic moduli of the elastomer were considered. For a cylindrical chamber with a 5 mm height and 5 ㎜ radius, the generated suction pressure and flow rate increased almost linearly up to about 31 ㎪ and 160.8 μL/min, respectively, depending on the chamber deformation. A maximum suction pressure of 42.9±0.7 ㎪ was obtained for a hemispherical chamber with a 2.1 ㎜ height and 5 ㎜ radius.
나선형 미세채널 내부에 형성되는 딘와류 이용한 미세입자 분리소자
변강일(Kang Il Byun),김형진(Hyung Jin Kim),김병희(Byeong Hee Kim),서영호(Young Ho Seo) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.6
This paper presents a microparticle separator using a spiral microchannel. A particle separator based on the dean vortex was designed, fabricated, and characterized. Two different spiral microchannels were fabricated. Width and initial radius of rotation in the spiral microchannel were fixed to 300 μm and 1.75 mm, respectively. Two different depths of the microchannels were designed at 50 μm and 80 μm. In this experimental study, the equilibrium position of microparticles was monitored by using fluorescent microbeads. In the case of a low dean number (<1.0), lift force and dean drag force were similar, indicating that microbeads were distributed to almost all areas across microchannels. However, in the case of a high dean number (>1.0), dean drag force rather than lift force was dominant, indicating that microbeads moved toward the inner wall of the spiral microchannel.