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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We report results of lattice Boltzmann simulations of a high-speed drainage of liquid films squeezed
between a smooth sphere and a randomly rough plane. A significant decrease in the hydrodynamic
resistance force as compared with that predicted for two smooth surfaces is observed. However, this force
reduction does not represent slippage. The computed force is exactly the same as that between equivalent
smooth surfaces obeying no-slip boundary conditions, but located at an intermediate position between
peaks and valleys of asperities. The shift in hydrodynamic thickness is shown to depend on the height and
density of roughness elements. Our results do not support some previous experimental conclusions on a
very large and shear-dependent boundary slip for similar systems.