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Abstract
The lubrication of area-distributed isotropic rough surfaces is studied by a Monte Carlo method. Small square elements of isotropically rough bearing surfaces are considered. Inside such an element, the film height values have a prescribed probability density distribution, but are generated in a random sequence. Mean unit flow and friction in the elements are determined by applying Reynolds' and solving it numerically by a finite-difference technique.
The boundary conditions are provided by generating typical pressures along the elements edges.
Accuracy in the computations is ensured by describing each basic valley-ridge trace by a minimum of 16 point values.
The results demonstrate that isotropic roughness enhances pressure flow (compared with smooth bearings of the same nominal profile). A rough moving surface enhances shear flow while stationary roughness reduces it. However, quantitatively the results deviate from all current theories, including the one previously put forward by the author. The findings of the present analysis are readily expressible in a modified Reynolds' equation.
Presented at the 34th Annual Meeting in St. Louis, Missouri, April 30-May3, 1979
Notes
Presented at the 34th Annual Meeting in St. Louis, Missouri, April 30-May3, 1979