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Thermal conductivity and viscosity measurements of ethylene glycol-based Al2O3 nanofluids


M. Pastoriza-Gallego1, L. Lugo2, J. Legido3 and M. Piñeiro4

1Física Aplicada, Facultad de Ciencias, Univesidad de Vigo, Spain

Keywords: nanofluid, thermophysical properties
property: viscosity, thermal conductivity
material: ethylene glycol, Al2O3

Following previous studies concerning thermophysical characterization of nanofluids consisting of Al2O3[1] and CuO[2] nanoparticles in water, in this case we show the results of the study of thermophysical properties of a dispersion of Al2O3 nanoparticles in ethylene glycol at several concentrations up to 25% in mass fraction. The thermal conductivity and viscosity were experimentally determined at temperatures ranging from 283.15 to 323.15 K using an apparatus based on the hot-wire method and a rotational viscometer, respectively. Measured enhancements on thermal conductivity (up to 19 %) compare well with literature values when available. New viscosity experimental data yield values twice larger than the base fluid. The influence of particle size on viscosity has been also studied, finding large differences that must be taken into account for any practical application. These experimental results were compared with some theoretical models, as those of Maxwell for thermal conductivity [3], and Krieger and Dougherty for viscosity [4].

References
  1. M. J. Pastoriza-Gallego, C. Casanova, R. Paramo. B. Barbes, J. L. Legido, M. M. Piñeiro, Journal of Applied Physics, 106, 43011-43018, (2009).

  2. M. J. Pastoriza-Gallego, C. Casanova, J. L. Legido, M. M. Piñeiro, Fluid Phase Equilibria, 300,188-196 (2011)

  3. J. C. Maxwell, A Treatise on Electricity and Magnetism, 3rd ed. (Oxford University Press, London, 1892)

  4. I. M. Krieger, T. J. Dougherty, Trans. Soc. Rheol. 3, 137 (1959)

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