Journal of Hydrogen and New Energy (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Effect of Horizontal Distance of Cold Cylinders on Natural Convection of Gaseous Hydrogen in a Physical Storage Container

냉각 실린더의 수평 거리가 저장 용기 내부의 기체 수소 자연대류 현상에 미치는 영향

  • YOUNG MIN SEO (Hydrogen Electric Research Team, Korea Electrotechnology Research Institute) ;
  • HYUN WOO NOH (Hydrogen Electric Research Team, Korea Electrotechnology Research Institute) ;
  • DONG WOO HA (Hydrogen Electric Research Team, Korea Electrotechnology Research Institute) ;
  • TAE HYUNG KOO (Hydrogen Electric Research Team, Korea Electrotechnology Research Institute) ;
  • ROCK KIL KO (Hydrogen Electric Research Team, Korea Electrotechnology Research Institute)
  • 서영민 (한국전기연구원 수소전기연구팀) ;
  • 노현우 (한국전기연구원 수소전기연구팀) ;
  • 하동우 (한국전기연구원 수소전기연구팀) ;
  • 구태형 (한국전기연구원 수소전기연구팀) ;
  • 고락길 (한국전기연구원 수소전기연구팀)
  • Received : 2023.06.07
  • Accepted : 2023.06.22
  • Published : 2023.06.30
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Abstract

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 104≤Ra≤106 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.

Keywords

Acknowledgement

이 연구는 2023년도 정부(과학기술정보통신부)의 재원으로 국가과학기술연구회의 지원을 받아 수행된 한국전기연구원 기본 사업임(No. 23A01043).

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