Development of a Validated Model for Mass Transfer in Bubble Column

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F24%3A00598144" target="_blank" >RIV/67985858:_____/24:00598144 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0355874" target="_blank" >https://hdl.handle.net/11104/0355874</a>

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Development of a Validated Model for Mass Transfer in Bubble Column

Popis výsledku v původním jazyce

Mass transfer and axial mixing is studied in bubble column with a diameter of 0.19 m. Axial dispersion coefficient was obtained from tracing experiment and present data suggest that it changes considerably with increasing aspect ratio (ratio of liquid free level to column diameter). Simple empirical correlation predicting axial dispersion coefficient in dependence on gas superficial velocity and aspect ratio was provided. However, obtained data gave relatively high deviations caused by periodic behavior of the system and presence of reverse vorteces enhancing liquid back-mixing. Volumetric mass transfer coefficient was obtained using Dynamic Pressure Method. Experimentally obtained concentration profiles are fitted by a model with coefficient as a fitted parameter. Two models were tested: model assuming ideal liquid mixing and extended model assuming liquid axial dispersion. Comparison of volumetric mass transfer coefficients obtained from extended model and ideal mixing model at constant aspect ratio of 5.3 shows that the difference is minimal and mixing can be assumed as ideal for lower gas superficial velocities (uG < 0.05 m/s). A significant difference was obtained under high gas superficial velocities (uG > 0.05 m/s) resulting in a non-negligible effect of axial dispersion in bubble column.

Název v anglickém jazyce

Development of a Validated Model for Mass Transfer in Bubble Column

Popis výsledku anglicky

Mass transfer and axial mixing is studied in bubble column with a diameter of 0.19 m. Axial dispersion coefficient was obtained from tracing experiment and present data suggest that it changes considerably with increasing aspect ratio (ratio of liquid free level to column diameter). Simple empirical correlation predicting axial dispersion coefficient in dependence on gas superficial velocity and aspect ratio was provided. However, obtained data gave relatively high deviations caused by periodic behavior of the system and presence of reverse vorteces enhancing liquid back-mixing. Volumetric mass transfer coefficient was obtained using Dynamic Pressure Method. Experimentally obtained concentration profiles are fitted by a model with coefficient as a fitted parameter. Two models were tested: model assuming ideal liquid mixing and extended model assuming liquid axial dispersion. Comparison of volumetric mass transfer coefficients obtained from extended model and ideal mixing model at constant aspect ratio of 5.3 shows that the difference is minimal and mixing can be assumed as ideal for lower gas superficial velocities (uG < 0.05 m/s). A significant difference was obtained under high gas superficial velocities (uG > 0.05 m/s) resulting in a non-negligible effect of axial dispersion in bubble column.

Druh

O - Ostatní výsledky

CEP obor

—

OECD FORD obor

20402 - Chemical process engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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