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The effect of shear rate on aggregate size distribution and structure at steady state: a comparison between a Taylor–Couette reactor to a mixing tank
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SYSNO ASEP 0393135 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The effect of shear rate on aggregate size distribution and structure at steady state: a comparison between a Taylor–Couette reactor to a mixing tank Author(s) Bubáková, Petra (UH-J) SAI, ORCID, RID
Pivokonský, Martin (UH-J) SAI, ORCID, RID
Pivokonský, Radek (UH-J) SAI, ORCID, RID
Filip, Petr (UH-J) ORCID, RID, SAISource Title Journal of Water Supply Research and Technology. AQUA. - : IWA Publishing - ISSN 0003-7214
Roč. 62, č. 5 (2013), s. 288-295Number of pages 8 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords aggregate size distribution ; aggregation ; flocculation ; fractal dimension ; shear rate Subject RIV BK - Fluid Dynamics OECD category Fluids and plasma physics (including surface physics) R&D Projects GAP105/11/0247 GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UH-J - RVO:67985874 UT WOS 000322708000004 EID SCOPUS 84882755412 DOI https://doi.org/10.2166/aqua.2013.005 Annotation The paper deals with the dependence of aggregate properties on the shear rate (G) at steady state. Aggregation of natural raw water and ferric sulphate was carried out in a laboratory Taylor–Couette reactor (TC) and continuous flow mixing tank (MT) with a paddle stirrer. Shear rates in the range of 20–350 s -1 were used.Methods of image and fractal analyses were used to determine the aggregate size and structure, respectively. It was found that the aggregate size decreased with increasing shear rate. There was a small difference in sizes of aggregates formed in TC and MT at G< 150 s -1, but at higher shear rates, almost no difference between TC and MT was observed. The D2 fractal dimension increased with increasing shear rate indicating that aggregates became less porous andmore compact. Moreover, a very closematch in D2 valueswas attained for both mixing devices. The Dpf fractal dimension decreased with increasing shear rate meaning that aggregates were more regular at higher shear rates, but jagged on the surface with irregular shape at lower shear rates. In contrast to D2, aggregates formed in MT were much more irregular (jagged) than those formed in TC. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2015 Electronic address https://iwaponline.com/aqua/article-abstract/62/5/288/29147/The-effect-of-shear-rate-on-aggregate-size?redirectedFrom=fulltext
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