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.

Copyright © 2006 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

Slider pocket bearing geometry

Grahic Jump Location
Figure 2

3D staggered control volume

Grahic Jump Location
Figure 3

2D cuts through the 3D energy grid

Grahic Jump Location
Figure 4

Numerical algorithm

Grahic Jump Location
Figure 5

Grid convergence analysis

Grahic Jump Location
Figure 6

W dependence on pocket size (kN)

Grahic Jump Location
Figure 7

Tmax dependence on pocket size (°C)

Grahic Jump Location
Figure 8

Pressure field (small pocket) (MPa)

Grahic Jump Location
Figure 10

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

Grahic Jump Location
Figure 11

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

Grahic Jump Location
Figure 12

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

Grahic Jump Location
Figure 13

Velocity u in the transversal (x,y) plane

Grahic Jump Location
Figure 14

Pressure field in the plane-inclined bearing



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In