점성가열 효과에 의한 곡관 내 극저온 유체의 온도 변화

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 35; no. 4; pp. 428 - 436
• Main Authors: 강효림(HYO LIM KANG), 고인재(IN JAE KO), 한승호(SEUNG HO HAN)
• Format: Journal Article
• Language: Korean
• Published: 한국수소및신에너지학회 2024
• Subjects: 기계공학; Bend(곡관); Turbulence(난류); Computational fluid dynamics(전산 유체 해석); Cryogenic(극저온); Viscous heating effect(점성가열 효과)
• ISSN: 1738-7264; 2288-7407
• DOI: 10.7316/JHNE.2024.35.4.428

Liquid hydrogen, which operates in cryogenic environments has a density 800 times greater than gaseous hydrogen, making it advantageous for large-scale storage and transportation. However, continuous evaporation due to external heat intrusion and internal heat generation poses challenges. To mitigate heat conduction, various insulation materials are used. In pipe systems, viscous heating effects from turbulence and viscosity, especially in bends, cause heat generation. This study employs computational fluid dynamics (CFD) to analyze the impact of fluid velocity, pressure drop, inner diameter, and curvature radius of pipe bends on viscous heating. Using liquid nitrogen at 77 K as a working fluid, the CFD results showed that increased velocity and pressure drop along with smaller inner diameter and curvature radius enhanced viscous heating, raising fluid temperature.