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RESEARCH PAPERS

Some Remarks on the Validity of Reynolds Equation in the Modeling of Lubricant Film Flows on the Surface Roughness Scale

[+] Author and Article Information
T. Almqvist, R. Larsson

Division of Machine Elements, Luleå University of Technology, SE-971 87 Luleå, Sweden

J. Tribol 126(4), 703-710 (Nov 09, 2004) (8 pages) doi:10.1115/1.1760554 History: Received July 01, 2003; Revised March 25, 2004; Online November 09, 2004
Copyright © 2004 by ASME
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References

Figures

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The denominator in the modified momentum equations for Newtonian (-) and Eyring (--) rheological models. The pressure is denoted beside the curves.
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Pressure distribution for the two approaches when a Newtonian rheology is used. The CFD-solution denoted by (-) and the Reynolds solution by (* ), ω=2.5×10−3.
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The CFD-solution (-) compared with the Reynolds equation solution (--) when the singularity influences the solution. The rheology is assumed to be Newtonian, ω=2.5×10−3.
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The CFD and Reynolds equation solution for an Eyring rheological model, ω=2.5×10−3
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The denominator in the modified momentum equations for a Newtonian (-) and an Eyring (--) rheological model. The Eyring stress τ0 is denoted beside the curves.
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The ratio of the maximum deviation between the CFD and Reynolds equation and the maximum pressure. In the figure, three different ratios yr/h are shown versus ω.
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The deviation in pressure between the CFD and Reynolds equation approaches versus ω. The ratio yr/h is held to a constant value yr/h=0.1.
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The ratio of the maximum pressure difference across the fluid film and the maximum pressure along a trace in the middle of the film in the CFD-computations. In the figure, three different ratios yr/h are shown versus ω.

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