Abstract
Simple but systematic expressions for eddy viscosity based on the available experimental results are presented and the universal velocity profile is obtained from the eddy viscosity distribution. The present analysis takes account of the Reynolds number effect on the eddy viscosity.
The friction factor based on the universal velocity profile was in good agreement with the Blasius formula, which was derived from the (1/7)-power law of the velocity profile, and was sepresented precisely by the Prandtls universal law of friction.
