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Slipping domains in water-lubricated microsystems for improved load support

 
: Savio, D.; Falk, K.; Moseler, M.

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Tribology international 120 (2018), pp.269-279
ISSN: 0301-679X
English
Journal Article
Fraunhofer IWM ()
hydrodynamic flow; hydrophobicity; microsystem; molecular dynamic; nanometer-thin lubricant film; wall slip

Abstract
This work discusses the use of slipping domains to improve load support in water-lubricated microsystems through a multi-scale approach. A semi-analytical continuum formulation is developed to calculate changes in pressure distribution for a line contact with added slip. It is found that the slipping region maximizing hydrodynamic lift should favor inlet flow, but not be located at the contact outlet. Estimations for its positioning are provided. Slip on flat surfaces gives the largest gains in load support and friction reduction, but moderate improvements are also possible on circular geometries featuring high convergence ratios. Finally, Molecular Dynamics simulations are employed to quantify slip on hydrophobic surfaces. Among the considered topologies, graphene is an excellent candidate to generate slip in water-lubricated microsystems.

: http://publica.fraunhofer.de/documents/N-487924.html