Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Evaluation of Thermal Behavior of Oil-based $Al_2O_3$ Nanofluids

오일 기지 알루미나 나노유체의 열적거동 평가

  • Choi, Cheol (Strategic Technology Laboratory, Korea Electric Power Research Institute(KEPRI)) ;
  • Yoo, Hyun-Sung (Strategic Technology Laboratory, Korea Electric Power Research Institute(KEPRI)) ;
  • Oh, Je-Myung (Strategic Technology Laboratory, Korea Electric Power Research Institute(KEPRI))
  • 최철 (한전 전력연구원 전략기술연구소 신소재그룹) ;
  • 유현성 (한전 전력연구원 전략기술연구소 신소재그룹) ;
  • 오제명 (한전 전력연구원 전략기술연구소 신소재그룹)
  • Published : 2006.11.09
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Abstract

Two kinds of alumina nanofluids are prepared by dispersing $Al_2O_3$ nanoparticles m transformer oil. The thermal conductivity of the nanoparticle-oil mixtures increases with particle volume fraction and thermal conductivity of the solid particle itself. The $Al_2O_3$ nanoparticles at a volume of 0.5% can increase the thermal conductivity of the transformer oil by 5.7%, and the overall heat transfer coefficient by 20%. From the natural convection test using a prototype transformer, the cooling effect of $Al_2O_3$-oil nanofluids on the heating element and oil itself is confirmed. However, excessive quantities of the surfactant have a harmful effect on viscosity, and thus it is strongly recommended to control the addition of the surfactant with great care.

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