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

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...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part J, Journal of engineering tribology Journal of engineering tribology, 2020-05, Vol.234 (5), p.668-675
Main Authors: Kalavathi, GK, Najar, FA, Vasundhara, MG
Format: Article
Language:English
Subjects:
Bearing strength
Boundary conditions
Hartmann number
Integrals
Journal bearings
Load carrying capacity
Lubricants
Lubricants & lubrication
Magnetic fields
Magnetic permeability
Mechanical engineering
Parameters
Pressure distribution
Quadratures
Reynolds equation
Roughness
Slip
Stochastic processes
Stress concentration
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Summary: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.
ISSN:1350-6501
2041-305X
DOI:10.1177/1350650119886709