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Drag reduction of concentrated fine-grained slurries
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SYSNO ASEP 0050697 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Drag reduction of concentrated fine-grained slurries Title Snižování odporu třením pro koncentrované jemnozrnné suspenze Author(s) Vlasák, Pavel (UH-J) SAI, ORCID, RID
Chára, Zdeněk (UH-J) SAI, ORCID, RID
Konfršt, Jiří (UH-J) SAI, ORCID, RIDSource Title 13th International Conference on Transport and Sedimentation of Solid Particles. - Wroclaw : Wydawnictwo Akademii Rolniczej we Wroclawiu, 2006 / Gochitashvili Teimuraz ; Sobota J. - ISSN 0867-7964 - ISBN 83-60574-00-6 Pages s. 177-186 Number of pages 9 s. Action International Conference on Transport and Sedimentation of Solid Particles /13./ Event date 18.09.2006-20.09.2006 VEvent location Tbilisi Country GE - Georgia Event type WRD Language eng - English Country GE - Georgia Keywords concentrated slurry ; kaolin slurry ; ash-water mixture ; effect of shearing ; drag reduction ; effect of particle size distribution Subject RIV BK - Fluid Dynamics R&D Projects IAA200600503 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20600510 - UH-J (2005-2011) Annotation The flow behaviour of concentrated fine-grained slurries is strongly affected by forces acting between particles and carrier liquid, which initiate the coagulation process and rise of voluminous aggregates, where a large deal of water is fixed. To break the aggregates it is necessary to introduce high level of shearing, to modify the particle size distribution or the physical-chemical environment to suppress inter-particle attractive forces between the particles. If the aggregates are destroyed, water originally fixed in the aggregates is liberated and the considerable decrease of the pressure drops can be reached. To prove this process kaolin and ash slurries were tested on the experimental loop. It was demonstrated that shearing, addition of chemical agent or coarse particles could result in significant decrease of the apparen viscosity, yield stress and consequently pressure drops. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2007
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