Study of static characteristics of ferrofluid lubricated rough journal bearing with elastic liner under anisotropic slip condition

Abstract

Ferrofluid lubricated circular journal bearings are opted for due to their capability to sustain heavy loads in high-speed rotating machinery. In this study, the synergistic impact of axial and circumferential slip on the characteristics of ferrofluid-lubricated rough deformable journal bearings is examined. The impact of slip on the shaft and housing liner is studied individually and simultaneously. To analyse the flow dynamics of a concentrated ferrofluid suspension, the Shliomis flow and Brinkman’s relative viscosity models are used. Various static characteristics such as load capacity, attitude angle, friction coefficient, and side leakage are computed and analysed for different volume fractions, slip configurations, magnetic field strength, elasticity coefficient, and roughness peak height. The results indicate that compared to the no-slip condition, circumferential slip on the bearing surface contributes to a decrease in both the side leakage and friction coefficient; however, the axial slip increases the friction coefficient and side leakage. The rise in volume fraction of magnetic nanoparticles and magnetic field intensity increases the load capacity and attitude angle. Furthermore, high volume fraction, higher elasticity coefficient, and reduced surface asperities height mitigate the negative impact of high slip length. The results for load carrying capacity have been compared with the established experimental and theoretical data for various geometric and operating parameters. The present results are found closer to the experimental data than the earlier theoretical results.