Theoretical research of friction factor in hydraulically smooth pipes

The paper presents the disclosure of problem calculating friction factor. This exists in calculations head losses for a given flow discharge and geometric parameters pipes. analysis formulas recommended by known scientists is described. article also shortcomings variance adequacy experimental data. These research data were obtained J. Nikuradze smooth We formula based on method dimensional analysis. characterizes inner surface Also, this describes change factor from Reynolds number. accuracy higher than existing formulas.