Journal of the Korea Safety Management & Science (대한안전경영과학회지)

Korea Safety Management & Science (대한안전경영과학회)
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Critical heat flux measurement experiment to improve safety of copper nano-particle coated heat exchanger

구리나노입자가 코팅된 열교환기의 안전성 향상을 위한 임계 열유속 측정실험

  • Mo, Yong-Hyun (Dept. of Nuclear & Energy Engineering, Jeju National Univ.) ;
  • Kim, Nam-Jin (Dept. of Nuclear & Energy Engineering, Jeju National Univ.) ;
  • Jeon, Yong-Han (Dept. of Fire and Frotection, Sangji-Youngseo College.) ;
  • Lee, Deok-Soo (Dept. of Fire and Frotection, Sangji-Youngseo College.)
  • 모용현 (제주대학교 에너지공학과) ;
  • 김남진 (제주대학교 에너지공학과) ;
  • 전용한 (상지영서대학교 소방안전과) ;
  • 이덕수 (한라대학교 산업경영공학과)
  • Published : 2017.12.31
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Abstract

When the heat flux on the heating surface following changing heat condition in the boiling heat transfer system exceeds critical heat flux, the critical heat flux phenomenon is going over to immediately the film boiling area and then it is occurred the physical destruction phenomenon of various heat transfer systems. In order to maximize the safe operation and performance of the heat transfer system, it is essential to improve the CHF(Critical Heat Flux) of the system. Therefore, we have analysis the effect of improving CHF and characteristics of heat transfer following the nanoparticle coating thickness. As the results, copper nanocoating time are increased to CHF, and in case of nano-coatings are increased spray-deposited coating times more than in the fure water; copper nanopowder is increased up to 6.40%. The boiling heat transfer coefficients of the pure water are increased up to 5.79% respectively. Also, the contact angle is decreased and surface roughness is increased when nano-coating time is increasingly going up.

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References

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