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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

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • 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