Gas-liquid mass transfer coefficient in stirred tanks interpreted through models of idealized eddy structure of turbulence in the bubble vicinity.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F04%3A00011145" target="_blank" >RIV/60461373:22340/04:00011145 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985858:_____/04:00099447

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Gas-liquid mass transfer coefficient in stirred tanks interpreted through models of idealized eddy structure of turbulence in the bubble vicinity.

Popis výsledku v původním jazyce

Experimental data on the average mass transfer liquid film coefficient (kL) in an aerated tank stirred by two Rushton turbines on common shaft are presented. Liquid media used were distilled water and 0.5 M sodium sulphate solution. Volumetric mass transfer coefficient (kLa) was measured by the dynamic pressure method with pure oxygen absorption. Specific interfacial area a was taken from Alves et al. [Chem. Eng. Proc., in press] who measured data on local gas hold-up and local average bubble diameter in the same apparatus and batches. Values of kL are quantitatively interpreted in terms of correlations based on idealized eddy structures of turbulence in the bubble vicinity, namely by "eddy" model by Lamont and Scott [AIChE J. 16 (1970) 513] in the form of kL =0.523 (e?/?)0.25 (D/?)0.5 , which fits the data with the mean deviation of 4.7%. It is shown that the decisive quantity to correlate kL in the stirred tank is power dissipated in the liquid phase rather than the bubble diameter a

Název v anglickém jazyce

Gas-liquid mass transfer coefficient in stirred tanks interpreted through models of idealized eddy structure of turbulence in the bubble vicinity.

Popis výsledku anglicky

Experimental data on the average mass transfer liquid film coefficient (kL) in an aerated tank stirred by two Rushton turbines on common shaft are presented. Liquid media used were distilled water and 0.5 M sodium sulphate solution. Volumetric mass transfer coefficient (kLa) was measured by the dynamic pressure method with pure oxygen absorption. Specific interfacial area a was taken from Alves et al. [Chem. Eng. Proc., in press] who measured data on local gas hold-up and local average bubble diameter in the same apparatus and batches. Values of kL are quantitatively interpreted in terms of correlations based on idealized eddy structures of turbulence in the bubble vicinity, namely by "eddy" model by Lamont and Scott [AIChE J. 16 (1970) 513] in the form of kL =0.523 (e?/?)0.25 (D/?)0.5 , which fits the data with the mean deviation of 4.7%. It is shown that the decisive quantity to correlate kL in the stirred tank is power dissipated in the liquid phase rather than the bubble diameter a

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

<a href="/cs/project/GA104%2F98%2F1126" target="_blank" >GA104/98/1126: Studium mechanizmu mezifázového transportu hmoty v disperzích plyn-kapalina. Vliv velikosti bublin.</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2004

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Chemical Engineering and Processing

ISSN

0255-2701

e-ISSN

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Svazek periodika

43

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

BE - Belgické království

Počet stran výsledku

17

Strana od-do

1511-1517

Kód UT WoS článku

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EID výsledku v databázi Scopus

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