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LIF 공초점 현미경을 이용한 장애물이 있는 Y-채널 마이크로믹서의 최적설계 평가
현석호(Seok-ho Hyun),이도형(Dohyung Lee),이성수(Seong-soo Lee),전재연(Jea-youn Jeon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Owing to the extremely small device and velocity scale, mixing in microchannel proceeds very slowly by way of molecular diffusion transport. Thus mixing enhancement becomes a central issue in microfluidics for biomedical and chemical applications. In this work, we evaluate the simulation result of optimization procedure through experiment and fabrication. In 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.
프레임워크를 이용한 연료공급 및 냉각계통 예비설계 프로그램 개발
최세영,박수용,현석호,최원,박정배 항공우주시스템공학회 2018 항공우주시스템공학회지 Vol.12 No.4
In this study, we propose a conceptual design tool to develop fuel supply and engine cooling systems for high-speed vehicles. The preliminary designing of the systems and their validation were performed using this tool. Improvement in the design tool program was made using the fluid–thermal system design framework, which was applied to ensure efficient data processing using combined modules. The model geometry and thermal environment values were entered into the program. The thermodynamic properties of the system components were computed using the design tool, and simulation was performed to check the satisfaction rate of the requirements. It is hypothesized that our proposed design tool would be suitable for designing components for use in fuel supply and engine cooling systems of high-speed vehicles. 고속 비행체의 연료공급 및 냉각계통의 통합설계를 위한 프로그램을 개발하고 이를 이용하여 예비설계 및 검증을 수행하였다. 개발된 설계 도구는 상용 열유체 시스템 설계 프로그램을 프레임워크로 이용하여 모듈 통합과 입출력 처리 등이 개선되었다. 모델의 형상 및 열환경 변수를 입력하여 구성품의 상태량을 계산하고 모사를 통하여 설계 요구조건 충족을 확인할 수 있다. 이 프로그램을 사용하여 시스템의 세부 구성품 규격 선정에 적절하게 사용할 수 있음을 나타내었다.
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.
고속비행체 연료 공급 및 냉각 시스템 설계를 위한 흡열연료의 열적 특성 연구
김민상(Minsang Kim),현석호(Seokho Hyun),전필선(Pilsun Jun),정성민(Sungmin Jung),박정배(Jeongbae Park) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.5
고속비행체의 연료 공급 및 냉각 시스템에 사용되는 흡열연료의 초임계 환경을 구현할 수 있는 시험장치를 구성하고 이를 통해 흡열연료의 열적특성을 확인하였다. 특히 2단 가열장치의 가열시간, 가열온도를 변수로 하여 출력되는 흡열연료의 온도 변화를 확인하고, 촉매분해반응을 활성화할 수 있는 흡열연료의 온도를 구현하였다. 본 연구결과는 향후 냉각시스템을 위한 촉매분해반응 시험과 운용환경에 따른 구성품 환경시험에 활용할 수 있다. The thermal characteristics of the endothermic fuel was verified through composition of the test equipment which enables to drive supercritical condition of fuel in terms of a fuel supply and cooling system of high-speed vehicles. Especially, the temperature variation of the endothermic fuel by parameters in heating time and heating temperature of the second stage heating equipment were verified, and the endothermic fuel temperature which activates catalytic decomposition was also driven. The result of this paper can be utilized in adoption to the catalytic decomposition test for a cooling system and the component environmental test according to operational conditions.
김민상(Minsang Kim),현석호(Seokho Hyun),전필선(Pilsun Jun),박정배(Jeongbae Park) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
고속비행체의 연료 공급 및 냉각 시스템에 적용 가능한 고온고압 밸브를 개발하였다. 밸브 경량화를 위해 외형 사이즈를 최소화 하였고 씰(seal) 적용부를 최소화 하여 누설에 대한 강성 설계를 진행하였다. 또한 밸브 내 압력강하를 최소화하기 위해 유동해석을 통한 내부 유로를 설계하였고 최종적으로 고속비행체의 고온의 흡열연료를 모사하는 시험장비에 밸브를 설치하여 밸브 성능을 검증 하였다. A valve used in a high temperature and pressure condition for high-speed vehicle application was developed for fuel supply and cooling system. For weight reduction purpose, the size outline of valve was optimized based on its performance and operating environment. And the rigidity design was adopted by minimizing uses of sealing parts to prevent leakages. Also, A fluid analysis was performed to derive the optimized internal flow path design in consideration of minimized pressure drop. Finally, the valve performance was verified by installing the valve into the test equipment which enable to simulate endothermic fuel of high temperature in high-speed vehicle.
현동훈(Donghun Hyeon),이태호(Tae Ho Lee),현석호(Seok-ho Hyun),정병훈(Byung Hun Jeong),한정식(Jeong Sik Han),박정배(Jeongbae Park),김성현(Sung Hyun Kim) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.5
극초음속 비행체에서는 공기와의 마찰열과 엔진열의 증가로 기체 내부의 열적 부하가 발생한다. 이는 비행체 내부 구조물의 변형을 일으키고 오작동을 발생시킬 수 있다. 흡열연료는 액체 탄화수소 연료로 흡열반응을 통해 열을 흡수할 수 있는 연료이다. 본 연구에서는 exo-tetrahydrodicyclopentadiene을 모델연료로 선정하고 흡열 냉각 시스템에 제올라이트 촉매를 사용하여 흡열반응을 수행하였다. 본 연구의 목적은 흡열량 향상에 미치는 촉매의 특성을 연구하는 것이다. 이 촉매는 exo-THDCP를 흡열연료로 사용하는 시스템에 적용될 수 있을 것이다. In hypersonic aircraft, increase of aerodynamic heat and engine heat leads heat loads in airframe. It could lead structural change of aircraft’s component and malfunctioning. Endothermic fuels are liquid hydrocarbon fuels which are able to absorb the heat load by undergoing endothermic reactions. In this study, exo-tetrahydrodicyclopentadiene was selected as a model endothermic fuel and experiments were investigated in endothermic fuel cooling system with zeolite catalyst. The object of this study is inspect catalyst properties which have effect on heat absorption improvement. This catalyst could be applied to system that use exo-THDCP as endothermic fuel.