Analytical and numerical validation of a plate-plate tribometer for measuring wall slip
arxiv(2023)
摘要
We model the Darmstadt Slip Length Tribometer (DSLT), specially designed to
measure viscosity and slip length simultaneously for lubrication gaps in the
range of approximately 10 micrometres at relevant temperatures and surface
roughness. We investigate the inlet effect of the flow on the results by
varying the inner radius of the fluid inlet pipe. The outcomes of numerical
simulations suggest that variations in the diameter of this inner radius have
minimal impact on the results. Specifically, any alterations in the velocity
profile near the inlet, brought about by changes in the diameter, quickly
revert to the profile predicted by the analytical model. The main conclusion
drawn from this study is the validation of the Navier-Slip boundary condition
as an effective model for technical surface roughness in CFD simulations and
the negligible influence of the inlet effect on the fluid dynamics between the
tribometer's plates.
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