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논문 기본 정보

자료유형
학술저널
저자정보
찬탄짬 (Korea Atomic Energy Research Institute) 김병재 (Chungnam National University) 박현식 (Korea Atomic Energy Research Institute)
저널정보
한국가시화정보학회 한국가시화정보학회지 한국가시화정보학회지 Vol.15 No.3
발행연도
2017.12
수록면
20 - 26 (7page)

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초록· 키워드

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The two-fluid equations are widely used to simulate two-phase flows in a nuclear reactor. For the two-fluid momentum equation, the wall and interfacial drag terms play an important role in predicting a two-phase flow behavior. Since the bubble density is much smaller than the water density, the bubble accelerates faster than the liquid in a nozzle. As a result, the bubble phase becomes faster than the liquid phase in the nozzle. In contrast, the opposite phenomena occur in the diffuser. The purpose of our study is to experimentally show these behaviors in an area-varying channel such as nozzle and diffuser. Experiments were made of turbulent bubbly flows in an area-varying horizontal channel. The velocities of the bubble and liquid phases were measured by the PIV technique. It was shown that the two-phase velocities were no longer close to each other in the area-varying regions. The bubble was faster than the liquid in the nozzle; in contrast, the bubble was slower than the liquid in the diffuser. Code simulations were also performed using the MARS code. By replacing the original wall drag model in the MARS code with Kim (1)’s wall drag partition model, we obtained the simulation results being consistent with experimental observations.

목차

Abstract
1. 서론
2. 실험 방법
3. 실험결과
4. MARS 코드 해석 결과
5. 결론
REFERENCE

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