한국분무공학회지 (Journal of ILASS-Korea)

  • 제19권4호
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  • Pages.174-181
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  • 2014
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  • 1226-2277(pISSN)
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  • 2288-9051(eISSN)
한국분무공학회 (Institute for Liquid Atomization and Spray Systems-Korea)
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Experimental Investigation of Coupling Effects between Particle Size and Temperature on the Thermal Conductivity of Alumina Nanofluids

  • Lee, Ji-Hwan (Korea Aerospace University, BK21PLUS Department of Fundamental Technology for Korean Space Launch Vehicle and Space System) ;
  • Jang, Seok Pil (Korea Aerospace University, School of Aerospace and Mechanical Engineering) ;
  • Lee, Seung-Hyun (Korea Aerospace University, School of Aerospace and Mechanical Engineering) ;
  • Park, Yong-Jun (Korea Aerospace University, School of Aerospace and Mechanical Engineering) ;
  • Kim, Dong Jin (Korea Aerospace University, School of Aerospace and Mechanical Engineering) ;
  • Koo, Jaye (Korea Aerospace University, School of Aerospace and Mechanical Engineering)
  • 투고 : 2014.09.24
  • 심사 : 2014.12.24
  • 발행 : 2014.12.31
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초록

This study investigates the effects of nanoparticle size and temperature on the thermal conductivity enhancement of water-based alumina ($Al_2O_3$) nanofluids, using the centrifuging method and relative centrifugal forces of differing magnitude to produce nanofluids of three different particles without involving any dispersants or surfactants. We determined the coupling dependency in thermal conductivity enhancement relative to nanoparticle size and temperature of the alumina nanofluids and also experimentally showed that the effect of temperature on thermal conductivity is strongly dependent on nanoparticle size. Also, our experimental data presented that the effective medium theory models such as the Maxwell model and Hasselman and Johnson model are not sufficient to explain the thermal conductivity of nanofluids since they cannot account for the temperature- and size-dependent nature of water-based alumina nanofluids.

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참고문헌

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