Identification of hydrodynamics characteristics in bubble columns through analysis of acoustic sound measurements—Influence of the liquid phase properties

2007 ◽  
Vol 46 (2) ◽  
pp. 127-138 ◽  
Author(s):  
Waheed A. Al-Masry ◽  
Emad M. Ali
Keyword(s):  
Liquid Phase ◽  
Bubble Columns ◽  
Phase Properties

scholarly journals Effect of Surfactants on Gas Holdup in Shear-Thinning Fluids

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Shaobai Li ◽  
Siyuan Huang ◽  
Jungeng Fan
Keyword(s):  
Experimental Data ◽  
Liquid Phase ◽  
Sodium Dodecyl ◽  
Shear Thinning ◽  
Gas Holdup ◽  
Bubble Columns ◽  
Gas Velocity ◽  
Shear Thinning Fluids ◽  
Liquid Surface Tension ◽  
Superficial Gas Velocity

In this study, the gas holdup of bubble swarms in shear-thinning fluids was experimentally studied at superficial gas velocities ranging from 0.001 to 0.02 m·s−1. Carboxylmethyl cellulose (CMC) solutions of 0.2 wt%, 0.6 wt%, and 1.0 wt% with sodium dodecyl sulfate (SDS) as the surfactant were used as the power-law (liquid phase), and nitrogen was used as the gas phase. Effects of SDS concentration, rheological behavior, and physical properties of the liquid phase and superficial gas velocity on gas holdup were investigated. Results indicated that gas holdup increases with increasing superficial gas velocity and decreasing CMC concentration. Moreover, the addition of SDS in CMC solutions increased gas holdup, and the degree increased with the surfactant concentration. An empirical correlation was proposed for evaluating gas holdup as a function of liquid surface tension, density, effective viscosity, rheological property, superficial gas velocity, and geometric characteristics of bubble columns using the experimental data obtained for the different superficial gas velocities and CMC solution concentrations with different surfactant solutions. These proposed correlations reasonably fitted the experimental data obtained for gas holdup in this system.

The effect of liquid phase properties on gas holdup in bubble column reactors

1987 ◽  
Vol 52 (2) ◽  
pp. 335-347 ◽  
Author(s):  
Jindřich Zahradník ◽  
Rudolf Peter ◽  
František Kaštánek
Keyword(s):  
Liquid Phase ◽  
Aqueous Solutions ◽  
Bubble Column ◽  
Gas Holdup ◽  
Bubble Coalescence ◽  
Large Set ◽  
Bubble Column Reactors ◽  
Liquid Systems ◽  
Coalescence Suppression ◽  
Phase Properties

The effect of liquid phase properties on gas holdup in bubble column reactors was investigated within a large set of gas-liquid systems. Air was used as a gaseous phase in all experiments, liquid phases included distilled water and aqueous solutions of alcohols and electrolytes. Gas holdup values were determined in a sieve tray bubble column 0.15 m i.d. under conditions of stable uniform gas distribution and an attempt was made to relate these data with values of bubble coalescence ratio determined for respective gas-liquid systems in a coalescence cell. Experimental results proved strong influence of solute addition on bubble coalescence reduction and on the increase of gas holdup values in aqueous solutions of both alcohols and electrolytes. An unambiguous dependence was observed between gas holdup data and values of bubble coalescence ratio in alcohols solutions, the effect of coalescence suppression on gas holdup enhancement increased markedly with increasing gas flow rates. An empirical equation was proposed for estimation of lower and upper gas holdup limits in electrolyte solutions within the coalescence suppression region, i.e. at solute concentrations above coalescence transition value.With the exception of concentrated glycerol solutions, homogeneous bubble beds were generated in all gas-liquid systems using the appropriate gas distributing plate. The positive effect of coalescence restraining on gas holdup values was even more significant in homogeneous bubble beds than under conditions of turbulent bubbling regime.

Liquid-phase mixing model for hydrodynamics of bubble columns

1989 ◽  
Vol 26 (2) ◽  
pp. 165-172 ◽  
Author(s):  
U Rustemeyer ◽  
J Pauli ◽  
Th Menzel ◽  
R Buchholz ◽  
U Onken
Keyword(s):  
Liquid Phase ◽  
Mixing Model ◽  
Bubble Columns ◽  
Phase Mixing

Modelling churn-turbulent bubble columns—I. Liquid-phase mixing

1987 ◽  
Vol 42 (10) ◽  
pp. 2301-2311 ◽  
Author(s):  
K.J. Myers ◽  
M.P. Duduković ◽  
P.A. Ramachandran
Keyword(s):  
Liquid Phase ◽  
Bubble Columns ◽  
Phase Mixing

Liquid-phase properties and sparger design effects in an external-loop airlift reactor

1995 ◽  
Vol 50 (20) ◽  
pp. 3175-3186 ◽  
Author(s):  
J.B. Snape ◽  
J. Zahradník ◽  
M. Fialová ◽  
N.H. Thomas
Keyword(s):  
Liquid Phase ◽  
Airlift Reactor ◽  
Design Effects ◽  
External Loop ◽  
Phase Properties
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