Critical impeller speed for complete gas-liquid dispersion for various impeller types
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F21%3A43923790" target="_blank" >RIV/60461373:22340/21:43923790 - isvavai.cz</a>
Result on the web
<a href="http://sschi.chtf.stuba.sk/data/full_papers/320.pdf" target="_blank" >http://sschi.chtf.stuba.sk/data/full_papers/320.pdf</a>
DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Critical impeller speed for complete gas-liquid dispersion for various impeller types
Original language description
Stirred tank reactors are widely used in various chemical and biochemical technologies. In the case of bioreactors, the effectiveness of aerobic fermentation is mostly controlled by two opposing processes – maximization of the oxygen mass transfer rate and minimization of the shear-stress damaging the microorganism cultures. The knowledge of critical conditions ensuring the sufficient supply of oxygen and simultaneously minimalizing the damaging of microorganisms is crucial for the successful design and scale-up of the bioreactor. The aim of the contribution is to obtain the critical impeller speed for the complete dispersion of various impeller types in stirred tank reactors of two sizes (0.29 and 0.59 m inner diameter). Four impeller types are used: Rushton turbine (RT, radial impeller), pitched blade impeller (PBD), Techmix 335 (TXD), and Lightnin A315 (LTN, all axial impellers pumping down). The critical impeller speed is obtained from the dependence of power number on gas flow number under aerated conditions. The used liquid phases are distilled water (coalescent batch), 0.5M Na2SO4 solution (non-coalescent batch) and 1.2 %(wt) solution of commercial thickener Sokrat 44 (viscous non-coalescent batch). The critical impeller speed of radial impeller (RT) is smaller in comparison with axial impellers. This suggests the more intense mixing and dispersion production for radial impeller but simultaneously higher shear stresses which would damage the microorganism culture.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20401 - Chemical engineering (plants, products)
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
PROCEEDINGS 47th International Conference of the Slovak Society of Chemical Engineering
ISBN
978-80-8208-057-8
ISSN
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e-ISSN
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Number of pages
8
Pages from-to
1-8
Publisher name
Vydavateľstvo STU v Bratislave
Place of publication
Bratislava
Event location
Bratislava
Event date
May 18, 2021
Type of event by nationality
EUR - Evropská akce
UT code for WoS article
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