냉각 실린더의 수평 거리가 저장 용기 내부의 기체 수소 자연대류 현상에 미치는 영향 (Effect of Horizontal Distance of Cold Cylinders on Natural Convection of Gaseous Hydrogen in a Physical Storage Container)

서지정보

· 발행기관 : 한국수소및신에너지학회
· 수록지 정보 : 한국수소및신에너지학회논문집 / 34권 / 3호 / 274 ~ 282페이지
· 저자명 : 서영민, 노현우, 하동우, 구태형, 고락길

초록

This study conducted direct numerical simulations of the natural convection phenomena of gaseous hydrogen in a physical storage container containing four circular cylinders. Rayleigh numbers (Ra) in the range of 10 4 ≤Ra ≤10 6 and a Prandtl number (Pr)=0.69 (gaseous hydrogen) were considered.
The main parameter is a horizontal distance of four circular cylinders and the values of εh=0.1, 0.2, 0.3, 0.4, and 0.5 are considered. The flow and thermal structures and corresponding heat transfer characteristics are investigated with respect to the transition of the flow regime. The time- and surface-averaged Nusselt number on the cylinder surface and the wall of physical storage container increased by about 57% and 69% according to the Ra and εh, respectively.
Thus, the horizontal distance has an influence on the heat transfer characteristics on natural convection of gaseous hydrogen.

영어초록

This study conducted direct numerical simulations of the natural convection phenomena of gaseous hydrogen in a physical storage container containing four circular cylinders. Rayleigh numbers (Ra) in the range of 10 4 ≤Ra ≤10 6 and a Prandtl number (Pr)=0.69 (gaseous hydrogen) were considered.
The main parameter is a horizontal distance of four circular cylinders and the values of εh=0.1, 0.2, 0.3, 0.4, and 0.5 are considered. The flow and thermal structures and corresponding heat transfer characteristics are investigated with respect to the transition of the flow regime. The time- and surface-averaged Nusselt number on the cylinder surface and the wall of physical storage container increased by about 57% and 69% according to the Ra and εh, respectively.
Thus, the horizontal distance has an influence on the heat transfer characteristics on natural convection of gaseous hydrogen.

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