Elasto-hydrodynamic analysis of journal bearing operating with nanolubricants

Abstract

In this study, performance parameters of a rigid and flexible journal bearing using non-Newtonian nanolubricants have been investigated and compared. Krieger-Dougherty viscosity model has been implemented with a non-Newtonian model (power law) to evaluate the effective viscosity of nanolubricants. In order to attain the pressure field of nanolubricants, a numerical solution of the modified Reynolds equation has been derived with initial assumptions and boundary conditions using finite difference method. The static performance parameters for both the bearings have been examined at different values of power law index and eccentricity ratio. The results demonstrate that the load-carrying capacity, maximum pressure and friction force increase significantly using nanolubricant in comparison to base lubricant. Also, the values of these parameters increase with increase of power law index. An insignificant effect of elastic deformation is observed on performance parameters except attitude angle at a particular power law index value.

Experimental analysis of the efficacy of vegetable oil-based nanolubricants for improving journal-bearing performance

“…This is due to the fact that the viscosity of the base lubricant increases with the addition of nanoparticles; consequently, the fluid film pressure increases. This result is supported by the study of Khan et al, 39 in which the generated maximum pressure within the lubricant film is highly influenced by the particle concentration, where the lubricant film pressure increased with an increase in the particle concentration. An appreciable increase in the hydrodynamic pressure is observed for the volume fraction of 0.02% in comparison with other volume fractions.…”

Effect of TiO2 and CuO Based Nanolubricants on the Static Thermal Performance of Circular Journal Bearings

“…Nanoparticle weight concentration has been converted to volume fraction of nanoparticles using the relationship given by Azmi et al [36] as given in Eq. (8).…”

“…With the advent of nanotechnology, nanoparticles have been explored as lubricant additives for overcoming the drawbacks of traditional antifriction/ antiwear additives [6]- [8]. Due to their small size, nanoparticles are capable of filling the small spaces between matching surfaces and impart special characteristics to the surfaces.…”

“…There was a maximum improvement in the static and dynamic performance of elliptical bearing operated with nanolubricant. Khan et al [8] studied the journal bearing performance by using nanolubricants and adopting power law model at different power index values and also considering the influence of liner deformation. Load capacity and friction force were found to be increased with the increase in nanoparticle concentration for rigid as well as flexible bearings.…”

Dispersion stability and rheology study of canola oil containing TiO2nanoadditives for tribological applications: An experimental approach

“…Various authors have also evaluated the performance parameters of journal bearing theoretically operating under nano oil. 13–17 Their results revealed that the oil containing nanoparticles significantly intensifies the bearing’s load capacity. The above-discussed studies clearly show that the adding of nanoadditives in base fluid improves the tribological characteristics of base fluid considerably to a great extent.…”