Investigation of nanoparticle additive impacts on thermohydrodynamic characteristics of journal bearings

Abstract

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.

Effects of Nanoparticle Enhanced Lubricant Films in Thermal Design of Plain Journal Bearings at High Reynolds Numbers

“…As can be seen in the abovementioned articles, there has been numerous studies in literature to improve the performance and design of journal bearings by investigating the effect of different parameters [13]. In particular, the effect of additive nanoparticles is one of main research directions [14]. Nanofluids have recently received much attention due to numerous reports on the dramatic increase in thermal properties [15].…”

Performance of nano-bio-lubricants, ISO VG46 oil and its blend with Jatropha oil in statically loaded hydrodynamic plain journal bearing

“…Their experimental finding revealed that nano CuO-based bio-lubricant exhibited outstanding wear and friction reduction behavior compared to synthetic lubricants as well as other nano-based bio-lubricants. Solghar 8 theoretically investigated the thermo-hydrodynamic characteristics of journal bearings using pure oil and pure oil blended with Al 2 O 3 nanoparticles and presented various results such as side leakage, load-carrying capacity, friction coefficient, temperature and pressure distributions. It was found that the lubricant with nano-additives increases both the load-carrying capacity and the friction coefficient and decreases the flow rate compared to the pure oil.…”

Multiple-relaxation-time lattice Boltzmann method of hydrodynamic lubrication in lemon-bore bearing

“…Also, in order to assess the impacts of turbulent conditions on the bearing THD performance, a modified low-Re k–ε turbulence model was used. 11–18…”

“…[5][6][7] Moreover, the heat transfer in the grooves was modeled in their studies. Most recently, Arab Solghar et al [8][9][10][11][12][13][14][15][16][17][18] have extensively investigated the THD performance of journal bearings for both laminar and turbulent flow in the bearing. They experimentally examined the THD behavior of a twin groove journal bearing under variable load angle.…”

“…In another work carried out by Arab Solghar et al, 9 it was found that by the deactivation of a groove located in the pressure buildup zone, the undesirable effects of hot lubricant return is mitigated. In the numerical studies conducted by Arab Solghar et al, 8,[11][12][13][14][15][16][17][18] the THD characteristics of the journal bearings were examined in both the laminar and turbulent regime through using the computational fluid dynamics (CFD) approach. Their model was based on simultaneous solution of the momentum equation of the fluid flow coupled with the energy equation.…”