Análise da condutividade térmica e da viscosidade dinâmica para distintos nanofluidos a base de óleo

Abstract

In this work the measurement and characterization of the thermal conductivity and the dynamic viscosity were performed for various percentages of nanoparticle concentrations dispersed in oil. Four varieties of nanoparticles with different mass concentrations dispersed in the same base fluid were used, these being: TiO2 (0,1; 0,5 and 1%), ZrO2 (0,1; 0,5 and 1%), Ag (0,06; 0,12 and 0,59%) and MWCNT (0,01; 0,02 and 0,12%).The study was carried out with the objective of analyzing the variation of the thermodynamic properties of the thermal oil (LUBRAX UTILITE grade ISO 100) without the dispersion of the nanoparticles compared to the nanofluids. For the thermal conductivity study the test temperature has ranged from 10 at 10°C in the interval of 10-60°C, while for the acquisition of the dynamic viscosity data, the temperatures tested were 20, 40, 60 and 80°C. Regarding the results it was possible to note significant increases in the thermal conductivity of MWCNT nanofluids, reaching approximately 18%. In addition to the dynamic viscosity of the nanofluids, compared to pure oil, it has remained very close to most test conditions, with the largest increase of 1,7% for MWCNT nanofluid at its maximum concentration.