Flow of coarse-grained particles-water mixture in pipes

0429616 - ÚH 2015 RIV CZ eng C - Conference Paper (international conference)
Vlasák, Pavel - Chára, Zdeněk - Konfršt, Jiří - Krupička, Jan
Flow of coarse-grained particles-water mixture in pipes.
15th International Freight Pipeline society symposium. Praha: Ústav pro hydrodynamiku, 2014 - (Vlasák, P.; Barešová, M.; Matoušek, V.; Chára, Z.), s. 323-334. ISBN 978-80-87117-12-5.
[15th International Freight Pipeline society symposium. Praha (CZ), 24.06.2014-27.06.2014]
R&D Projects: GA ČR GAP105/10/1574
Institutional support: RVO:67985874
Keywords : heterogeneous slurry * hydraulic conveying * concentration distribution * pressure drop * pipe inclination
Subject RIV: BK - Fluid Dynamics

The advanced knowledge of coarse-grained slurry flow behavior is important for safe, reliable, and economical design and operation of the pipeline transport. The effect of the mixture velocity, solid concentration, and pipe inclination on the coarse-grained particle – water mixtures flow behavior and pressure drop in the turbulent flow regime was experimentally studied in horizontal, vertical, and inclined pipe of inner diameter D = 100 mm. The respective experimental methods, including radiometric methods for particle concentration distribution in pipe cross-section, were used. Graded basalt gravel was used as a model of solid particles. Concentration distribution in the pipe cross-section and motion of particles along the horizontal pipe invert were also studied. The study revealed that the coarse-grained particle-water mixtures in the horizontal and inclined pipes were significantly stratified. The particles moved principally in a layer close to the pipe invert. However, for higher and moderate flow velocities particle saltation becomes dominant mode of particle conveying and particles moved also in the central and upper part of the pipe cross-section.
Permanent Link: http://hdl.handle.net/11104/0234695