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나노유체 : 임계열유속 및 사고 저항성 증진을 위한 크로미아 나노유체 활용
손규민 ( Gyu Min Son ),서한 ( Han Seo ),문성보 ( Sung Bo Moon ),서석빈 ( Seok Bin Seo ),방인철 ( In Cheol Bang ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
Hydrogen explosion can threaten the safety of nuclear power plants as shown in Fukushima accident. When zircaloy (fuel cladding) is oxidized, it generates hydrogen and oxidation speeds up at high temperature. The concept of accident-tolerant-fuel (ATF) aims for enhanced safety response, mitigating oxidation of fuel claddings during accident and chrome coating on zircaloy surface shows promising results in this regard. By forming Cr2O3 (chromia or chrome oxide) layer on the outermost surface when oxidized, it prevents further oxidation inwards. However chrome coatings show some limitations since it forms hydrophobic surface and damages critical heat flux (CHF). Instead, direct coating of chromia layer is proposed in this study. Chromia coating on nichrome wire was done by boiling deposition of chromia nanofluid. Chrome coating with PVD was also prepared for comparison. Pool boiling experiment results show that chromia coated wire’s CHF is approximately twice of bare and chrome coated wires. For explanation of CHF enhancement, contact angle was compared showing chromia coating has hydrophilic surface. To ensure that direct coating of chromia has oxidation resistance, samples are oxidized in furnace and weight gain was compared.