Experimental investigation on effect of stratification of bimodal settling slurry on slurry flow friction in pipe

0548002 - ÚH 2022 RIV NL eng J - Journal Article
Matoušek, Václav - Chára, Zdeněk - Konfršt, Jiří - Novotný, Jakub
Experimental investigation on effect of stratification of bimodal settling slurry on slurry flow friction in pipe.
Experimental Thermal and Fluid Science. Roč. 132, 1 April (2022), č. článku 110561. ISSN 0894-1777. E-ISSN 1879-2286
R&D Projects: GA ČR(CZ) GA20-13142S
Institutional support: RVO:67985874
Keywords : hydraluic conveying * multispecies slurry * flow friction * solids distribution * pipe experiment
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 3.2, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S089417772100203X

Pipe flows of bimodal aqueous slurries of two fractions of sand (coarse sand of particle mass-median size of 1.56 mm and fine-to-medium sand of mass-median size of 0.22 mm) are tested in a laboratory loop (pipe internal diameter of 100 mm) to study the frictional loss reduction due to the presence of the finer fraction in the bimodal slurry. The tested bimodal slurry flows (mean solids volumetric concentrations of 0.23, 0.30, 0.45 respectively) are compared with their coarse slurry counterparts (flows of one-species slurry at solids concentrations of 0.17, 0.24, 0.34 respectively, without the finer fraction) in tests which include measurements of solids distribution in a pipe cross section and measurements of local velocity of solid particles at the bottom of the pipe. The tests reveal a presence of a sliding bed in the bimodal slurry flow and a development of a thin fine-particle layer at the interface between the bottom of the sliding bed and the pipe wall. The measured difference in local velocities of fine particles and coarse particles at the bottom of the pipe indicates that the fine-particle layer effectively separates the sliding bed from the pipe wall hence it is responsible for the reduction of sliding friction at the wall and reduction of the overall frictional loss in bimodal flow compared to its coarse slurry counterpart. The identified loss reducing mechanism can improve modelling of stratified settling slurry flows composed of solids fractions of different sizes interacting with each other in a pipe.
Permanent Link: http://hdl.handle.net/11104/0325742