Surface Roughness and Hydrodynamic Boundary Conditions

Details Surface Roughness and Hydrodynamic Boundary Conditions Surface Roughness and Hydrodynamic Boundary Conditions

2005-10-18

arxiv.org/abs/cond-mat/0510462v2

Physics

Condensed Matter

Soft Condensed Matter

Revised version

Scientific paper

10.1103/PhysRevE.73.045302

We report results of investigations of a high-speed drainage of thin aqueous films squeezed between randomly nanorough surfaces. A significant decrease in hydrodynamic resistance force as compared with predicted by Taylor's equation is observed. However, this reduction in force does not represents the slippage. The measured force is exactly the same as that between equivalent smooth surfaces obeying no-slip boundary conditions, but located at the intermediate position between peaks and valleys of asperities. The shift in hydrodynamic thickness is shown to be independent on the separation and/or shear rate. Our results disagree with previous literature data reporting very large and shear-dependent boundary slip for similar systems.

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