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원관 내부의 Vane Swirlers에 의해 발생되는 압력 강하와 난류 소산에 관한 수치해석
신태석(Shin Taeseok),김현구(Kim Hyungoo),김상우(Kim Sangwoo),이도형(Lee Dohyung) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
The computational study of turbulent dissipation and total pressure drop behavior in vane swirlers was investigated. Simulation of steady flow through vane swirlers for various vane angles ranging from 15° to 60° in an increasing step of 15° Flow has been simulated by solving the appropriate governing equations of conservation of mass and momentum using the SIMPLE algorithm. Turbulence has been modeled using Reynolds Stress Model (RSM). First of all, this model includes the effect of the flow parameters, and assumes that the total pressure drop consists of two main partial pressure drops due to wall friction within the vane swirler and swirling motion of the air. Futhermore, assumes that the effect of the turbulent dissipation consists of Reynolds number and Swirl flow. The pattern of vortex dissipation is quite different from that variable vane angle.
LIF Conforcal Microscope을 이용한 Y-channel 마이크로믹서의 최적설계 연구
김상우(Sangwoo Kim),현석호(Seok-ho Hyun),신태석(Taeseok Shin),이도형(Dohyung Lee) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.5
Due to extremely small device size and velocity scale, mixing in microchannel take place very slowly by way of molecular diffusion transport. Mixing enhancement becomes a central issue in microfluidics for biomedical and chemical applications. In this work, The optimization results and validation through experiment and fabrication. In this efficient micromixer design, it is essential to evaluate mixing efficiency with good precision. Mixing efficiency for Y-channel micromixer is measured by fluorescence intensity using LIF(Laser Induced Fluorescence) Confocal Microscope. The Y-channel micromixers are fabricated with polydimethylsiloxane(PDMS). Nile Blue A is injected into the micromixer as a fluorescence dye for measuring of fluorescence intensity by He/Ne laser. Throughout the experiments and computer simulation, accurate mixing efficiency evaluation process for a PDMS Y-channel micromixer is established.