Experimental investigation and proposed correlations for temperaturedependent thermal conductivity enhancement of ethylene glycol based nanofluid containing ZnO nanoparticles

Document Type : Full Length Research Article

Authors

Faculty of mechanical engineering, Semnan University, Semnan, Iran

Abstract

Experimental study of effective thermal conductivity of ZnO/EG nanofluid is presented in this
research. The nanofluid was prepared by dispersing Zno nanoparticles in ethylene glycol using a
sonicator and adding surfactant. Ethylene glycol based nanofluid containing ZnO nanoparticle
with a nominal diameter of 18 nm at different solid volume fractions (very low to high) at
various temperatures was examined for the investigation. The thermal conductivity of nanofluids
is experimentally measured with THW method and it is found that the thermal conductivity of
nanofluids increase with the nanoparticle volume concentration and temperature. Also, based on
experimental values of thermal conductivity of nanofluid, three experimental models are
proposed to predict thermal conductivity of nanofluids. The proposed models show reasonably
excellent agreement with our experimental results.

Keywords

References

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History

  • Receive Date: 20 July 2013
  • Revise Date: 07 December 2013
  • Accept Date: 14 December 2013

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