Vliv kontaminantů na koeficienty přestupu hmoty v bublané koloně a airlift kontaktorech.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F03%3A00081951" target="_blank" >RIV/67985858:_____/03:00081951 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Effect of Contaminants on Mass Transfer Coefficients in Bubble Column and Airlift Contactors.

Popis výsledku v původním jazyce

In this work, the effects of surface-active contaminants on mass transfer coefficients kLa and kL were studied in two different bubble contactors. The oxygen transfer coefficient, kL, was obtained from the volumetric oxygen transfer coefficient, kLa, since the specific interfacial area, a, could be determined from the fractional gas holdup, ?, and the average bubble diameter, d32. Water at different heights and antifoam solutions of 0.5-100 ppm were used as working media, under varying gas sparging conditions, in small-scale bubble column and rectangular airlift contactors of 6.7 and 0.85x10-3 m3 capacity, respectively. Both the antifoam concentration and the bubble residence time were shown to control kLa and kL values over a span of almost 400%. A theoretical interpretation is proposed based on modelling the kinetics of single bubble contamination, followed by sudden surface transition from mobile to rigid condition, in accordance with the stagnant cap model.

Název v anglickém jazyce

Effect of Contaminants on Mass Transfer Coefficients in Bubble Column and Airlift Contactors.

Popis výsledku anglicky

In this work, the effects of surface-active contaminants on mass transfer coefficients kLa and kL were studied in two different bubble contactors. The oxygen transfer coefficient, kL, was obtained from the volumetric oxygen transfer coefficient, kLa, since the specific interfacial area, a, could be determined from the fractional gas holdup, ?, and the average bubble diameter, d32. Water at different heights and antifoam solutions of 0.5-100 ppm were used as working media, under varying gas sparging conditions, in small-scale bubble column and rectangular airlift contactors of 6.7 and 0.85x10-3 m3 capacity, respectively. Both the antifoam concentration and the bubble residence time were shown to control kLa and kL values over a span of almost 400%. A theoretical interpretation is proposed based on modelling the kinetics of single bubble contamination, followed by sudden surface transition from mobile to rigid condition, in accordance with the stagnant cap model.

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

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2003

Kód důvěrnosti údajů

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

Název periodika

Chemical Engineering Science

ISSN

0009-2509

e-ISSN

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Svazek periodika

58

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

1431-1440

Kód UT WoS článku

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EID výsledku v databázi Scopus

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