PGSRET 2018

Abstract

Carbon Nanotubes (CNT) based nanofluids with their enhanced thermal conductivity are demonstrated to be a promising coolant in many heat transfer applications. Stable nanofluids were successfully produced in the lab and the stability of CNT in the presence of Gum Arabic (GA) dispersant in water is systematically investigated by taking into account the combined effect of various parameters such as sonication time, dispersant and particle concentrations. Both experimental and numerical simulations were carried out to determine the heat transfer enhancement using CNT-nanofluids. CFD simulations were carried out using ANSYS FLUENT by assuming single phase approximation. Thermal conductivity, density and rheology of the CNT-nanofluid were also measured as a function of temperature. The results indicate more than 70% enhancement in heat transfer with increase in flow rates. The lubrication properties of the CNT-nanofluids as well as water, and ethylene glycol are also investigated. The results show that the higher the concentration of nanofluid, the higher the viscosity of nanofluid. From the wear and friction test, the results elucidate the effect of CNT-nanofluid in reducing the wear loss of aluminium sample. It is found that the wear rate and wear scar diameter (WSD) decrease when the concentration of nanofluid increases. The smaller the wear scar diameter (WSD) and wear rate, the better the lubrication performance and anti-wear property of a fluid. It is found that the best lubrication properties among the CNT-nanofluid in this work is 0.1% CNT-nanofluid with wear rate of and wear scar diameter (WSD) of 2.1 mm.

CV : Download