Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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NATURAL CIRCULATION ANALYSIS CONSIDERING VARIABLE FLUID PROPERTIES WITH THE CUPID CODE

CUPID 코드의 유체 물성치 변화를 고려한 자연대류 해석

  • Lee, S.J. (Korea Atomic Energy Research Institute, Thermal Hydraulics Safety Research Div.) ;
  • Park, I.K. (Korea Atomic Energy Research Institute, Thermal Hydraulics Safety Research Div.) ;
  • Yoon, H.Y. (Korea Atomic Energy Research Institute, Thermal Hydraulics Safety Research Div.) ;
  • Kim, J. (Dept. of Mechanical System and Design Engineering, Seoul National Univ. of Science and Technology)
  • 이승준 (한국원자력연구원 열수력안전연구부) ;
  • 박익규 (한국원자력연구원 열수력안전연구부) ;
  • 윤한영 (한국원자력연구원 열수력안전연구부) ;
  • 김정우 (서울과학기술대학교 기계시스템디자인공학과)
  • Received : 2015.09.08
  • Accepted : 2015.12.23
  • Published : 2015.12.31
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Abstract

Without electirc power to cool down the hot reactor core, passive systems utilizing natural circulation are becoming a big specialty of recent neculear systems after the severe accident in Fukusima. When we consider the natural circulation in a pool, thermal mixing phenomena may start from single phase circulation and can continue to two phase condition. Since the CUPID code, which has been developed for two-phase flow analysis, can deal with the phase transition phenomena, the CUPID would be pertinent to natural convection problems in single- and two-phase conditions. Thus, the CUPID should be validated against single- and two-phase natural circulation phenomena. For the first step of the validation process, this study is focused on the validation of single-phase natural circulation. Moreover, the CUPID code solves the fluid properties by the relationship to pressure and temperature from the steam table considering non-condensable gas effects, so that the effects from variable properties are included. Simple square thermal cavity problems are tested for laminar and turbulent conditions against numerical and experimental data. Throughout the investigation, it is found that the variable properties can affect the flow field in laminar condition, but the effect becomes weak in turbulence condition, and the CUPID code implementing steam table is capable of analyzing single phase natural circualtion phenomena.

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References

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