액화수소 이중단열배관에서 서포트 개수 및 유속변화가 열적 거동에 미치는 영향에 대한 수치해석 연구 = Numerical Analysis of the Effects of Support Quantity and Flow Velocity on the Thermal Behavior of Double-Wall Vacuum-Insulated Liquid Hydrogen Piping

다국어 초록 (Multilingual Abstract)

Vacuum-insulated double-wall piping systems are commonly used for the transportation of liquefied hydrogen due to their thermal insulation characteristics. However, structural supports penetrating the vacuum layer act as heat transfer paths and contribute to heat leakage into the cryogenic fluid. In addition, the thermal behavior of the system is influenced by flow conditions, such as the inlet flow velocity. In this study, a numerical analysis was conducted to examine the effects of support count and inlet flow velocity on the thermal behavior of a vacuum-insulated double-wall pipe for liquefied hydrogen. Several support configurations with different numbers of supports were considered, and the inlet flow velocity was varied. Since direct modeling of high-vacuum conditions is limited in conventional CFD analysis, the vacuum layer was replaced with a solid region having an equivalent thermal conductivity. Steady-state conjugate heat transfer simulations were performed using ANSYS Fluent. The results indicate that changes in the number of supports affect the heat transfer characteristics of the piping system. As the support count increased, the temperature difference between the inlet and outlet of the inner pipe also increased. In addition, variations in inlet flow velocity influenced the outlet temperature behavior of the system. Based on these results, it can be concluded that support configuration and inlet flow velocity are factors to be considered in the thermal analysis and design of vacuum-insulated piping systems for liquefied hydrogen.

목차 (Table of Contents)

• 제1장 서론 1
• 1.1 연구 배경 1
• 1.2 연구 목적 3
• 제2장 수치해석 5
• 2.1 열전달 이론 5
• 2.2 지배방정식 5
• 2.3 난류 모델 7
• 2.4 해석 모델 구성 9
• 2.5 해석 조건 및 경계조건 13
• 제3장 해석 결과 및 고찰 17
• 3.1 서포트 개수 및 유속 변화에 따른 출구 온도 상승 특성 17
• 3.2 2-Support 조건에서의 유속 변화에 따른 열적 거동 21
• 3.3 3-Support 조건에서의 유속 변화에 따른 열적 거동 28
• 3.4 5-Support 조건에서의 유속 변화에 따른 열적 거동 34
• 제4장 결론 40
• 참고문헌 43