s40544-015-0098-y.pdf (1.11 MB)
Load carrying capacity of a heterogeneous surface bearing
journal contribution
posted on 2023-06-21, 06:02 authored by Evan ThomasEvan Thomas, Mircea D Pascovici, Romeo GlovneaRomeo GlovneaIt has been shown before that liquids can slip at a solid boundary, which prompted the idea that parallel-surfaces bearings can be achieved just by alternating slip and non-slip regions in the direction of fluid flow. The amount of slip at the wall depends on the surface tension at the liquid–solid interface, which in turn depends on the chemical state of the surface and its roughness. In the present study a heterogeneous surface was obtained by coating half of a circular glass disc with a coating repellant to glycerol. A rotating glass disc was placed at a known/calibrated distance and the gap was filled with glycerol. With the mobile surface moving from the direction of slip to non-slip region it can be theoretically shown that a pressure build up can be achieved. The pressure gradient in the two regions is constant, similar to that in a Rayleigh step bearing, with the maximum pressure at the separation line. The heterogeneous disc was placed on a holder supported by a load cell thus the force generated by this pressure increase can be measured accurately. Tests were carried out at different sliding speeds and gaps and the load carried was measured and subsequently compared with theoretical calculations. This allowed the slip coefficient to be evaluated.
History
Publication status
- Published
File Version
- Published version
Journal
FrictionISSN
2223-7704Publisher
SpringerOpen and Tsinghua University PressExternal DOI
Issue
4Volume
3Page range
287-293Department affiliated with
- Engineering and Design Publications
Research groups affiliated with
- Dynamics, Control and Vehicle Research Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2017-07-21First Open Access (FOA) Date
2017-07-21First Compliant Deposit (FCD) Date
2017-07-21Usage metrics
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