Abstract
In this paper, the contribution of dispersed graphene nanoparticles in graphene-gear oil nanolubricant has been analyzed. Synthesis of nanolubricant has been performed using the two-step method. The nanoparticles have been dispersed in the range of 0.03–1.8% by volume in industrial gear oil (SAE EP90). Viscosity and density of nanolubricant are measured by using Stabinger viscometer (SVM 3000, M/S Anton-Paar). Rheological properties have been experimentally tested in the temperature range of 20–80 °C, and the results have been compared with theoretically available models in open literature. The performance characteristics of nanolubricants in hydrodynamic lubrication regime have been evaluated by considering the standard Reynolds equation. For this purpose, the geometry of an infinite Rayleigh step slider bearing (one dimension) is considered with defined boundary conditions. Finite difference method (FDM) is used to obtain the solution of boundary value problem. Results confirm that the dispersion of graphene nanoparticles in gear oil enhances the performance of lubrication.
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