Motion of a particle with stick-slip boundary conditions towards a flat interface: hard wall or free surface
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Institute of Fundamental Technological Research, Polish Academy of Sciences
Publication date: 2017-10-25
Corresponding author
Maria L. Ekiel-Jezewska   

Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5b, 02-106, 02-106 Warsaw, Poland
Physicochem. Probl. Miner. Process. 2018;54(1):203-209
Motion of a particle with stick-slip boundary conditions towards a hard wall or free surface is investigated in the range of Reynolds numbers much smaller than unity, based on the multipole expansion of the Stokes equations. The slip parameter can be interpreted as a measure of a solid particle roughness or as the effect of a surfactant on the motion of a small spherical non-deformable bubble. The particle friction coefficient is evaluated as a function of the distance from its center to the wall, based on the inverse power series expansion, and the results are used to derive explicit lubrication expressions for the friction coefficient, in a wide range of the slip parameters. It is pointed out that for a very small thickness of the fluid film, the lubrication expressions are more accurate than the series expansion. The drainage time is calculated and analyzed, and estimated in terms of explicit lubrication expressions.
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