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수직환형유로에서 상향유동 초임계압 CO₂의 열전달 특성
강덕지(Deog Ji Kang),김신(Sin Kim),김환열(Hwan Yeol Kim),배윤영(Yoon Yeong Bae) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Heat transfer experiments at a vertical annulus passage were carried out in the SPHINX(Supercritical Pressure Heat Transfer Investigation for NeXt Generation) to investigate the heat transfer behaviors of supercritical CO₂. The collected test data are to be used for the reactor core design of the SCWR (SuperCritical Water-cooled Reactor). The mass flux was in the range of 400 ~1200 ㎏/㎡s and the heat flux was chosen up to 150 ㎾/㎡. The selected pressures were 7.75 and 8.12 ㎫. The heat transfer data were analyzed and compared with the previous tube test data. The test results showed that the heat transfer characteristics were similar to those of the tube in case of a normal heat transfer mode and degree of heat transfer deterioration became smaller than that in the tube. Comparison of the experimental heat transfer coefficients with the predicted ones by the existing correlations showed that there was not a distinct difference between the correlations.
강덕지,고영주,이경진,김신 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.2
Bubble detection is one of the most important measurements in the two-phase flows. For the purpose of the bubble detection, an optical fiber is used based on the fact that. An intensity of attenuated light varies according to the surrounding medium at the exposed core. Experiments are conducted to investigate. (1) the effect of length and diameter of the exposed core, (2) the effect of the shape of the exposed core (3) the effect of the size of the bubble, on the detection capability. The possibility of bubble detection with optical fibers is present in some geometrical conditions of optical fibers.