Solid-solid contacts due to surface roughness and their effects on suspension behaviour.

@article{Davis2003SolidsolidCD,
  title={Solid-solid contacts due to surface roughness and their effects on suspension behaviour.},
  author={Robert H. Davis and Yu Zhao and Kevin P Galvin and Helen J. Wilson},
  journal={Philosophical transactions. Series A, Mathematical, physical, and engineering sciences},
  year={2003},
  volume={361 1806},
  pages={871-94}
}
Solid-solid contacts due to microscopic surface roughness in viscous fluids were examined by observing the translational and rotational behaviours of a suspended sphere falling past a lighter sphere or down an inclined surface. In both cases, a roll-slip behaviour was observed, with the gravitational forces balanced by not only hydrodynamic forces but also normal and tangential solid-solid contact forces. Moreover, the nominal separation between the surfaces due to microscopic surface roughness… CONTINUE READING

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