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Flow behaviour and local concentration of coarse particles-water mixture in inclined pipes

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    0463877 - ÚH 2018 RIV SK eng J - Journal Article
    Vlasák, Pavel - Chára, Zdeněk - Konfršt, Jiří
    Flow behaviour and local concentration of coarse particles-water mixture in inclined pipes.
    Journal of Hydrology and Hydromechanics. Roč. 65, č. 2 (2017), s. 183-191. ISSN 0042-790X. E-ISSN 1338-4333
    R&D Projects: GA ČR GAP105/10/1574
    Institutional support: RVO:67985874
    Keywords : coarse particle mixture * concentration distribution * effect of pipe inclination * gamma-ray radiometry * Hydraulic conveying * mixture flow behaviour
    OECD category: Fluids and plasma physics (including surface physics)
    Impact factor: 1.714, year: 2017

    Narrow particle size distribution basalt pebbles of mean particle size 11.5 mm conveyed by water in the pipe sections of different inclination were investigated on an experimental pipe loop, consisting of smooth stainless steel pipes of inner diameter D = 100 mm. Mixture flow-behaviour and particles motion along the pipe invert were studied in a pipe viewing section, the concentration distribution in pipe cross-section was studied with the application of a gamma-ray densitometer. The study refers to the effect of mixture velocity, overall concentration, and angle of pipe inclination on chord-averaged concentration profiles and local concentration maps, and flow behaviour of the coarse particle-water mixtures. The study revealed that the coarse particle-water mixtures in the inclined pipe sections were significantly stratified, the solid particles moved principally close to the pipe invert, and for higher and moderate flow velocities particle saltation becomes the dominant mode of particle conveying.
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