Local volumetric mass transfer coefficients in sections of multiple-impeller stirred tank reactors: Data analysis
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F23%3A00569764" target="_blank" >RIV/67985858:_____/23:00569764 - isvavai.cz</a>
Alternative codes found
RIV/60461373:22340/23:43926787
Result on the web
<a href="https://hdl.handle.net/11104/0341099" target="_blank" >https://hdl.handle.net/11104/0341099</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.cherd.2023.01.001" target="_blank" >10.1016/j.cherd.2023.01.001</a>
Alternative languages
Result language
angličtina
Original language name
Local volumetric mass transfer coefficients in sections of multiple-impeller stirred tank reactors: Data analysis
Original language description
The analysis of local values of volumetric mass transfer coefficient, kLa, was performed to identify the effects of local hydrodynamics on the mass transfer rate in multiple-impeller stirred tank reactors. The database of kLa values measured by Dynamic Pressure Method was analysed. The database provides data for two vessel sizes (laboratory and pilot-scale reactor), a wide range of operational conditions (gas flow rate, impeller speed), various nimpeller geometries and sizes and four different batches including viscous media. The local kLa values in multiple impeller configurations were measured in several positions corresponding to the individual impeller regions. The overall kLa value averaged through the whole volume is considered as the best representation of the correct kLa value. Different hydrodynamic effects on mass transfer rate were obtained in the two end regions. In the bottom region, the local kLa values increase with impeller speed faster than the overall kLa. The opposite behaviour was obtained in the uppermost region corre-sponding to the decrease of power consumption and the mass transfer rate with increasing surface aeration under high impeller speeds. The best representation of the overall kLa value was obtained in the middle position of the vessel, where the exchange flows bring the liquid saturated to different measure from the end regions. Even if the local kLa data in individual impellers' regions are shifted to the average values due to the inter-impeller exchange flows, the differences between them are still significant. We show the local kLa values by the combination of the data measured at different liquid level heights. The results can be used in the fermenter design with various impeller combinations.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20402 - Chemical process engineering
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Chemical Engineering Research and Design
ISSN
0263-8762
e-ISSN
1744-3563
Volume of the periodical
190
Issue of the periodical within the volume
FEB 2023
Country of publishing house
GB - UNITED KINGDOM
Number of pages
13
Pages from-to
829-841
UT code for WoS article
000925458500001
EID of the result in the Scopus database
2-s2.0-85149760999