Slip of Newtonian Fluids at Solid Boundary

Abstract

A real fluid does not slip at the surface of a solid body. Most experimental results of a Newtonian fluid satisfy this condition. If a real fluid can slip freely over the surface of a solid body, how can we deduce the slip velocity? Although slip is a basic, interesting problem in fluid mechanics, fundamental data are lacking. The purpose of this study is to clarify fluid slip experimentally. Velocity profiles of tap water and 20 wt% glycerin solution flowing in a square duct with a highly water-repellent wall were measured by means of a hot-film anemometer. Consequently, slip of Newtonian fluids at the solid wall was revealed and explained by Navier's theory.