비확산 액체질소 풀이 형성된 콘크리트 판의 열전도 모델 평가

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 32; no. 5; pp. 365 - 373
• Main Authors: 김명배(MYUNGBAE KIM), Le-Duy NguYen, 정경열(KYUNGYUL CHUNG), 한용식(YONGSHIK HAN), 조성훈(SUNGHOON CHO)
• Format: Journal Article
• Language: Korean
• Published: 한국수소및신에너지학회 2021
• Subjects: 기계공학; Perfect thermal contact(완전한 열적 접촉); Heat conduction model(열전도 모델); Concrete ground(콘크리트 그라운드); Liquid nitrogen pool(액체질소 풀); Non-spreading(비확산)
• ISSN: 1738-7264; 2288-7407

In this study, evaporation of LN2 non-spreading pool on concrete plate was dealt with experimentally. The thermophysical properties of concrete, which is a composite material, were obtained by minimizing the difference between the numerical analysis results obtained from the assumed properties and the results from experiments. The thermal energy required for evaporation of the liquid pool is supplied from the concrete plate and the wall of the container. As a result of the measurement, the thermal energy flowing in from the wall was negligible compared to the one supplied from the concrete plate. It was found that the measured evaporation rate of the liquid pool by the heat energy supplied through the concrete plate agrees well with the PTC model except for the initial section of the experiment. The validity of the semi-infinite assumption and the one-dimensional assumption, which are the main conditions of the PTC model, was also verified through experiments. The evaporation rate model in the non-spreading pool discussed in this study can provide a basic frame for the one in the spreading pool, which is a meaningful result considering that the spreading pool is very realistic compared to the non-spreading pool.