Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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Study on the Oxidation Treatment of Nanoparticles for the Critical Heat Flux

임계열유속 향상을 위한 나노물질의 산화처리에 대한 연구

  • Kim, Woo-Joong (Korea Electric Vehicle Maintenance Cooperative) ;
  • Jeon, Yong-Han (Department of Fire and Frotection, Sangji-Youngseo College) ;
  • Kim, Nam-Jin (Department of Nuclear & Energy Engineering, Jeju National Univ.)
  • 김우중 (한국전기차정비협동조합) ;
  • 전용한 (상지영서대학교 소방안전과) ;
  • 김남진 (제주대학교 에너지공학과)
  • Received : 2017.08.23
  • Accepted : 2017.12.29
  • Published : 2017.12.30
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Abstract

Pool boiling, one of the key thermal-hydraulics phenomena, has been widely studied for improving heat transfer efficiencies and safety of nuclear power plants, refrigerating systems, solar-collector heat pipes, and other facilities and equipments. In the present study, the critical heat flux (CHF) and heat-transfer coefficients were tested under the pool-boiling state using graphene M-5 and M-15 nanofluids as well as oxidized graphene M-5 nanofluid. The results showed that the highest CHF increase for both graphene M-5 and M-15 was at the 0.01% volume fraction and, moreover, that the CHF-increase ratio for small-diameter graphene M-5 was higher than that for large-diameter graphene M-15. Also at the 0.01% volume fraction, the oxidized graphene M-5 nanofluid showed a 41.82%-higher CHF-increase ratio and a 26.7%-higher heat-transfer coefficient relative to the same nanofluid without oxidation treatment at the excess temperature where the CHF of distilled water occurs.

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References

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