Clean Technology 2010

Influence of Nanoparticles Dispersion on Viscosity of POE Oil Based Nanofluids

S. Bobbo, L. Fedele, A. Benetti, L. Colla, S. Barison, M. Fabrizio
Consiglio Nazionale delle Ricerche, IT

Keywords: nanofluids, single wall carbon nanohorns, titanium dioxide, viscosity


In the refrigeration field, nanotechnologies can give new opportunities in the selection of the proper working fluids. In particular, the dispersion of nanoparticles in oils promises to improve their characteristics, offering a good opportunity in the selection of the most suitable lubricant for a given application. Following our study on the influence of nanoparticles on solubility of refrigerants in commercial oils and on their tribological properties, here experimental viscosity data are presented at atmospheric pressure and in a temperature range between 283.15 K and 323.15 K, for nanofluids formed by a commercial polyolester (POE) oil, as the base fluid, and nanoparticles of two different materials, i.e. single wall carbon nanohorns (SWCNH) or titanium dioxide (TiO2). Viscosity was measured by means of an AR-2 rheometer supplied by TA Instruments, as a function of the nanoparticles mass fraction and the shear rate, thus allowing the description of the possible non-Newtonian behaviour for the nanofluid. Moreover, the stability of the nanofluids was also studied with a Malvern Zetasizer, enabling the analysis of the size distribution of the nanoparticles in the nanofluid and the evaluation of possible aggregations and change in distribution along the time.
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