Inertia Effects in an Externally Pressurized Thrust Bearing Using Herschel - Bulkley Lubricants
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In this paper, the combined effects of fluid inertia and viscous forces have been investigated theoretically in an externally pressurized thrust bearing with circular ge- ometry using Herschel-Bulkley fluid as lubricant.Abstract:
The combined effects of fluid inertia and viscous forces of a Herschel-Bulkley lubricant in an externally pressurized thrust bearing with circular geometry have been analyzed theoretically. Although the researchers of the past, laid out a foundation for the hydrodynamic lubrication, modern researchers intend to use non-Newtonian fluids characterized by a yield-value, such as Bingham, Casson and Herschel-Bulkley fluids as lubricants. More over, Tribologists emphasize a fact that in order to analyze the performance of the bearings adequately, it is necessary to consider the combined effects of fluid inertia and viscous forces of non-Newtonian lubricants. Therefore, in this research article, the combined effects of fluid inertia and viscous forces have been investigated theoretically in an externally pressurized thrust bearing with circular ge- ometry using Herschel-Bulkley fluid as lubricant. The shape and extent of the core, along the radius, have been determined numerically for various values of the Herschel-Bulkley number and the power-law index. Using the appropriate boundary conditions, the velocity distributions in the flow and the core regions have been obtained. By considering the equilibrium of an element of the core in the fluid, the modified pressure gradient has been evaluated and thereby the film pressure and the load capacity of the bearing have been obtained numerically for different values of Reynolds number, Herschel-Bulkley number and power-law index. The effects of the inertia forces and the non-Newtonian characteristics of the lubricant, on the bearing performances have also been discussed.read more
Citations
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Journal Article
Dynamic characteristics of magnetorheological fluid lubricated journal bearing and its application to rotor vibration control
TL;DR: In this article, the stiffness and damping coefficients of the journal bearing of a turbo-expander rotor with different bearing properties are calculated using the Herschel-Bulkley model to describe the rheological behavior of magnetorheological fluid.
References
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Journal ArticleDOI
CFD analysis of journal bearing hydrodynamic lubrication by Bingham lubricant
TL;DR: In this paper, the performance characteristics of a hydrodynamically lubricated journal bearing with a Bingham fluid are derived by means of three-dimensional computational fluid dynamics (3-D CFD) analysis.
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Use of the parallel-plate plastometer for the characterisation of viscous fluids with a yield stress
G.H. Covey,B.R. Stanmore +1 more
TL;DR: In this article, the authors report the results of theoretical and experimental investigations into the behavior in the instrument of some inelastic incompressible fluids, such as Bingham and Herschel−Bulkley fluids.
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An experimental and theoretical study of the squeeze-film deformation and flow of elastoplastic fluids
TL;DR: In this article, the authors examined the lubrication theory in more detail by a comparison with equilibrium stress analysis for rigid-plastic solids, and the results were consistent with the theory, suggesting that it is a useful first approximation.
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