Flow Regime Identification in a Bubble Column Based on both Kolmogorov Entropy and Quality of Mixedness Derived from CAERPT Data

Authors

  • Stoyan Nedeltchev,

    Corresponding author
    1. Department of Chemical Engineering, Chemical Reaction Engineering Laboratory, Washington University in St. Louis, Campus Box 1198, One Brookings Drive, St. Louis, MO 63130-4899, USA
    Current affiliation:
    1. Department of Chemical Engineering, Ogawa Laboratory, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
    • Department of Chemical Engineering, Chemical Reaction Engineering Laboratory, Washington University in St. Louis, Campus Box 1198, One Brookings Drive, St. Louis, MO 63130-4899, USA
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  • Sailesh B. Kumar,

    1. Department of Chemical Engineering, Chemical Reaction Engineering Laboratory, Washington University in St. Louis, Campus Box 1198, One Brookings Drive, St. Louis, MO 63130-4899, USA
    Current affiliation:
    1. UOP, Riverside, IL, USA
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  • Milorad P. Dudukovic

    1. Department of Chemical Engineering, Chemical Reaction Engineering Laboratory, Washington University in St. Louis, Campus Box 1198, One Brookings Drive, St. Louis, MO 63130-4899, USA
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Abstract

Computer-automated radioactive particle tracking (CARPT) data obtained in a 0.162 m air-water bubble column operated at ambient pressure have been analysed. The superficial gas velocity (Ug) has been varied in the range 0.02-0.12 m/s under constant liquid height 1.04 m. A perforated plate (82 holes ø 0.4 mm, free plate area 0.05 %) distributor has been used. The Kolmogorov entropy (KE) vs. Ug allows identification of the transition velocity (Utrans = 0.064 m/s) between bubbly and transition regimes. KE models for both regimes have been also developed. The quality of mixedness (QM) concept shows that QM(upper zone) ⊕ QM(lower zone) at Utrans = 0.064 m/s.

Abstract

On a analysé des données de traçage radioactif des particules assisté par ordinateur (CARPT) obtenues une colonne à bulles air-eau de 0,162 m de diamètre fonctionnant à la pression ambiante. On a fait varier la vitesse de gaz superficielle (Ug) entre 0,02-0,12 m/s à une hauteur liquide constante de 1,04 m. Un distributeur à plateaux perforés (82 trous × Ø 0,4 mm, zone libre plateaux de 0,05%) a été utilisé. L'entropie de Kolmogorov (KE) en fonction de ug permet de déterminer la vitesse de transition (Utrans = 0,064 m/s) entre le régime bullé et le régime de transition. Des modèles de KE pour ces deux régimes ont également été mis au point. Le concept de qualité de mélange (QM) montre que QM (zone supérieure) ⊕ QM (zone inférieure à Utrans = 0,064 m/s.

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