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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Preparation of High-Efficient Oil-based Nanofluids and It's Application to the Transformer

고효율 나노절연유 제조 및 변압기에의 적용

  • Yoo, Hyun-Sung (Strategic Technology Laboratory, Korea Electric Power Research Institute(KEPRI)) ;
  • Choi, Cheol (Strategic Technology Laboratory, Korea Electric Power Research Institute(KEPRI)) ;
  • Oh, Je-Myung (Strategic Technology Laboratory, Korea Electric Power Research Institute(KEPRI))
  • 유현성 (한전 전력연구원 전략기술연구소 신소재그룹) ;
  • 최철 (한전 전력연구원 전략기술연구소 신소재그룹) ;
  • 오제명 (한전 전력연구원 전략기술연구소 신소재그룹)
  • Published : 2007.06.21
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Abstract

Oil-based nanofluids are prepared by dispersing spherical and fiber-shaped $Al_2O_3$ and AlN nanoparticles in transformer oil. Two hydrophobic surface modification processes are compared in this investigation. It is obvious that the combination of nanoparticle, surfactant and surface modification process is very important for the dispersity of nanofluids. For ($Al_2O_3$+AIN) particles with 1% volume fraction, the enhancement of thermal conductivity and convective heat transfer coefficient is nearly 11% and 30%, respectively, compared to pure transformer oil. The cooling effect of ($Al_2O_3$+AlN)-oil nanofluids on the heating element and oil itself is confirmed by a natural convection test using a prototype transformer.

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