Investigation of nanoparticle additive impacts on thermohydrodynamic characteristics of journal bearings

Thermohydrodynamic behaviors of single-groove journal bearing are assessed operating under steady-state loading. The set of governing equations including continuity, momentum, and energy within the lubricant and energy within the solid bush are simultaneously solved employing the finite volume scheme. The analysis takes into account the cavitation effects and the mixing of the lubricant recirculation. In the present study, the performance of the journal bearing is obtained for two types of lubricant: pure oil and base oil blended with Al2O3 nanoparticles. The results are presented for the side leakage, the load-carrying capacity, the friction coefficient, and the temperature and the pressure distributions. The present formulation and method of solution are validated by comparing the results, in the limit cases, with reputable results available in the literature. Acceptable agreement between the obtained and available results is observed. It was found that the lubricant with nanoadditives increase both the load-carrying capacity (17.7% at eccentricity 0.9) and the friction coefficient and decrease the flow rate compared to the pure oil.

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