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Drag reduction of dense fine-grained slurries

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    0352181 - ÚH 2011 RIV SK eng J - Journal Article
    Vlasák, Pavel - Chára, Zdeněk - Štern, Petr
    Drag reduction of dense fine-grained slurries.
    Journal of Hydrology and Hydromechanics. Roč. 58, č. 4 (2010), s. 261-270. ISSN 0042-790X
    R&D Projects: GA ČR(CZ) GAP105/10/1574
    Institutional research plan: CEZ:AV0Z20600510
    Keywords : kaolin slurry * drag reduction * experimental investigation * peptization * slurry rheology
    Subject RIV: BK - Fluid Dynamics
    Impact factor: 0.553, year: 2010

    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.
    Permanent Link: http://hdl.handle.net/11104/0006192
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