Empirical correlations for thermal conductivity and dynamic viscosity of MgO-EG

Abstract

In this study, the thermal conductivity and dynamic viscosity of MgO-Ethylene Glycol nanofluid are investigated. MgO nanoparticles with three diameters of 20, 50, and 100 nm are used to prepare nanofluids. Ethylene Glycol and nanofluid with particle volume fraction of 0.25%, 0.5%, 0.75% and 1% are used as working fluid. The experiments are conducted in the temperature range of 25 to 50 °C with volume fraction up to 1%. The results have shown that thermal conductivity and dynamic viscosity increase by an increase in volume fraction and a decrease in particles’ diameter, while the temperature effect on thermal conductivity and dynamic viscosity are incremental and decremental, respectively. Moreover, the sensitivity of the thermal conductivity and dynamic viscosity to variations in key parameters such as temperature volume fraction and particles’ diameter is measured. Based on the experimental data and using multivariate linear regression method, new correlations were proposed to predict the thermal conductivity and dynamic viscosity of the nanofluid. The R-squared (R2) values of the thermal conductivity and dynamic viscosity correlations were equal to 0.984 and 0.993, respectively. The results present that these correlations have higher accuracy in predicting the thermal conductivity and dynamic viscosity of the nanofluid compared to theoretical relations and other existing empirical valid relations. Therefore, these correlations are introduced as the best relationships for predicting the thermal conductivity and dynamic viscosity properties of the experimented nanofluid.

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Abbreviations

EG:

Ethylene Glycol

MgO:

Magnesium oxide

SEM:

Scanning electron microscopy

d:

Particles’ diameter (nm)

k:

Conductive heat transfer coefficient (W m1 K1)

T:

Temperature (°C)

μ:

Dynamic viscosity (N s m−2)

φ:

Nanoparticle volume fraction

f:

Base fluid

nf:

Nanofluid

p:

Particles

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Correspondence to Mohammad Reza Assari or Ashkan Ghafouri.

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Salari, M., Assari, M.R., Ghafouri, A. et al. Empirical correlations for thermal conductivity and dynamic viscosity of MgO-EG. J Braz. Soc. Mech. Sci. Eng. 43, 111 (2021). https://doi.org/10.1007/s40430-020-02773-w

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Keywords

  • Nanofluid
  • Thermal conductivity
  • Viscosity
  • New correlations
  • Particles’ diameter