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Experimental investigation on effect of stratification of bimodal settling slurry on slurry flow friction in pipe
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SYSNO ASEP 0548002 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Experimental investigation on effect of stratification of bimodal settling slurry on slurry flow friction in pipe Tvůrce(i) Matoušek, Václav (UH-J) ORCID, SAI, RID
Chára, Zdeněk (UH-J) SAI, ORCID, RID
Konfršt, Jiří (UH-J) SAI, ORCID, RID
Novotný, Jakub (UH-J)Číslo článku 110561 Zdroj.dok. Experimental Thermal and Fluid Science. - : Elsevier - ISSN 0894-1777
Roč. 132, 1 April (2022)Poč.str. 12 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova hydraluic conveying ; multispecies slurry ; flow friction ; solids distribution ; pipe experiment Vědní obor RIV BK - Mechanika tekutin Obor OECD Fluids and plasma physics (including surface physics) CEP GA20-13142S GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora UH-J - RVO:67985874 UT WOS 000736583600006 EID SCOPUS 85120310435 DOI 10.1016/j.expthermflusci.2021.110561 Anotace 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. Pracoviště Ústav pro hydrodynamiku Kontakt Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Rok sběru 2022 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S089417772100203X
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