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RESEARCH PAPERS

Thermohydrodynamic Behavior of a Slider Pocket Bearing

[+] Author and Article Information
Mihai B. Dobrica, Michel Fillon

Solid Mechanics Laboratory, University of Poitiers, U.M.R C.N.R.S. 6610, SP2MI, Bd. Pierre et Marie Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France

J. Tribol 128(2), 312-318 (Sep 27, 2005) (7 pages) doi:10.1115/1.2162914 History: Received April 29, 2005; Revised September 27, 2005

Pocket-pads or steps are often used in journal bearing design, allowing improvement of the latter’s dynamic behavior. Similar “discontinuous” geometries are used in designing thrust bearing pads. A literature review shows that, to date, only isoviscous and adiabatic studies of such geometries have been performed. The present paper addresses this gap, proposing a complete thermohydrodynamic (THD) steady model, adapted to three-dimensional (3D) discontinuous geometries. The model is applied to the well-known geometry of a slider pocket bearing, operating with an incompressible viscous lubricant. A model based on the generalized Reynolds equation, with concentrated inertia effects, is used to determine the 2D pressure distribution. On this basis, a 3D field of velocities is constructed which, in turn, allows the resolution of the 3D energy equation. Using a variable-size grid improves the accuracy in the discontinuity region, allowing an evaluation of the magnitude of error induced by Reynolds assumptions. The equations are solved using the finite volume method. This ensures good convergence even when a significant reverse flow is present. Heat evacuation through the pad is taken into account by solving the Laplace equation with convective boundary conditions that are realistic. The runner’s temperature, assumed constant, is determined by imposing a zero value for the global heat flux balance. The constructed model gives the pressure distribution and velocity fields in the fluid, as well as the temperature distribution across the fluid and solid pad. Results show important transversal temperature gradients in the fluid, especially in the areas of minimal film thickness. This further justifies the use of a complete THD model such as the one employed.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Slider pocket bearing geometry

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Figure 2

3D staggered control volume

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Figure 3

2D cuts through the 3D energy grid

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Figure 4

Numerical algorithm

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Figure 5

Grid convergence analysis

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Figure 6

W dependence on pocket size (kN)

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Figure 7

Tmax dependence on pocket size (°C)

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Figure 8

Pressure field (small pocket) (MPa)

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Figure 10

T in the pad, at the interface (y=h)

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Figure 11

T in the transversal (x,y) plane at z=B∕2

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Figure 12

T in the transversal (z,y) plane at x=L∕2

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Figure 13

Velocity u in the transversal (x,y) plane

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Figure 14

Pressure field in the plane-inclined bearing

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