Distribution of medium-to-coarse glass beads in slurry pipe flow: evaluation of measured concentration profiles

0420876 - ÚH 2014 RIV US eng J - Journal Article
Matoušek, Václav - Krupička, Jan - Pěník, Vojtěch
Distribution of medium-to-coarse glass beads in slurry pipe flow: evaluation of measured concentration profiles.
Particulate Science and Technology. Roč. 32, č. 2 (2014), s. 186-196. ISSN 0272-6351. E-ISSN 1548-0046.
[7th International Conference for Conveying and Handling of Particulate Solids (CHoPS). Friedrichshafen, 10.09.2013-13.09.2012]
R&D Projects: GA ČR GA103/09/0383
Institutional support: RVO:67985874
Keywords : concentration distribution * high concentrated slurry * pipeline flow * slurry flow experiment
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 0.523, year: 2014

Concentration distribution of two fractions of glass-bead (ballotini) particles (medium size 0.44 mm, 0.53 mm respectively) in flows of heterogeneous slurry was measured in a laboratory pipe of the internal diameter of 100 mm using a radiometric device. Particles in such flows are supported by both interparticle contacts and turbulent eddies and the solids load must be considered as combined load composed of both contact-, and suspended load. Flows tend to be partially stratified and if high concentrated (mean volumetric concentration of solids higher than approximately 20 per cent) they exhibit a sliding bed. It appears that two most common methods to calculate concentration profiles in settling-slurry flows are not able to handle the sliding bed adequately. A comparison of the test results with the Gillies-Shook model for combined-load flows shows that the modeling approach requires further refinements. An application of the more recent Kaushal-Tomita model based on the turbulent-diffusion concept is inappropriate in high-concentrated slurries composed of medium-to-coarse grains. A simple 1-D model is proposed that takes conditions for an existence of a sliding bed into account and predicts a simplified concentration profile in stratified flows composed of a sliding bed and a transport layer above the bed.
Permanent Link: http://hdl.handle.net/11104/0232876