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Flow simulations approach for flocculation tanks
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SYSNO ASEP 0585700 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Flow simulations approach for flocculation tanks Author(s) Idžakovičová, Kristýna (UH-J) RID, ORCID, SAI
Bílek, Vojtěch (UH-J) ORCID, RID
Haidl, Jan (UH-J) ORCID, RID, SAI
Isoz, M. (CZ)
Pivokonský, Martin (UH-J) SAI, ORCID, RIDSource Title Topical Problems of Fluid Mechanics. - Prague : Institute of Thermomechanics AS CR, v. v. i., 2024 / Šimurda D. ; Bodnár T. - ISSN 2336-5781 - ISBN 978-80-87012-88-8 Pages s. 77-84 Number of pages 8 s. Publication form Online - E Action Topical Problems of Fluid Mechanics 2024 Event date 21.02.2024 - 23.02.2024 VEvent location Prague Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords flocculation tank ; stirring ; MRF ; CFD ; OpenFOAM Subject RIV CI - Industrial Chemistry, Chemical Engineering OECD category Chemical engineering (plants, products) Institutional support UH-J - RVO:67985874 UT WOS 001242655400011 DOI https://doi.org/10.14311/TPFM.2024.011 Annotation Flocculation in water treatment facilities plays a key role in the separation of colloidal inorganic and organic substances. Its optimization leads to a significant increase in its efficiency and savings of operational costs. However, it is currently based on trial-and-error experimental approaches. In this contribution, we focus on flow modeling in stirred flocculation tanks that would, after coupling with a calibrated model of particle aggregation, enable simulationbased flocculation optimization. Despite the abundance of literature on stirred tank modeling, there is no universal agreement on the methodology used to describe turbulence nor on the approach to the computational mesh creation. Consequently, there is no unified methodology for simulations and their validation. To address this, we present a best-practice methodology for economical, yet reliable flow simulations in the said device. This methodology includes the choice of the turbulence model, the approach to the design of a high quality mesh suitable for arbitrary geometries, and results evaluation. It is developed based on an extensive literature review, a multitude of flow simulations using several meshes of progressively higher quality and resolution, and various strategies to converge to steady-state flow conditions. The simulation quality indicators used here involve comparison with the experimental data on fluid velocity, stirrer power output, and flow rate through the impeller zone. Additionally, the resulting flow simulation models are compared using tracer transport simulations, hinting at their potential for coupling with particle aggregation models. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2025
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