Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Effect of surfactant lengths on gas-liquid oxygen mass transfer from a single rising bubble

Abstract : This work is an experimental investigation of the effect of the nature of surfactants on oxygen mass transfer. The study focuses on three cationic surfactants with different hydrophobic chain lengths, and four nonionic surfactants with different hydrophilic chain lengths. Equilibrium adsorption isotherms are calculated for each surfactant from experimental values of surface tension in static conditions. Surfactant solutions at concentrations between 2.5×10-8 and 5×10-3 mol/L were prepared and oxygen transfer from millimetric air bubbles (between 0.82 and 1.08 mm) was measured by Planar Laser Induced Fluorescence with Inhibition (PLIF-I). When the bulk concentration of surfactant was increased, results showed a sharp decrease of bubble velocity, in the range of 283-75 mm/s, and of liquid-side mass transfer coefficient, in the range of 5.6 ×10-4-0.4 ×10-4 m/s. This effect was observed for all surfactants studied. However, the length of the hydrophilic chain did not appear to affect the hydrodynamics of the rising bubble or the oxygen transfer at the same bulk concentration. Furthermore, for the same bulk concentration, increasing the hydrophobic chain length had an impact on the velocity and the mass transfer coefficient of oxygen. Finally, the Sherwood number was calculated in each medium and compared with classical correlations for gas-liquid mass transfer prediction. Those correlations seemed to reach a limit for a very concentrated medium.
Type de document :
Article dans une revue
Domaine :
Liste complète des métadonnées

https://hal.insa-toulouse.fr/hal-03348522
Contributeur : Nicolas Dietrich Connectez-vous pour contacter le contributeur
Soumis le : dimanche 19 septembre 2021 - 10:27:00
Dernière modification le : dimanche 17 octobre 2021 - 15:56:02

Fichier

 Accès restreint
Fichier visible le : 2022-03-08

Connectez-vous pour demander l'accès au fichier

Identifiants

Citation

Gaëlle Lebrun, Sanae Benaissa, Claude Le Men, Véronique Pimienta, Gilles Hébrard, et al.. Effect of surfactant lengths on gas-liquid oxygen mass transfer from a single rising bubble. Chemical Engineering Science, Elsevier, 2022, 247, pp.117102. ⟨10.1016/j.ces.2021.117102⟩. ⟨hal-03348522⟩

Partager

Métriques

Consultations de la notice

970