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Thermal conductivity measurement and characterization of binary nanofluids.

Author(s) : JUNG J. Y., CHO C., LEE W. H., et al.

Type of article: Article

Summary

Binary nanofluids, nanoparticle suspensions in binary mixture, are developed to enhance the heat and mass transfer performance of absorption refrigeration cycles. To stabilize the nanoparticles in a strong electrolyte, polymer is used as a steric stabilizer. The effective thermal conductivities of the binary nanofluids with the concentrations of nanoparticle up to 0.1 vol% are measured using the transient hot wire method. Comparing the thermal conductivity change with time, it is found that the dispersion stability of nanofluids is a dominant factor for enhancing the thermal conductivity of binary nanofluids. It is also found that the thermal conductivity of the binary nanofluids (H2O/LiBr binary mixture with Al2O3 nanoparticles) increases with the particle volume concentration and enhances by 2.2% at 0.1 vol% concentration condition. Also a modified dimensionless group is proposed to find the maximum radius of nanoparticles to maintain stable nanofluids. In this study, it was estimated at about 1.3 µm. [Reprinted with permission from Elsevier. Copyright, 2011].

Details

  • Original title: Thermal conductivity measurement and characterization of binary nanofluids.
  • Record ID : 30001804
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 54 - n. 9-10
  • Publication date: 2011/04
  • DOI: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2011.01.021

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