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Improvement of an unbaffled stirred tank mixing characteristics using variable speed impeller
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SYSNO ASEP 0585697 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Improvement of an unbaffled stirred tank mixing characteristics using variable speed impeller Author(s) Gebouský, Ondřej (UH-J) ORCID, RID, SAI
Haidl, Jan (UH-J) ORCID, RID, SAI
Bodnár, J. (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. 54-60 Number of pages 7 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 unbaffled mixing tanks ; variable rotational speed ; vortex destabilization ; mixing time improvement Subject RIV CI - Industrial Chemistry, Chemical Engineering OECD category Chemical engineering (plants, products) Institutional support UH-J - RVO:67985874 UT WOS 001242655400008 DOI https://doi.org/10.14311/TPFM.2024.008 Annotation Unbaffled mixing tanks with magnetically driven impellers are increasingly used in biotechnological and pharmaceutical industries, combining the benefits of a closed, sterile environment with easy equipment cleanability. On the other hand, missing internals, such as baffles or cooling coils, have an adverse effect on the equipment mixing characteristics, namely the batch
homogenization time. In our previous research, we uncovered that the eccentricity and inclination of the impeller – both employed routinely to enhance the mixing characteristics of unbaffled vessels – are not fully effective in the suppression of central vortex formation resulting in the increase in the homogenization time. In this work, we propose a simple solution to counteract the central vortex formation – a periodical variation of impeller rotational speed. This approach destabilizes the central vortex, significantly reducing homogenization time while maintaining the benefits of the original unbaffled setup. This innovation can seamlessly integrate into existing industrial setups, promising efficiency gains for biotech and pharmaceutical production.Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2025
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