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논문 기본 정보

자료유형
학술저널
저자정보
황돈관 (포항공과대학교) 최낙준 (포항공과대학교) 정우현 (포항공과대학교) 김태일 (포항공과대학교) 이요한 (포항공과대학교) 조항진 (포항공과대학교)
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제55권 제5호
발행연도
2023.5
수록면
1,604 - 1,615 (12page)
DOI
10.1016/j.net.2023.01.023

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In an open-pool type research reactor with a downward forced flow in the core, pipes can be under sub atmospheric pressure because of the large pressure drop at the reactor core in the atmospheric pool. Sub atmospheric pressure can result in air inflow into the pipe from the pressure difference between the atmosphere and the inside of the pipe, which in a postulated pipe break scenario can lead to the breakdown of the cooling pump. In this study, a plant-scale experiment was conducted to study air inflow in large piping systems by considering the actual operational conditions of an advanced research reactor. The air inflow rate was measured, and the entrained air was visualized to investigate the behavior of air inflow and flow regime depending on the pipe break size. In addition, the developed drift flux model for a large vertical pipe with a diameter of 600 mm was compared with other correlations. The flow regime transition in a large vertical pipe under downward flow was also studied using the newly developed drift-flux model. Consequently, the characteristics of two-phase flow in a large vertical pipe were found to differ from those in small vertical pipes where liquid recirculation was not dominant.

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