Drag reduction of dense fine-grained slurries

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Title:Drag reduction of dense fine-grained slurries
Creators:
Vlasák, Pavel; vlasak at ih dot cas dot cz; Institute of Hydrodynamics of Academy of Sciences of the Czech Republic, v. v. i., Pod Patankou 30/5, 166 12 Prague 6, Czech Republic
Chára, Zdeněk; Institute of Hydrodynamics of Academy of Sciences of the Czech Republic, v. v. i., Pod Patankou 30/5, 166 12 Prague 6, Czech Republic
Štern, Petr; Institute of Hydrodynamics of Academy of Sciences of the Czech Republic, v. v. i., Pod Patankou 30/5, 166 12 Prague 6, Czech Republic
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 58, 4, pp. 261-270
Uncontrolled Keywords:Kaolin Slurry, Drag Reduction, Experimental Investigation, Peptization, Slurry Rheology

Abstract

Attractive and repulsive forces acting in the slurry due to different ions absorbed on surface of fine particles, especially colloidal ones, strongly affect the flow behaviour of highly concentrated fine-grained slurries. The attractive forces between the fine-grained solid particles initiate the coagulation process, which gives rise to voluminous aggregates where a large amount of water is fixed. A modification of the physicalchemical environment of the slurry by addition of a peptizing agent produces repulsive forces between particles. They result 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. It was demonstrated that even very low concentration of peptizing agent results in a significant reduction in the apparent viscosity and in the yield stress.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:Drag reduction of dense fine-grained slurries
Translated title:Snižování tření zahuštěných jemnozrnných suspenzí
Creators:
Vlasák, Pavel; vlasak at ih dot cas dot cz; Institute of Hydrodynamics of Academy of Sciences of the Czech Republic, v. v. i., Pod Patankou 30/5, 166 12 Prague 6, Czech Republic
Chára, Zdeněk; Institute of Hydrodynamics of Academy of Sciences of the Czech Republic, v. v. i., Pod Patankou 30/5, 166 12 Prague 6, Czech Republic
Štern, Petr; Institute of Hydrodynamics of Academy of Sciences of the Czech Republic, v. v. i., Pod Patankou 30/5, 166 12 Prague 6, Czech Republic
Uncontrolled Keywords:Kaolin Slurry, Drag Reduction, Experimental Investigation, Peptization, Slurry Rheology
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:58
Number:4
Page Range:pp. 261-270
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:6457
Item Type:Article
Deposited On:14 Jan 2011 14:26
Last Modified:14 Jan 2011 13:26

Citation

Vlasák, Pavel; Chára, Zdeněk; Štern, Petr (2010) Drag reduction of dense fine-grained slurries. Journal of Hydrology and Hydromechanics, 58 (4). pp. 261-270. ISSN 0042-790X

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