Journal ArticleDOI
Hydrodynamics and mass transfer in a draft tube airlift reactor with dilute alcohol solutions
TLDR
In this paper, the main hydrodynamic and mass transfer parameters in 1 wt % aqueous solutions of five aliphatic alcohols were examined, and the results showed that alcohol addition enhanced gas holdup and Mass Transfer coefficient, but led to notable reduction of liquid velocity and hence elongation of circulation time, relative to the values determined for water.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 enhanced gas holdup and mass transfer coefficient, but led to notable reduction of liquid velocity and hence elongation of circulation time, relative to the values determined for water. By introducing the surface tension gradient as a relevant independent variable, we defined a simple empirical correlation for overall gas holdup, circulation time, and mass transfer coefficient. The proposed empirical correlations have shown a satisfactory agreement between the calculated and the experimental data. © 2007 American Institute of Chemical Engineers AIChE J, 2007read more
Citations
More filters
Journal ArticleDOI
Two-Phase Bubble Columns: A Comprehensive Review
TL;DR: A comprehensive literature review on the two-phase bubble column is presented in this article, where the authors deeply analyze the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer phenomena.
Journal ArticleDOI
The effect of liquid phase properties on bubble column fluid dynamics: Gas holdup, flow regime transition, bubble size distributions and shapes, interfacial areas and foaming phenomena
Giorgio Besagni,Fabio Inzoli +1 more
TL;DR: In this paper, the influence of the liquid phase properties on bubble column fluid dynamics at the bubble-scale and at the reactor-scale was investigated and a lift-force-based approach was used to analyze the relationship between the bubble scale and the reactor scale.
Journal ArticleDOI
Hydrodynamics and mass transfer characteristics in an internal loop airlift reactor with different spargers
TL;DR: In this article, the effect of the sparger structure on the hydrodynamics and mass transfer characteristics of an internal loop air-lift reactor was investigated, and three spargers with different diameters and numbers of orifices were tested.
Journal ArticleDOI
Experimental investigation on the influence of ethanol on bubble column hydrodynamics
TL;DR: In this paper, the effect of ethanol on the hydrodynamics of a large-diameter and large-scale bubble column is investigated and the results suggest that the addition of ethanol changes the bubble properties, which modifies the bubble size distribution and shapes, thus, stabilizing the homogeneous flow regime and increasing the gas holdup.
Journal ArticleDOI
Gas-Liquid Hydrodynamics and Mass Transfer in Aqueous Alcohol Solutions in a Split-Cylinder Airlift Reactor
TL;DR: In this article, the influence of aliphatic alcohols and their concentrations on gas holdup, liquid circulation velocity, mixing time, and overall volumetric gas-liquid oxygen mass transfer coefficient were considered in a split-cylinder airlift reactor sparged with air.
References
More filters
Journal ArticleDOI
Influence of coalescence behaviour of the liquid and of gas sparging on hydrodynamics and bubble characteristics in a bubble column
TL;DR: In this paper, the effect of liquid phase properties and gas distribution on bubble and hydrodynamic characteristics in bubble columns is investigated, with various measuring techniques used, systematic measurements of bubble size, velocity and frequency and gas hold-up are also available.
Journal ArticleDOI
Gas Absorption by Newtonian and Non-Newtonian Fluids in Sparged Agitated Vessels
Hideharu Yagi,Fumitake Yoshida +1 more
Journal ArticleDOI
Gas Absorption by Newtonian and Non-Newtonian Liquids in a Bubble Column
Morio Nakanoh,Fumitake Yoshida +1 more
Journal ArticleDOI
A simple hydrodynamic model for the liquid circulation velocity in a full-scale two- and three-phase internal airlift reactor operating in the gas recirculation regime
J. J. Heijnen,J. Hols,R. G. J. M. van der Lans,H. L. J. M. van Leeuwen,Arnold Mulder,Rene Weltevrede +5 more
TL;DR: In this article, a simple model to predict the hydrodynamic behavior of a three-phase internal air-lifted reactor is developed, which predicts liquid circulation, gas hold-up and minimum gas supply rates for solids suspension.
Journal ArticleDOI
Determination of the volumetric mass transfer coefficient (kLa) using the dynamic “gas out–gas in” method: Analysis of errors caused by dissolved oxygen probes
TL;DR: The "gas out-gas in" method can directly determine the volumetric mass transfer coefficient in a bioreactor system and provide estimates of thevolumetric microbial oxygen uptake rate and the average oxygen saturation concentration at the gas-liquid interface.