scholarly journals Critical gas velocity required for complete suspension of multicomponent solid particle mixture in solid-suspended bubble columns with and without draught tube.

1986 ◽  
Vol 19 (4) ◽  
pp. 341-344 ◽  
Author(s):  
KOZO KOIDE ◽  
MAKOTO TERASAWA ◽  
HIROSHI TAKEKAWA
Keyword(s):  
Solid Particle ◽  
Bubble Columns ◽  
Gas Velocity ◽  
Draught Tube ◽  
Particle Mixture

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.

scholarly journals Contributions of annulus and draught tube to gas-liquid mass transfer in bubble columns with draught tube.

1984 ◽  
Vol 17 (5) ◽  
pp. 547-549 ◽  
Author(s):  
KOZO KOIDE ◽  
KAZUYOSHI HORIBE ◽  
HISATSUGU KITAGUCHI ◽  
NORIAKI SUZUKI
Keyword(s):  
Mass Transfer ◽  
Bubble Columns ◽  
Draught Tube ◽  
Liquid Mass ◽  
Liquid Mass Transfer

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 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

Study of the Hydrodynamics and Mass Transfer Coefficient in a 2D Mimicked FT Slurry Bubble Columns for Alternative Clean Energy and Chemical Production

2016 ◽  
Vol 14 (5) ◽  
pp. 975-990
Author(s):  
Hiba A. Abdulkareem ◽  
Saba A. Gheni ◽  
Rafi’ J. Yacoup
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Perforated Plate ◽  
Silica Particles ◽  
Gas Holdup ◽  
Diameter Ratio ◽  
Bubble Columns ◽  
Solid Loading ◽  
Gas Velocity

Abstract Bubble columns are widely used for contacting gas–liquid and gas–liquid–solid mass transfer/chemical reactions. Gas distributor is the most important accessory because it decides the bubble size/rise velocity and gas distribution. In this study, the effect of distributor design on hydrodynamics and mass transfer coefficient are studied at different operating conditions of height to diameter ratio, solid loading, and superficial gas velocity The overall gas holdup, is studied experimentally using a rectangular slurry bubble column operating at ambient temperature and pressure, using liquid paraffin (C9–C11), three heights to diameter ratios (6, 7.5 and 10) and silica as a solid phase (0 %, 9 % and 25 %) with oxygen as gas phase. Two types of distributor were used, perforated plate and ring type. The results showed that the overall gas holdup increased by increasing gas velocity and decreased by increasing height to diameter ratio and solid loading. Also, it is found that the perforated plate distributor gave a higher gas hold up than ring distributor at gas velocity higher than 0.03 m/sec. The following correlations are obtained: Plate distributor at presence of silica particles: $$\eqalign{{{\rm{\varepsilon}}_{\rm{g}}} =& {\left({1.343{\rm{U}}_{\rm{g}}^{0.0612} - 0.00891{\rm{\varepsilon}}_{\rm{s}}^{- 0.374} - 0.702{{\left({{{\rm{L}} \over {\rm{D}}}} \right)}^{0.041}}} \right)^{4.904}}\cr& - 0.0251}$$ Ring distributor at presence and absence of silica particles: $$\eqalign{{{\rm{\varepsilon}}_{\rm{g}}} = &{\left({0.216{\rm{U}}_{\rm{g}}^{0.297} - 0.354{\rm{\varepsilon}}_{\rm{s}}^{1.4671} - 0.127{{\left({{{\rm{L}} \over {\rm{D}}}} \right)}^{0.147}}} \right)^{1.1206}} \cr&+ 0.058}$$ There is a good agreement between experimental and predicted values with a percent of error less than 2 %. It has been found that the mass transfer coefficient is higher for ring distributor than the perforated plate and growing higher for heterogeneous flow regime and higher solid loading.

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
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