Extraction of smooth component of hydraulic resistance of pipes with grained roughness
There has been shown the contribution of smooth component in the hydraulic resistance of pipes with grained roughness basing on I. Nikuradze formula transform to determine hydraulic resistance coefficients at quadratic regime of flows and hydraulically smooth pipes. It has been supposed that in thin wall layer of the flow the viscous sublayer, the characteristics of which are depended on Reynolds number, is sustained in rough pipes.