Abstract.
We derive approximate mean field equations for the fluid flow between elastic solids with randomly rough surfaces including interfacial fluid slip and shear thinning. We present numerical results for the fluid flow and friction factors for realistic systems, in particular, we consider the case of an elastic cylinder with random surface roughness in relative sliding contact with a flat rigid (low-energy) counter-surface. We present experimental data for the sliding friction between rubber stoppers and glass barrels lubricated with baked-on silicone oil. We find that the frictional shear stress acting in the rubber asperity contact regions is nearly velocity independent for velocities in the 10-1000μm/s range, and very small \( \tau_{{\rm f}} \approx 0.04\) MPa, while for bare glass in silicone oil \( \tau_{{\rm f}}\) is much larger and velocity dependent.
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Rotella, C., Persson, B.N.J., Scaraggi, M. et al. Lubricated sliding friction: Role of interfacial fluid slip and surface roughness. Eur. Phys. J. E 43, 9 (2020). https://doi.org/10.1140/epje/i2020-11933-4
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DOI: https://doi.org/10.1140/epje/i2020-11933-4