Experimental study of mass transfer in a dense bubble swarm
2011
Colombet, Damien | Legendre, Dominique | Cockx, Arnaud | Guiraud, Pascal | Risso, Frederic | Daniel, Claude | Galinat, Sophie | Institut de mécanique des fluides de Toulouse (IMFT) ; Université Toulouse III - Paul Sabatier (UT3) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP) ; Université de Toulouse (UT) | Laboratoire d'Ingénierie des Systèmes Biologiques et des Procédés (LISBP) ; Institut National de la Recherche Agronomique (INRA)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse) ; Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS) | RHODIA
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Mostrar más [+] Menos [-]Inglés. We consider the liquid-side mass transfer coefficient k L in a dense bubble swarm for a wide range of gas volume fraction (0.45% ≤ α G ≤ 16.5%). The study is performed for an air-water system in a square column. Bubble size, shape and velocity have been measured for different gas flow rates by means of a high speed camera. Gas volume fraction and bubble velocity have also been measured by a dual-tip optical probe. Both of these measurements show that the bubble vertical velocity decreases when increasing α G in agreement with previous investigations. The mass transfer is measured from the time evolution of the dissolved oxygen concentration, which is obtained by the gassing-out method. The mass transfer coefficient is found to be very close to that of a single bubble provided the bubble Reynolds number is based on the average equivalent diameter d eq and the vertical slip velocity V z .
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