Development of a texture averaged Reynolds equation

Autor: Daniel J. Rixen, R.A.J. van Ostayen, A de Kraker
Přispěvatelé: TNO Industrie en Techniek
Rok vydání: 2010
Předmět:
Engineering drawing
High Tech Systems & Materials
Surface finish
Inertia effects
Inertia
Correction terms
Lubricant films
law.invention
Physics::Fluid Dynamics
Local loads
Journal bearings
law
Bearing surfaces
Fluid dynamics
Reynolds equation
Texture (crystalline)
Micro-scales
Materials
media_common
TS - Technical Sciences
Industrial Innovation
Average Reynolds equation
Water lubricated bearings
Surfaces and Interfaces
Mechanics
Surfaces
Coatings and Films
Multiscale method
Mechanics of Materials
Surface-texturing
Unit-cell dimensions
Lubrication
Lubricant flow
Materials science
media_common.quotation_subject
Non-linear
Lubricated journal bearings
Textured surface
Surface texture
Bearing (mechanical)
Navier Stokes
MPC - Materials Performance Centre
Mechanical Engineering
Local flow conditions
Mechatronics
Mechanics & Materials
Macro scale
Flow patterns
Flowfactors
Fluid flow
Flow (mathematics)
Complex flow
Zdroj: Tribology International, 11, 43, 2100-2109
ISSN: 0301-679X
DOI: 10.1016/j.triboint.2010.06.001
Popis: The application of textured bearing surfaces results in a more complex lubricant flow pattern compared to smooth bearing surfaces. In order to capture the more complex flow pattern and possible inertia effects in the vicinity of the surface pockets, the NavierStokes equations should be used to model the flow between textured surfaces instead of the Reynolds equation. In this paper a multi-scale method is presented where the fluid flow in a single micro-scale texture unit cell is modelled using the NavierStokes equations, the results of which are then averaged to flow factors to be used in a novel texture averaged Reynolds equation on the macro-scale bearing level. Depending on the local flow conditions the non-linear inertia effects in the flow can either contribute or detract from the local load capacity of the lubricant film. Some results from the micro-scale calculations are presented, followed by the method developed to average these results to the macro-scale. The resulting flow-factors are presented and a load correction term is introduced. Although the method presented does not put restrictions to the texture dimensions, the texture unit cell dimensions are chosen equal to those in an experimental polymer water lubricated bearing. In a follow-up paper these results will be used to determine the efficiency of surface texturing in a lubricated journal bearing application. © 2010 Elsevier Ltd.
Databáze: OpenAIRE
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