A Comparative study on Ferro-fluid Lubricated Porous Journal Bearing

Abstract

This research considered hydrodynamic theory on ferro-fluid flow models such as R. E. Rosensweig model and Jenkins model for axially undefined journal bearing with porous attached at the inner surface (i.e. on the journal). In this study, the variable external magnetic field is assumed. The expressions of (non-dimensional) pressure and load-carrying capacity are obtained. The values of load capacity for both models are calculated for various parameters like porous thickness, slip velocity, squeeze velocity, permeability, and eccentricity. Also, calculated load capacity by cons idering porous structure models like the globular sphere model and capillary fissures model. Based on the obtained results, the globular sphere model gives much better performance for load capacity rather than the capillary fissures model. From the study, it is suggested that to design the journal bearing, globular sphere model of porous structure should be preferred over the capillary fissures model. Also, for the better performance of the journal bearing, the choice of fluid-flow model depends on the values of parameters.