A Study On The Resistance Characteristics Of Hydraulically Transporting Sands With Different Size In Pipelines

The flow resistance is the basic problem in pipeline hydraulic transport of solid particles. Because of the complexity and difficulty by theoretical study, solid-liquid two-phase flows are mainly studied by experimental method. In this paper, different approaches are employed to analyze the flow resistance of different flow patterns when transporting sands with different size. For the case of transporting suspended fine sand, a single-fluid model is used to calculate the flow resistance by solving the Navier-Stokes equations. The computed agrees well with the measured. And for the case of transporting medium-sized sand, a two-layer model is used and the model produces a good agreement with the experiment data. Finally, the flow resistance and mechanism of transporting coarse sand are discussed and commented for the future study.Results of this paper can be used as a reference for the study of solid-liquid two-phase flow in pipelines and for the design of power drives in the slurry transport system of a dredger.