نوع مقاله : مقاله مکانیک
نویسندگان
1 دانشکده فنی و مهندسی، دانشگاه دامغان، دامغان، ایران
2 دانشکده مهندسی مکانیک، دانشگاه سمنان، سمنان، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
This paper investigates the rheological and tribological behavior of motor oil containing silica-aerogel nanoparticles at different concentrations and temperatures. The nanoparticles were suspended in SAE20W50 base oil at concentrations of 0.28, 1.4, 2.8, and 5.5wt% and tested at different temperatures. The friction and wear tests were carried out by a pin on disk device according to ASTM G99 standard. The dynamic viscosity measured by the Brookfield CAP 2000+ viscometer. The power-law index obtained for all concentrations showed that the fluid has non-Newtonian shear thinning behavior. The results of the wear measurements showed that the nanofluid with a concentration of 5.5wt% at 25 °C decreased the friction coefficient by 22.39%. At the same temperature the friction coefficient, 19.40 % reduced by the concentration of 2.8 wt% respect to the base oil. At this temperature, the wear rate also decreased for concentrations of 5.5wt% and 2.8wt%, 61.1%, and 50%, respectively. By selecting the concentration of 2.8wt% as the optimal concentration, the experiments were resumed at temperatures of 100 and 200 °C with this concentration. The results showed that at 100 °C and with optimum concentration, the friction coefficient decreased by 25.80%, and the wear rate by 51.36% compared to the base oil.
کلیدواژهها [English]
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