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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
TRIBOLOGICAL PERFORMANCE AND THERMAL CONDUCTIVITY OF LUBRICANT CONTAINING CuO NANOPARTICLES
Submission Author:
Breno Cavalcanti , RN
Co-Authors:
Breno Cavalcanti, Salete Alves, Cleiton Rubens Formiga Barbosa
Presenter: Breno Cavalcanti
doi://10.26678/ABCM.ENCIT2020.CIT20-0652
Abstract
Nanofluids can be described as biphasic mixtures that consists of solid nanometric sized particles dispersed in a base fluid. According to the literature, a variety of nanoparticles have been used to investigate the ability to improve the tribological and thermal properties of lubricants by many authors. This work has as main objective the synthesis of an oil-based nanofluid made from copper oxide (CuO) nanoparticles with 0.05; 0.1 and 0.2 wt% concentration dispersed in commercial polyolester synthetic oil. The samples were subjected to an ultrasonic bath for 60 minutes and their stability was verified by observing sedimentation. 6.7 ml samples of nanofluids were used to perform dynamic viscosity test under 10 to 60°C temperature range. Tribological performance was evaluated using the High Frequency Reciprocating Rig (HFRR) ball (AISI 52100) on disc (cast iron FC-200) test @50°C, obtaining values for coefficient of friction (COF), lubricating film formation and wear scar diameter (WSD) of the ball. The coefficient of thermal conductivity (k) was measured using the KD2 PRO equipment by transient line heat source method @ 25°C. In comparison with the pure base oil, there was minimal variation in the dynamic viscosity with an increasing tendency for higher concentrations of nanoparticles, reduction of up to 14.5% in WSD and 7.6% in COF as well as a small increase of up to 1.3% for k.
Keywords
Nanolubricant, tribological performance, thermal conductivity, viscosity
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