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기체-액체 밀도비가 열 교환기 헤더 내 2 상 유동분배에 미치는 영향 - 실험적 연구
기준우(June Woo Kee),김석(Seok Kim),이상용(Sang Yong Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Dependence of two-phase flow distribution on the gas-liquid density ratio for a D-shaped header of heat exchangers was studied experimentally using air and water as the test fluids. The density ratio was regulated by changing the system pressure from 100 ㎪ to 600 ㎪. The header was made of transparent acrylic for flow visualization and installed vertically. Eight inlet and ten exit flat tubes were connected horizontally with their vertical intervals of 13㎜. Each tube composed of eight sub-channels of 1 ㎜ × 1㎜. In general, with the higher pressure, more amount of water flows to the upper portion of the header and such a tendency was more enhanced as the total flow rate was decreased.
기준우(June Woo Kee),김석(Seok Kim),김영인(Young In Kim) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
The preheating system is composed of the preheating tank, preheating steam lines, steam generators, and preheating down-comer lines. The main function of the preheating operation is to increase the temperature of the reactor coolant system(RCS) from room temperature to hot zero power condition using the heat from the reactor coolant pumps(RCPs) and the preheating tank heaters. The major parameters of the preheating tank design are the preheating tank volume, the preheating tank heater capacity, the velocity inside each pipe line, etc. In the present study, the numerical simulations of the preheating system were performed to check the availability of the preheating system design and the sensitivity analysis of each parameter was conducted.