Abstract
The slip boundary has an important influence on hydrodynamic journal bearing. However, less attention has been paid to the positive effect of slip on thermal behaviour. In this study, a computational fluid dynamics (CFD) analysis investigating the thermo-hydrodynamic (THD) characteristics of heterogeneous slip/no-slip bearings running under steady, incompressible, and turbulent conditions is presented. A comprehensive analysis is made to investigate the THD behaviours of heterogeneous slip/no-slip bearings in terms of lubricant pressure, temperature distribution, volume fraction of vapor, and load-carrying capacity when they are running under different shaft rotational speeds. The multiphase cavitation model is adopted to represent the real operational condition of the journal bearing. Numerical results show that the load-carrying capacity of the heterogeneous slip/no-slip bearing can be significantly increased by up to 100% depending on the rotational speed. It is also observed that there is an optimal journal rotational speed for maximizing the load-carrying capacity. An insightful new finding is revealed in a numerical framework, wherein it is found that by introducing the heterogeneous slip/no-slip pattern, the maximum temperature can be reduced by up to 25% in comparison with a conventional bearing.
Highlights
The simulation results of 3D computational fluid dynamics (CFD)-based thermo-hydro-dynamic analysis for the journal bearing with heterogeneous slip/no-slip patterns are presented
In order to prove that the CFD method and its solution setup can be employed for thermo-hydro-dynamic (THD) analysis of the journal bearing, it must be shown that the results are correct and with specified accuracy
For high rotational speed (n = 5000 rpm in this case), the discrepancy in the load-carrying capacity predicted by the heterogeneous slip/no-slip pattern is around 20% higher than that produced by the conventional bearing
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Such an assumption contradicts a recent study that revealed that the viscosity wedge effect due to temperature difference across the film thickness has a strong role in increasing the load support [33] This makes the thermal boundary condition important to consider in the analysis of hydrodynamically lubricated contact. The contribution of this paper is to numerically study the characteristics of the heterogeneous slip/no-slip journal bearing concerning thermal, and cavitation behaviour, as well as its tribological performance, using a combined solution of Navier–Stokes and vapor transport equations In this way, the continuity of multiphase flow, mass and momentum continuity analysis can be achieved
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