The Wear and Drag Predictions of the Micro-Asperities on Textured Wall

Abstract

This study presented a theoretical method to find approximated dimensions of the rectangular micro-asperity. The suitable values required for the asperity’s width and its critical length are found for different values of the flow speed. Numerical calculation is carried out using the solidworks flow simulation; the simulation results illustrated the flow speed trajectory, the variation of the shear stress and the flow pressure on different faces of the micro-asperities. The turbulence area due to the micro-asperity geometry is localized. The prediction of the maximum wear area, due to the skin friction, is also localized in consideration of the shear stress variation.

Influences of the Flow Speed and the Micro-Texture Deepness on the Hydrodynamic Lubrication Characteristics

“…3 A numerical simulation was done with different fluid speeds to determine the flow characteristics (shear stress, pressure) on different faces of micro-asperities; 4 a theoretical method was also used to find the approximated micro-asperities dimensions. 5 The use of textured surfaces with different shapes of micro-cavities (textures) and at different locations of the texture zone can be an effective approach to improve the performance of bearings. The texture location influence on the hydrodynamic journal bearing performance has been examined.…”

Influences of the Textured Surface Micro-Texture Depth on the Friction Coefficient

“…Predictions of the friction coefficient and the wear depth, which were obtained from a Global Incremental Wear Model "GIWM", are in good agreement with experiments and successfully validate the transferability of the model [3]. A numerical simulation was done with different fluid speeds to determine the flow characteristics (shear stress, pressure) on different faces of micro-asperities [4]; a theoretical method was also used to find the approximated micro-asperities dimensions [5].…”