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

• Published in: Journal of the Korean Solar Energy Society Vol. 37; no. 6; pp. 39 - 49
• Main Authors: Kim, Woo-Joong, Jeon, Yong-Han, Kim, Nam-Jin
• Format: Journal Article
• Language: English
• Published: 한국태양에너지학회 01.12.2017
• Subjects: 기타공학; 비등(Boiling); 열전달(Heat transfer); 그래핀(Graphene); 임계열 유속(Critical heat flux); 산화(Oxidation)
• ISSN: 1598-6411; 2508-3562
• DOI: 10.7836/kses.2017.37.6.039

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. KCI Citation Count: 1