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Effect of shear rate on aggregate size and structure in the process of aggregation and at steady state
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SYSNO ASEP 0384987 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of shear rate on aggregate size and structure in the process of aggregation and at steady state Author(s) Bubáková, Petra (UH-J) SAI, ORCID, RID
Pivokonský, Martin (UH-J) SAI, ORCID, RID
Filip, Petr (UH-J) ORCID, RID, SAISource Title Powder Technology. - : Elsevier - ISSN 0032-5910
Roč. 235, February (2013), s. 540-549Number of pages 10 s. Publication form Print - P Language eng - English Country CH - Switzerland Keywords aggregation ; aggregate size ; fractal dimension ; shear rate ; steady state ; time evolution 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 000316039400068 EID SCOPUS 84871505445 DOI 10.1016/j.powtec.2012.11.014 Annotation The paper deals with the dependence of aggregate properties on the shear rate (G) in the aggregation process and at steady state. Natural raw water and ferric sulphate were aggregated in a Taylor–Couette reactor. The methods of image and fractal analysis were used to determine the aggregate size and structure. It was observed that at the early phase of aggregation, the aggregate growth rate is higher for lower shear rates. At G≤150 s−1, the time aggregation curve contains the local maximum before reaching the steady state. Moreover, the different extent of break-up and restructuring was proved for different values of shear rate. At G≥200 s−1, the aggregation curve misses the local extreme completely. Itwas found thatwith increasing shear rate (G=21.2–347.9 s−1), the aggregates are smaller (d=1504–56 μm),more compact (D2=1.54–1.91) and more regular (Dpf=1.37–1.10). A relationship for the description of dependence of fractal dimension on the shear rate was also suggested. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2013 Electronic address https://www.sciencedirect.com/science/article/pii/S0032591012007632?via%3Dihub
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