In this study, the tribological behavior of macro-grooved textures were studied using a cylinder-on-plate contact config uration (line contact) under lubrication condition. The effects of actual contact line length and groove distribution on the coefficient of friction (CoF) were investigated. The experimental results exhibited a reduction in the CoF for all of the textured samples. An increase in the number of grooves resulted into a reduction in CoF. At a sliding speed of 10mm/s, the CoF of the textured sample with four grooves reaches a minimum value of 0.15. Compared with the smooth one, the decreasing amplitude was 7.7%. While for the same total contact length, the more dispersed groove distribution may also lead to the more remarkable friction reduction. Simulation analysis revealed that the primary mechanism for friction reduction was the improved oil supply at the contact line, coupled with a decrease in the shear stress exerted by the fluid domain on the surface. An increase in groove number results in a rise in contact stress, whereas the effect of groove distribution is insignificant.

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