Two-Dimensional CFD-Analysis of Micro-Patterned Surfaces in Hydrodynamic Lubrication

Author:

Sahlin Fredrik1,Glavatskih Sergei B.1,Almqvist Torbjo¨rn1,Larsson Roland1

Affiliation:

1. Lulea˚ University of Technology, Division of Machine Elements Lulea˚, SE-971 87, Sweden

Abstract

Results of a numerical study of the influence of micro-patterned surfaces in hydrodynamic lubrication of two parallel walls are reported. Two types of parameterized grooves with the same order of depth as the film thickness are used on one stationary wall. The other wall is smooth and is sliding with a specified tangential velocity. Isothermal incompressible two dimensional full film fluid flow mechanics is solved using a Computational Fluid Dynamics method. It is shown that, by introducing a micro-pattern on one of two parallel walls, a net pressure rise in the fluid domain is achieved. This produces a load carrying capacity on the walls which is mainly contributed by fluid inertia. The load carrying capacity increases with Reynolds number. The load carrying capacity is reported to increase with groove width and depth. However, at a certain depth a vortex appears in the groove and near this value the maximum load carrying capacity is achieved. It is shown that the friction force decreases with deeper and wider grooves. Among all geometries studied, optimum geometry shapes in terms of hydrodynamic performance are reported.

Publisher

ASME International

Subject

Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials

Reference12 articles.

1. Snegovskii, F. P., and Bulyuk, N. G., 1983, “Study of Lubrication of Sliding Bearings With Microgrooves on the Sliding Shafts,” Trenie Iznos, 4(2), pp. 322–329.

2. Bulyuk, N. G. , 1988, “Thermal Analysis of Sliding Bearing With Micro-Channels on the Shaft Friction Surface,” Trenie Iznos, 9(5), pp. 1007–1018.

3. Ryk, G., Kligerman, Y., and Etsion, I., 2002, “Experimental Investigation of Laser Surface Texturing for Reciprocating Automotive Components,” Tribol. Trans., 45(4), pp. 444–449.

4. Glavatskih, S., McCarthy, D., and Sherrington, I., 2003, “Hydrodynamic Performance of a Thrust Bearing With Micro-Patterned Pads,” Tribol. Trans. (submitted).

5. Etsion, I., and Halperin, G., 2002, “A Laser Surface Textured Hydrostatic Mechanical Seal,” Tribol. Trans., 45(3), pp. 430–434.

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