scholarly journals Critical gas velocity required for complete suspension of solid particles in solid-suspended bubble columns.

1983 ◽  
Vol 16 (1) ◽  
pp. 7-12 ◽  
Author(s):  
KOZO KOIDE ◽  
TOMOMI YASUDA ◽  
SHINJI IWAMOTO ◽  
EIZO FUKUDA
Keyword(s):  
Solid Particles ◽  
Bubble Columns ◽  
Gas Velocity

Critical gas velocity for suspension of solid particles in three-phase bubble columns

1992 ◽  
Vol 31 (4) ◽  
pp. 1136-1147 ◽  
Author(s):  
Mathew Abraham ◽  
Ashok S. Khare ◽  
Sudhirprakash B. Sawant ◽  
Jyeshtharaj B. Joshi
Keyword(s):  
Solid Particles ◽  
Bubble Columns ◽  
Gas Velocity ◽  
Three Phase

scholarly journals Effect of Solid Particles on the Gas Hold Up in the Fluidized Bed Columns: Experimental and Mathematical Studies

2021 ◽  
Vol 12 (4) ◽  
pp. 5004-5011
Keyword(s):  
Particle Density ◽  
Tap Water ◽  
Particle Diameter ◽  
Gas Holdup ◽  
Operating Conditions ◽  
Solid Particles ◽  
Bubble Columns ◽  
Solid Concentration ◽  
Gas Velocity ◽  
Superficial Gas Velocity

The present research investigated the effect of solid properties on the gas holdup of the fluidization bed bubble columns (FBCS). All experiments were performed in the constant clear tap water of 80 cm height. The range of solid particle diameters was 0.7 – 2 mm with two different densities of 1075 and 1200 kg/m3, superficial air velocities 4 – 7 cm/s. It was observed that there are proportional relationships between superficial gas velocity and particle diameter with the gas holdup. While an inverse relationship between solid concentration and particle density with the gas holdup. Mathematical and statistical analysis was also used as a powerful way to represent the gas hold up as a function of different operating conditions.

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.

Dual-Energy X-Ray Tomographic Measurement of Local Phase Fractions in 3-Phase Bubble Columns

2006 ◽  
Author(s):  
Martin Behling ◽  
Dieter Mewes
Keyword(s):  
Measurement Technique ◽  
Bubble Column ◽  
Dual Energy ◽  
Solid Particles ◽  
Bubble Columns ◽  
X Rays ◽  
Local Phase ◽  
X Ray ◽  
Measurement Plane ◽  
Tomographic Measurement

For measuring local phase fractions in 2- and 3-phase bubble columns, an X-ray tomographic measurement system is applied. This measurement technique, also referred to as Computer Tomography or CT, is based on the attenuation of X-rays along their path through the bubble column. An X-ray source and an X-ray detector are mounted on opposite sides of the bubble column. The bubble column is irradiated by an X-ray fan beam perpendicular to the bubble column axis. The X-ray intensity measured by each detector pixel is an integral measure for the penetrated material along the path of the X-rays. By rotating the X-ray source and X-ray detector around the bubble column axis, multiple projection measurements of the measurement plane are collected. In a second step, the phase distribution in the measurement plane (the so-called CT-slice) is calculated from the projection measurements by applying mathematical reconstruction algorithms. The reconstructed phase fractions are time-averaged over the measurement interval of 200 seconds for the measurements presented in this work. In order to distinguish all 3 phases, a special dual-energy technique is used. In this technique, 2 separate CT measurements are conducted successively, applying 2 different X-ray wavelengths. By combining the information gained from these 2 measurements, all 3 phase fractions are determined for every image pixel. The local phase fractions of all 3 phases are measured simultaneously for the whole cross-section. The measurement technique is fully non-intrusive. It is not restricted to limited ranges of phase fractions, solid loadings or flow rates of any of the phases. A 244 mm diameter, 7 m high bubble column is examined. It can be operated either with only 2 phases (liquid and gas) or with additional solid particles. Measurements are conducted with air as gas, water as liquid and PVC particles as solid phase. In this paper, the measurement principle of the tomographic technique and the dual-energy algorithm are explained. The experimental setup is described and the results of the measurements are presented.

scholarly journals Critical Gas Velocity for Complete Suspension of Solid Particles in Bubble Column.

1995 ◽  
Vol 21 (1) ◽  
pp. 196-203 ◽  
Author(s):  
Keiji Furumoto ◽  
Tetsuya Imura ◽  
Katsumi Nakao
Keyword(s):  
Bubble Column ◽  
Solid Particles ◽  
Gas Velocity

Estimation of Local Superficial Gas Velocity in Slurry Bubble Columns Using a Triple Electroresistivity Probe

2008 ◽  
Vol 41 (7) ◽  
pp. 578-584 ◽  
Author(s):  
Katsumi Nakao ◽  
Keiji Furumoto ◽  
Fumio Azakami ◽  
Toru Hasuoka ◽  
Tetsuya Imura ◽  
...  
Keyword(s):  
Bubble Columns ◽  
Gas Velocity ◽  
Slurry Bubble Columns ◽  
Superficial Gas Velocity

scholarly journals Gas Holdup and Overall Volumetric Absorption Coefficient in Bubble Columns with Suspended Solid Particles

1972 ◽  
Vol 36 (12) ◽  
pp. 1333-1337,a1 ◽  
Author(s):  
Yasuo Kato ◽  
Akio Nishiwaki ◽  
Tokihiro Kago ◽  
Takashi Fukuda ◽  
Shigenobu Tanaka
Keyword(s):  
Absorption Coefficient ◽  
Suspended Solid ◽  
Gas Holdup ◽  
Solid Particles ◽  
Bubble Columns ◽  
Suspended Solid Particles
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