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이종철,김윤제,김철수,Lee, Jong C.,Kim, Youn J.,Kim, C.-S. 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.3
In this study, experimental and numerical analyses are carried out to investigate the performance of centrifugal pump with various air admitting conditions. Experiments on the pump performance under air-water two-phase flow are accomplished using a centrifugal pump with semi-open type impeller having three, five and seven blades, respectively. Also, the numerical analysis of turbulent air-water two-phase flow using the finite volume method has been carried out to obtain the pressure, velocities and void fraction on the basis of a so-called bubbly flow model with the constant size and shape of cavity. The results obtained through this study show the reasonable agreements within the range of bubbly flow regime. There are promising developments concerning application of the present study for the flow in a centrifugal pump with two-phase flow conditions and efforts must be followed to improve the turbulence model and two-phase flow model for turbomachinery.
이종철(Jong C. Lee),안희섭(Heui-Sub Ahn),최종웅(Jong-Ung Choi),김윤제(Youn J. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Arcs have long been used as a light and a heat source. Modern industrial applications demand the arc<br/> discharge to be run at a power level which has not been encountered hitherto. Because of the high power level<br/> encountered, there is a strong interaction between the arc discharges and their surroundings. This interaction<br/> makes quantitative prediction of industrial arc plasma systems extremely difficult. The design of such systems<br/> is still largely based on trial and error although the situation is rapidly improving because of the available<br/> computational power at a cost which is still rapidly coming down. The desire to predict the behavior of arc<br/> plasma system, thus reducing the development cost, has been the motivation of arc research. The most<br/> enormous duty of a circuit breaker is to interrupt fault current in a circuit, thereby protecting other<br/> components from damage. This is achieved by separating the two contacts in a gas or a liquid, and an arc is<br/> inevitably established between the contacts. The arc must be controlled during the high current phase of the<br/> AC cycle and interrupted at an appropriate current zero. In this paper, we have simulated the flow<br/> characteristics of high current arc and surrounding gas in a SF6 gas circuit breaker. This is based on an arc<br/> model which takes account of the turbulence enhanced momentum and heat transfer and the radial radiation<br/> transfer (including re-absorption at the edge of the arc). The radiation transfer in a circuit breaker is calculated<br/> based on a monotonic radial temperature profile from the axis. The temperature, velocity, electric field as well<br/> as the pressure can easily be visualized under arcing conditions.
위장관 11 : Helicobacter pylori 의 치료에 있어서 일주일간이 3 제병합요법의 제균 효과에 관한 전향적 무작위 연구
김영호(Y . H . Kim),김재준(J . J . Kim),성인경(I . K . Sung),손희정(H . J . son),이규택(Kyu Taek Lee),이풍렬(Poong Lynl Rhee),고광철(K . C . Kho),백승운(Semg Woon Paik),이종철(Jong Chul Rhee),최규완(Kyoo Wan Choi) 대한소화기학회 1998 대한소화기학회 추계학술대회 Vol.1998 No.-