Abstract
The thermomechanical properties of a fluid can be improved by adding nanoparticles to the liquid media. This field of nanotechnology has derived in multiple applications extending from material science to the electronic, mechanical and healthcare sector. The viscosity and thermal conductivity of fumed nanosilica/PPG400 suspensions was studied. Related to viscosity measurements, this system showed shear-thickening behavior between two shear-thinning regions. An apparent viscosity function for shear-thickening fluids [J Non-Newtonian Fluid Mech 166 (2011) 321–25; 166 (2011) 1421–1424] was fitted to the experimental data. The dependence on temperature and solid volume fraction of the model parameters was studied. It was obtained that the shear-thickening effect was less pronounced with the increase of temperature and the decrease of solid concentration. In contrast, solid concentration exerted more influence on thermal conductivity than temperature. The nearly negligible independence of thermal conductivity with temperature, high specific capacity, together with low viscosity at rest, even at high particle concentration, makes this system very suitable for some industrial applications in which slow changes of temperature are required.
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