HYDRODYNAMIC RESISTANCE TO APPROACH OF 2 CROSSED HYDROPHOBIC CYLINDERS

The drainage of a thin Liquid film confined between two crossed hydrop hobic cylinders was theoretically investigated. The role of hydrophobi city was revealed in the slippage of liquid over the solid. An equatio n for hydrodynamic resistance force to the approach of the cylinders w as derived. It was shown, that this equation may be presented as a pro duct of two factors, one of which is the resistance to motion of two h ydrophilic cylinders, while the other is the correction for slippage t hat depends only on the ratio of the slip length and the gap at minimu m separation. The derived expression allows one to correct the results of measurements of hydrophobic attractive forces obtained with the dr ainage technique.