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초고온가스로 핵분열생성물 거동해석용 전산 소프트웨어의 화학반응 모듈 개발
윤철(Churl Yoon),탁남일(Nam-il Tak),임홍식(Hong Sik Lim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The Korea Atomic Energy Research Institute (KAERI) has been developing a computer software to analyze the behaviors of the fission products (FP) circulating in the primary coolant loop and in the containment for a very high temperature gas-cooled reactor (VHTR). This software, named GAMMA-FP (GAs Multicomponent Mixture Analysis- Fission Products module), consists of four interconnecting modules, which are the thermal dynamics module, the gaseous and the aerosol fission product analysis modules, and the chemical reaction module. The thermal dynamics module calculates the wall temperature and fluid properties as well as fluid velocities and temperatures within the control volumes, and transfers those data to the other modules. The aerosol FP module adopts a multi-component and multi-sectional aerosol analysis model (MAEROS model), and has been improved for 1-D aerosol transport. The gaseous FP module was developed to analyze the fission product plateout within the primary circuit as well as in the containment, which was validated against experiment data. In this study, strategies of the FP chemical reaction module development have been investigated. The general thermal equilibrium model was used for high temperature regions, and the frozen chemistry model was adopted for low temperature regions. The empirical chemisorption models were considered for the chemical reactions of radioactive FP gases with structural materials. These implemented chemical reaction models will be verified and validated in the next stage of the research.
초고온가스로 모사 실험회로 설계를 위한 전산유체역학 해석
윤철(Churl Yoon),홍성덕(Sung Deok Hong),노재만(Jae Man Noh),김용완(Yong Wan Kim),장종화(Jong Hwa Chang) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.5
한국원자력연구원에서는 초고온가스로를 모사할 수 있는 중형 헬륨 회로를 건설 중에 있다. 이 실험 헬륨 회로에서 두 개의 전기 가열기가 헬륨 유체를 1 ~ 9 ㎫ 의 압력 하에서 950℃ 까지 가열하게 된다. 이 실험 헬륨 회로의 설계 사양을 최적화하기 위하여, 본 연구에서는 두 개의 가열기 중 하류에 위치한 고온 헬륨가열기 안의 복합열전달 현상을 전산유체역학으로 해석하였다. 해석 결과에서 헬륨 가열기 내 최대 온도는 허용 한계를 넘지 않았고, 이로써 선정된 기하구조의 열적 특성은 설계요건을 만족함이 확인되었다. A medium-scale helium loop that can simulate a VHTR (very-high-temperature reactor) is now under construction at the Korea Atomic Energy Research Institute. The heaters of the test helium loop electrically heat helium fluid up to 950℃ at pressures of 1 to 9 ㎫. To optimize the design specifications of the experimental helium loop, the conjugate heat transfer in the high-temperature helium heater was analyzed by performing a CFD simulation. The analysis results indicate that the maximum temperature does not exceed the allowable limit. It is confirmed that the thermal characteristics of the loop with the given geometry satisfy the design requirements.
대향식 스퍼터링법으로 증착된 ITO 양극 위에 제작된 OLED 성능
윤철(Chul Yoon),김상호(Sang-Ho Kim) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.5
Indium tin oxide (ITO) has been commonly used as an anode for organic light emitting diode (OLED), because of its relatively high work function, high transmittance, and low resistance. The ITO was mostly deposited by capacitive type DC or RF sputtering. In this study we introduced a new facing target sputtering method. On applying this new sputtering method, the effect of fundamental deposition parameters such as substrate heating and post etching were investigated in relation to the resultant I-V-L characteristics of OLED. Three kinds of ITOs deposited at room temperature, at 400℃ and at 400℃ with after surface modification by O₂ plasma etching were compared. The OLED on ITO deposited with substrate heating and followed by etching showed better I-V-L characteristics, which starts to emit light at 4 volts and has luminescence of 65 cd/㎡ at 9 volts. The better I-V-L characteristics were ascribed to the relevant surface roughness with uniform micro-extrusions and to the equi-axed micromorphology of ITO surface.