Concentration distribution and deposition limit of medium-coarse sand-water slurry in inclined pipe

0517222 - ÚH 2021 RIV SK eng J - Journal Article
Vlasák, Pavel - Matoušek, Václav - Chára, Zdeněk - Krupička, Jan - Konfršt, Jiří - Kesely, Mikoláš
Concentration distribution and deposition limit of medium-coarse sand-water slurry in inclined pipe.
Journal of Hydrology and Hydromechanics. Roč. 68, č. 1 (2020), s. 83-91. ISSN 0042-790X. E-ISSN 1338-4333
R&D Projects: GA ČR GA17-14271S
Institutional support: RVO:67985874
Keywords : sand-slurry * pipe inclination * concentration distribution * deposition limit * gamma-ray radiometry
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.512, year: 2020
Method of publishing: Open access

Sand-water slurry was investigated on an experimental pipe loop of inner diameter D = 100 mm with the hori-zontal, inclined, and vertical smooth pipe sections. A narrow particle size distribution silica sand of mean diameter0.87 mm was used. The experimental investigation focused on the effects of pipe inclination, overall slurry concentration, and mean velocity on concentration distribution and deposition limit velocity. The measured concentration profiles showed different degrees of stratification for the positive and negative pipe inclinations. The degree of stratification depended on the pipe inclination and on overall slurry concentrationand velocity. The ascending flow was less stratified than the cor-responding descending flow, the difference increasing from horizontal flow up to an inclination angle of about +30°. The deposition limit velocity was sensitive to the pipe inclination,reaching higher values in the ascending than in the hori-zontal pipe. The maximum deposition limit value was reached for an inclination angle of about +25°, and the limit remained practically constant in value, about 1.25 times higher than that in the horizontal pipe. Conversely, in the de-scending pipe, the deposition limit decreased significantly with the negative slopes and tended to be zero for an inclina-tion angle of about −30°, where no stationary bed was observed.
Permanent Link: http://hdl.handle.net/11104/0307261