ViscositE, densitE et conductivitE thermique de nanolubrifiants d'oxyde d'aluminium et d'oxyde de zinc
Viscosity, density, and thermal conductivity of aluminum oxide and zinc oxide nanolubricants
Abstract This paper presents liquid kinematic viscosity, density, and thermal conductivity measurements of eleven different synthetic polyolester-based nanoparticle nanolubricants (dispersions) at atmospheric pressure over the temperature range 288 K to 318 K. Aluminum oxide (Al 2 O 3 ) and zinc oxide (ZnO) nanoparticles with nominal diameters of 127 nm and 135 nm, respectively, were investigated. A good dispersion of the spherical and non-spherical nanoparticles in the lubricant was maintained with a surfactant. Viscosity, density, and thermal conductivity measurements were made for the neat lubricant along with eleven nanolubricants with differing nanoparticle and surfactant mass fractions. Existing models were used to predict kinematic viscosity (±20%), thermal conductivity (±1%), and specific volume (±6%) of the nanolubricant as a function of temperature, nanoparticle mass fraction, surfactant mass fraction, and nanoparticle diameter. The liquid viscosity, density and thermal conductivity were shown to increase with respect to increasing nanoparticle mass fraction. Highlights Viscosity, density, and thermal conductivity measurements of nanolubricant for water chillers were presented. Models capture the effects of nanoparticle size, nanoparticle and surfactant mass fraction, and temperature. Viscosity model based on using nanoparticle size dependent pseudo surfactant and pseudo nanoparticle viscosities. Maxwell equation modeled spherical nanoparticles conductivity; sphericity correction for non-spherical nanoparticles.
Colloidal suspension . Density . Lubricant . Thermal conductivity . Viscosity . Water chiller . Suspension colloïdale . Densité . Lubrifiant . Conductivité thermique . Viscosité . Refroidisseur d'eau.
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