Modelling of the Bubble Size Distribution in an Aerated Stirred Tank: Theoretical and Numerical Comparison of Different Breakup Models

• Autorzy: Kálal Z. , Jahoda M. , Fořt I.

Identyfikatory

DOI

10.2478/cpe-2014-0025

• Języki publikacji: EN

Abstrakty

EN

The main topic of this study is the mathematical modelling of bubble size distributions in an aerated stirred tank using the population balance method. The air-water system consisted of a fully baffled vessel with a diameter of 0.29 m, which was equipped with a six-bladed Rushton turbine. The secondary phase was introduced through a ring sparger situated under the impeller. Calculations were performed with the CFD software CFX 14.5. The turbulent quantities were predicted using the standard k-ε turbulence model. Coalescence and breakup of bubbles were modelled using the MUSIG method with 24 bubble size groups. For the bubble size distribution modelling, the breakup model by Luo and Svendsen (1996) typically has been used in the past. However, this breakup model was thoroughly reviewed and its practical applicability was questioned. Therefore, three different breakup models by Martínez-Bazán et al. (1999a, b), Lehr et al. (2002) and Alopaeus et al. (2002) were implemented in the CFD solver and applied to the system. The resulting Sauter mean diameters and local bubble size distributions were compared with experimental data.

Słowa kluczowe

EN

CFD; mixing; gas-liquid; population balance; bubble breakup

PL

CFD; mieszanie; ciecz-gaz

• Wydawca: Komitet Inżynierii Chemicznej i Procesowej Polskiej Akademii Nauk
• Czasopismo: Chemical and Process Engineering
• Rocznik: 2014
• Tom: Vol. 35, nr 3
• Strony: 331--348
• Opis fizyczny: Bibliogr. 41 poz., rys.

Twórcy

autor

Kálal Z.

• Institute of Chemical Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic

autor

Jahoda M.

• Institute of Chemical Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic

autor

Fořt I.

• Czech Technical University in Prague, Technická 4, 166 07 Prague 6, Czech Republic

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