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We model the Darmstadt Slip Length Tribometer (DSLT), specially designed tomeasure viscosity and slip length simultaneously for lubrication gaps in therange of approximately 10 micrometres at relevant temperatures and surfaceroughness. We investigate the inlet effect of the flow on the results byvarying the inner radius of the fluid inlet pipe. The outcomes of numericalsimulations suggest that variations in the diameter of this inner radius haveminimal impact on the results. Specifically, any alterations in the velocityprofile near the inlet, brought about by changes in the diameter, quicklyrevert to the profile predicted by the analytical model. The main conclusiondrawn from this study is the validation of the Navier-Slip boundary conditionas an effective model for technical surface roughness in CFD simulations andthe negligible influence of the inlet effect on the fluid dynamics between thetribometer's plates.

Analytical and numerical validation of a plate-plate tribometer for measuring wall slip