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

0518120 - ÚH 2022 CZ eng C - Konferenční příspěvek (zahraniční konf.)
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]
Grant CEP: GA ČR GA17-14271S
Institucionální podpora: RVO:67985874
Klíčová slova: slurry flow * inclined pipe * deposit limit velocity
Obor OECD: 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.
Trvalý link: http://hdl.handle.net/11104/0303294