Bearings are designed to support the loads normally applied to the shaft, while allowing relative movement between two machine elements. Journal or sliding bearings are perhaps the most well-known sorts of hydrodynamic bearings. The journal bearings contain no rolling elements and these bearings’ design and construction are simple, but their operation and theory are complex. Due to this and other advantages, journal bearings are much preferred in engineering applications. Simultaneously, the associated research and development have resulted in reasonable progress and therefore, a thorough review of these is earnestly felt. The static and dynamic characteristics of hydrodynamic journal bearings mainly depend on the lubricant viscosity and other factors such as load, speed, friction, and eccentricity. The review analysis focused on nanofluid lubricated hydrodynamic journal bearings are one of the rare topics of interest among tribologists. The use of a nanofluid as a lubricant is very important as it significantly improves the performance characteristics of the investigated bearing. The aggregation of nanoparticles in lubricants available commercially can cause a sharp increase in pressure drop and significantly improve the lubricant viscosity, which leads to an increase in load-carrying capacity. The tribological properties of various lubricants/base oils can be augmented by nanoparticles containing the lubricant. Studies have shown that compared to other conventional engine oils the load-carrying capacity is increased with nanoparticles containing the lubricant.
In this paper the problem of a 3 lobe bearing was selected which had the lobes placed at a distance of 120 degrees for transient CFD analysis. The rotation speed of the shaft was considered to be 60000 rpm. The results show that the presence of lobes highly affect the performance of the multi lobe bearing as the critical quantities developed here are comparatively lesser to the other zones in the bearing. The unsteady analysis was carried with help of Ansys Fluent software. In this study , six time steps of 10, 30, 50, 70, 90 and 100 seconds are taken respectively. After 100 seconds the unsteady condition becomes steady. After 100 seconds the maximum values of static pressure, total pressure, static temperature and total temperature are 7.68e+06 Pascal, 440 K are respectively and becomes steady. The study concludes that at high rotational speeds, lobes must be given in bearings to have a good life span of the bearing.
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