Transportation of river sediments in cylindrical pipeline

Abstract

This article deals with the hydraulic transport of river sediments in a cylindrical pipeline. To describe the nature of hydraulic phenomena, experiments were provided for single-phase and two-phase flows in field and laboratory condition. According to the results of the experiments, the main hydraulic parameters of the proposed jet device for hydro transportation of river sediments were determined. Based on the processing of the available data, as well as the data of specially commissioned experiments, the dependencies of flow rates, speed, jet constraining and resistance when the pulp flow from the jet apparatus has expired on the Reynolds number, are valid for certain limits of Reynolds number change. As a result of special experiments, the dependences of local resistance coefficients on the Reynolds number for some practically important cases (when the net flow and pulp from the jet apparatus pipeline have elapsed), valid within certain limits of change of Reynolds numbers, are established. The design parameters of the jet apparatus for the purification of water bodies from river sediments are substantiated, the design formulas for determining the hydraulic parameters of the proposed jet apparatus are proposed. A calculation formula for determining the flow rate of the slurry jet apparatus is proposed. As a result of special experiments, the dependences of the coefficient of hydraulic friction on the Reynolds number for various saturations of flow with a suspension are established. The article offers a new method for determination critical velocity two-phase current, and proposed method is valued with given laboratory condition.