Performance characteristics of journal bearings (porous type): A coupled solution using Hartmann number and roughness parameter. (May 2020)

• Record Type: Journal Article
• Authors: Kalavathi, GK; Najar, FA; Vasundhara, MG
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 234:Number 5(2020:May)
• Page Start: 668
• Page End: 675
• Publication Date: 2020-05
• Subjects: Heterogeneous surface -- journal bearing -- magnetic levitation -- surface roughness; Tribology -- Periodicals; 621.89
• DOI: 10.1177/1350650119886709
• Languages: English
• ISSNs: 1350-6501

Abstract

The influence of magnetic field and roughness factor on long journal (porous) bearing with heterogeneous slip/no-slip surface has been described in this paper. Assumptions of hydrodynamic lubrication theory and Navier slip relation were employed during the investigation, and the generalized Reynolds equation for the oil film pressure was obtained using appropriate boundary conditions and the expressions for pressure distribution and load-carrying capacity as a function of Hartmann number, permeability parameter, roughness parameter, and slip parameter were derived in integral forms. Integrals involved are evaluated by using Simpsons 1/3rd rule and Gauss quadrature 16-point formula in MATLAB code. Christensen stochastic process is adopted to study the roughness behavior. In the present analysis, it has been revealed that there is a noticeable escalation in the load-carrying capacity with the embodiment of magnetic field effect, which enables the journal (rotating part) to levitate inside the domain of bearing (stationary part) that indeed supports the lubricant performance.