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Flow behaviour of sand-water mixture in horizontal and inclined pipes

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    0518120 - ÚH 2022 CZ eng C - Conference Paper (international conference)
    Vlasák, Pavel - Chára, Zdeněk - Matoušek, Václav - Kesely, Mikoláš - Krupička, Jan - Konfršt, Jiří - Mildner, Michael
    Flow behaviour of sand-water mixture in horizontal and inclined pipes.
    Proceedings of the International conference Experimental Fluid Mechanics 2019. Vol. 1 vydání. Franzenbad: Experimental Fluid Mechanics, 2019 - (Dančová, P.; Novosád, J.; Pulec, J.), s. 580-586
    [Experimental Fluid Mechanics 2019. Františkovy Lázně (CZ), 19.11.2019-22.11.2019]
    R&D Projects: GA ČR GA17-14271S
    Institutional support: RVO:67985874
    Keywords : slurry flow * inclined pipe * deposit limit velocity
    OECD category: Fluids and plasma physics (including surface physics)

    Pipelines transporting slurries in different industrial applications often contain inclined sections. The effect of pipe inclination, slurry concentration and mean velocity on the flow behaviour, deposition
    limit velocity, and internal structure of a settling slurry was studied in an experimental pipe loop of inner diameter D = 100 mm. The slurry consisted from water and a narrow particle size distribution sand of mean diameter d50 = 0.55 mm. The experiments focused on the effects of the pipe inclination on solids distribution and deposition limit velocity. The concentration distribution in pipe cross-section was studied with application of a gamma-ray densitometer. The study revealed the stratified flow pattern of the medium sand-water mixture in inclined pipe sections. Experimental results show that the degree of the slurry stratification decreased with an increasing angle of inclination in the ascending pipe sections. The slurry stratification affected the deposition limit velocity. Mean in situ concentration for the descending flow was always lower than that for the ascending flow. The deposition limit in ascending pipe, in comparison with that in a horizontal pipe, slightly increased up to inclination angle about +25°, and then remained practically constant. For negative pipe inclination over – 30° no deposition limit was observed.
    Permanent Link: http://hdl.handle.net/11104/0303294

     
     
Number of the records: 1