๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Comparison of Hydrodynamics and Mass Transfer in Airlift and Bubble Column Reactors Using CFD

โœ Scribed by J.M. van Baten; R. Krishna

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
133 KB
Volume
26
Category
Article
ISSN
0930-7516

No coin nor oath required. For personal study only.

โœฆ Synopsis

Abstract

Computational Fluid Dynamics (CFD) is used to compare the hydrodynamics and mass transfer of an internal airlift reactor with that of a bubble column reactor, operating with an air/water system in the homogeneous bubble flow regime. The liquid circulation velocities are significantly higher in the airlift configuration than in bubble columns, leading to significantly lower gas holdups. Within the riser of the airlift, the gas and liquid phases are virtually in plug flow, whereas in bubble columns the gas and liquid phases follow parabolic velocity distributions. When compared at the same superficial gas velocity, the volumetric mass transfer coefficient, k~L~a, for an airlift is significantly lower than that for a bubble column. However, when the results are compared at the same values of gas holdup, the values of k__~L~__a are practically identical.

๐Ÿ“œ SIMILAR VOLUMES

Hydrodynamic characteristics and gasโ€“liq
Hydrodynamic characteristics and gasโ€“liquid mass transfer in a biofilm airlift suspension reactor
โœ C. Nicolella; M. C. M. van Loosdrecht; R. G. J. M. van der Lans; J. J. Heijnen ๐Ÿ“‚ Article ๐Ÿ“… 1998 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 239 KB ๐Ÿ‘ 2 views

The hydrodynamics and mass transfer, specifically the effects of gas velocity and the presence and type of solids on the gas hold-up and volumetric mass transfer coefficient, were studied on a lab-scale airlift reactor with internal draft tube. Basalt particles and biofilmcoated particles were used

Hydrodynamics and mass transfer in a dra
Hydrodynamics and mass transfer in a draft tube airlift reactor with dilute alcohol solutions
โœ B. Albijaniฤ‡; V. Havran; D. Lj. Petroviฤ‡; M. ฤuriฤ‡; M. N. Tekiฤ‡ ๐Ÿ“‚ Article ๐Ÿ“… 2007 ๐Ÿ› American Institute of Chemical Engineers ๐ŸŒ English โš– 372 KB ๐Ÿ‘ 2 views

## Abstract The aim of this work was to investigate an influence of different alcohols on the behavior of a draft tube airlift reactor. The main hydrodynamic and mass transfer parameters in 1 wt % aqueous solutions of five aliphatic alcohols were examined. The results showed that alcohol addition e

Gas-Liquid Hydrodynamics and Mass Transf
Gas-Liquid Hydrodynamics and Mass Transfer in Aqueous Alcohol Solutions in a Split-Cylinder Airlift Reactor
โœ M. K. Moraveji; B. Sajjadi; R. Davarnejad ๐Ÿ“‚ Article ๐Ÿ“… 2011 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 449 KB ๐Ÿ‘ 1 views

## Abstract The influences of aliphatic alcohols (C~n~H~2n+1~OH, __n__โ€‰=โ€‰1โ€“4) and their concentrations (0โ€“1โ€‰vol.โ€%) on gas holdup, liquid circulation velocity, mixing time, and overall volumetric gasโ€liquid oxygen mass transfer coefficient were considered in a splitโ€cylinder airlift reactor sparged

Effect of Suspended Liposomes on Hydrody
Effect of Suspended Liposomes on Hydrodynamic and Oxygen Transfer Properties in a Mini-Scale External Loop Airlift Bubble Column
โœ M. Yoshimoto; C. Momodomi; H. Fukuhara; K. Fukunaga; K. Nakao ๐Ÿ“‚ Article ๐Ÿ“… 2006 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 272 KB

## Abstract The circulating liquid velocity, gas holdup, bubble size distribution, and liquid phase oxygen transfer coefficient were measured in a miniโ€scale external loop airlift bubble column (MELBC) with the liquid volume suspending enzymeโ€free liposomes of varying diameters. These values were c