Autor segons l'article: Kouzbour, Sanaa; Maniscalco, Francesco; Buffo, Antonio; Vanni, Marco; Grau, Francesc Xavier; Gourich, Bouchaib; Stiriba, Youssef
Departament: Enginyeria Mecànica
Autor/s de la URV: Grau Vidal, Francesc Xavier / Stiriba, Youssef
Paraules clau: Surface tension; Size distributions; Gas-liquid mass transfer; Cfd-pbm coupled model; Bubble size; Bubble column; transfer coefficients; surface tension; single bubbles; quadrature method; numerical-simulation; liquid; gas-liquid mass transfer; gas holdup; coalescence; cfd-pbm coupled model; bubble size; breakage; 2-phase flow
Resum: This work examined experimentally and numerically the effects of sodium dodecyl sulfate (SDS) surfactant agent on mass transfer coefficients kLaL and kL in a high-aspect square bubble column reactor. To this end, SDS aqueous solutions at concentrations between 5 ppm and 30 ppm were prepared. Superficial gas velocity was varied from 0.74 cm.s−1 to 9.44 cm.s−1 covering all flow regimes to analyze the interaction between different phases and the effect of liquid surface tension on gas-liquid interfaces. Experimental data indicated that the presence of the SDS in the liquid phase augmented the overall gas holdup up to 25% at a constant gas velocity (Ug = 7.3 cm.s−1) in the transition regime, which is due to the role of SDS in bubble interactions. The impact of SDS addition on the mass transfer is twofold. Firstly, it reduced kL because the SDS molecules migrate towards the bubble-liquid interface thanks to the lower O2 diffusivity in water, thus hindering the O2 transfer from one phase to the other. Secondly, it increased aL owing to the inhibition of bubbles coalescence and, therefore, the lower mean bubble size. Among these two effects, the latter is prevailing, which led to an increase in kLaL in contaminated systems. In the second part of this work, a population balance model (PBM) was coupled with a computational fluid dynamics (CFD) model based on large-eddy simulation (LES) to analyze the effect of both tap water and SDS contaminated systems on the breakage phenomena, local flow pattern, and the resulting hydrodynamics and mass transfer features in the reactor. Ultimately, experiments and numerical simulations agreed well in terms of global gas holdup and kLaL coefficient. In particular, the transition points in the case of the SDS media (except for foam formation) provided the model with adequate PBM definitions for the dispersed phase.
Àrees temàtiques: Physics and astronomy (miscellaneous); Physics and astronomy (all); Mechanics; Mechanical engineering; Matemática / probabilidade e estatística; General physics and astronomy; Fluid flow and transfer processes; Engenharias iv; Engenharias iii; Engenharias ii; Ciência de alimentos; Ciência da computação; Biodiversidade
Adreça de correu electrònic de l'autor: youssef.stiriba@urv.cat; francescxavier.grau@urv.cat
Data d'alta del registre: 2024-10-12
Versió de l'article dipositat: info:eu-repo/semantics/acceptedVersion
Enllaç font original: https://www.sciencedirect.com/science/article/abs/pii/S0301932223001076
URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
Referència a l'article segons font original: International Journal Of Multiphase Flow. 165 104486-
Referència de l'ítem segons les normes APA: Kouzbour, Sanaa; Maniscalco, Francesco; Buffo, Antonio; Vanni, Marco; Grau, Francesc Xavier; Gourich, Bouchaib; Stiriba, Youssef (2023). Effects of SDS surface-active agents on hydrodynamics and oxygen mass transfer in a square bubble column reactor: Experimental and CFD modeling study. International Journal Of Multiphase Flow, 165(), 104486-. DOI: 10.1016/j.ijmultiphaseflow.2023.104486
DOI de l'article: 10.1016/j.ijmultiphaseflow.2023.104486
Entitat: Universitat Rovira i Virgili
Any de publicació de la revista: 2023
Tipus de publicació: Journal Publications
Repositori URV