Abstract
To enhance oil’s tribological and rheological properties, various nano-additives are used. An example of such a nano-additive is nanosized molybdenum disulfide (MoS2). Due to its unique properties, MoS2-based materials used as lubricants have attracted significant attention. In our previous work, we developed a novel, scalable, and low-cost method for MoS2-based materials production using an impinging jet reactor. Hybrid nanostructures based on MoS2 and carbon nanomaterials (MoS2/CNMs) decreased the friction factor of the base oil. In the present study, a mathematical model that accounts for the viscous heating effects in rheograms was formulated. The model was used to interpret the results of rheological measurements conducted for the base oil 10W40 and its mixtures with different nanosized lubricant additives. The model of the non-isothermal Couette flow allowed us to correct the rheograms of the engine oils in the region of high shear rates where viscous heating effects become significant. The temperature correlations for the consistency and flow behavior indexes were proposed. The nanohybrid suspensions of MoS2 in the base oil were found to have the lowest apparent viscosity at low temperatures, typical for the cold engine startup.
Highlights
Technologies such as multi-point fuel injections, economizers, or engine control units are designed to optimize engine efficiency [1,2]
In our previous work [10] we demonstrated the influence of carbon nanomaterials (CNMs) on the tribological properties of MoS2 used as an additive to 10W40 oil
We presented how the physicochemical properties of the nanomaterials influence the tribological and rheological behaviors of the modified engine oils
Summary
Technologies such as multi-point fuel injections, economizers, or engine control units are designed to optimize engine efficiency [1,2]. Ensuring optimal working conditions is important to provide a low level of engine emissions, durability of the engine, and improvement of fuel consumption [3]. Advanced engines allow for a frequent change in engine speed. This necessitates the use of an oil with improved lubricating properties. One of the approaches to enhance oil properties is to use various nano-additives. Nano-additives are more effective than conventional additives due to the lower particle sedimentation, better dispersion in oil, better contact of the lubricating parts, lower pressure drop, and the fact that they do not block the fuel pump [4,5]
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