TY - GEN TI - Flow behaviour of sand-water mixture in horizontal and inclined pipes T3 - Experimental Fluid Mechanics 2019 AU - Vlasák, Pavel AB - 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\nlimit 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. UR - http://www.nusl.cz/ntk/nusl-408978 UR - http://hdl.handle.net/11104/0303294 A2 - Konfršt, Jiří A2 - Matoušek, Václav A2 - Krupička, Jan A2 - Chára, Zdeněk A2 - Mildner, Michael A2 - Kesely, Mikoláš LA - eng KW - deposit limit velocity KW - slurry flow KW - inclined pipe PY - 2019 PB - Ústav pro hydrodynamiku, Pod Paťankou 30 / 5, 166 12 Praha 6, http://www.ih.cas.cz/ ER -