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Drag reduction of dense fine-grained slurries
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SYSNO ASEP 0352181 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Drag reduction of dense fine-grained slurries Author(s) Vlasák, Pavel (UH-J) SAI, ORCID, RID
Chára, Zdeněk (UH-J) SAI, ORCID, RID
Štern, Petr (UH-J)Number of authors 3 Source Title Journal of Hydrology and Hydromechanics. - : Ústav pro hydromechaniku AV ČR, v. v. i.. - : Ústav hydrológie SAV - ISSN 0042-790X
Roč. 58, č. 4 (2010), s. 261-270Number of pages 10 s. Language eng - English Country SK - Slovakia Keywords kaolin slurry ; drag reduction ; experimental investigation ; peptization ; slurry rheology Subject RIV BK - Fluid Dynamics R&D Projects GAP105/10/1574 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20600510 - UH-J (2005-2011) UT WOS 000286574200005 DOI 10.2478/v10098-010-0024-y Annotation Forces acting in the slurry among particles strongly affect the flow behaviour of highly concentrated fine-grained slurries. The attractive forces initiate a coagulation process, which gives rise to voluminous aggregates where a large amount of water is fixed. A modification of the physical-chemical environment of the slurry by addition of a peptizing agent results in destruction of the aggregates. Water originally fixed in the aggregates is liberated, the viscous friction can play a larger role in the slurry, which is liquefied. To prove these process three different kaolin-water mixtures were tested with an overpressure capillary viscometer, rotational viscometer, and experimental pipeline loop. The effect of two peptizing agents and their concentration was investigated. Even very low concentration of peptizing agent results in a significant reduction in the apparent viscosity and in the yield stress. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2011
Number of the records: 1