Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Experimental investigation of thermal conductivity and viscosity of insulating oil based Diamond-Nickel hybrid nanofluids
Submission Author:
Letícia Oliveira , MG
Co-Authors:
Letícia Oliveira
Presenter: Letícia Oliveira
doi://10.26678/ABCM.COBEM2017.COB17-2787
Abstract
Due to the effect of the nanoparticles on the thermo-physical properties of the base fluid, a kind of hybrid diamond-nickel (Di-Ni) nanoparticle was dispersed in insulating mineral oil in order to produce nanofluids at three different concentrations, up to 0.05 vol%. The sedimentation test was conducted and the nanofluids remained stable for approximately one week; after that period, a gradual sedimentation was observed with the time. Two important thermo-physical properties such as the thermal conductivity and the viscosity were measured under the same conditions, and the experimental results showed that the thermal conductivity of Di-Ni nanofluids increased with the volumetric concentration and temperature. The breakdown voltage, another important property of insulating oils, was also evaluated. Adding hybrid Di-Ni nanoparticles to the insulating mineral oil is helpful to enhance the heat transfer, due to the slightly higher thermal conductivity.
Keywords
Nanofluids, dielectric strength, Hybrid, insulating mineral oil
