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http://dx.doi.org/10.7836/kses.2017.37.6.039

Study on the Oxidation Treatment of Nanoparticles for the Critical Heat Flux  

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.)
Publication Information
Journal of the Korean Solar Energy Society / v.37, no.6, 2017 , pp. 39-49 More about this Journal
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.
Keywords
Heat transfer; Boiling; Graphene; Oxidation; Critical heat flux;
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