Novel gas holdup correlation for slurry bubble column reactors operated in the homogeneous regime

Götz, Manuel; Lefebvre, Jonathan; Mörs, Friedemann; Ortloff, Felix; Reimert, R.; Bajohr, S.; Kolb, Thomas

doi:10.1016/j.cej.2016.09.101

Cited by 42 publications

(13 citation statements)

References 69 publications

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“…Sehabiague et al proposed a gas holdup empirical correlation based on experimental work performed at high pressure and temperature for different gas mixtures and Fischer–Tropsch liquid cuts. More details about the range of application of these five correlations can be found in the work of Basha et al The last correlation found was the one proposed by Götz et al The authors were among the few authors who corrected the two‐phase gas holdup to obtain a three‐phase gas holdup as was proposed by our work. However, their correlation was developed only for a homogeneous regime.…”

Section: Resultssupporting

confidence: 54%

Simultaneous effect of particle size and solid concentration on the hydrodynamics of slurry bubble column reactors

et al. 2019

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The simultaneous effect of particle size and concentration on the total gas holdup of slurry bubble column reactors was investigated in this work. The total gas holdup was measured for air-water-glass beads systems. Three solid concentrations and three particle diameters were used. It was found that increasing particle size at high constant concentration decreases gas holdup. Moreover, increasing solid concentration decreases gas holdup and this decreasing effect is higher for larger particles. Also, solid particles have two effects on hydrodynamics, namely, changing the viscosity and density of the liquid phase as well as hindering the bubbles from rising within the column by the collision phenomenon. Therefore, a novel correcting factor was introduced to correct the gas holdup. The hindering factor considers both the collision efficiency affected by the particle size as well as the solid concentration. A novel correlation was developed to predict the experimental data of the three-phase gas holdup.

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Section: Resultssupporting

confidence: 54%

Simultaneous effect of particle size and solid concentration on the hydrodynamics of slurry bubble column reactors

et al. 2019

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“…Gas density has been observed to affect the gas holdup measured in bubble columns . In previous work, the impact of gas density was attributed to differing rates of gas coalescence and break‐up .…”

Section: Introductionmentioning

confidence: 99%

“…Bubble columns have traditionally been designed according to correlations for both the gas holdup and mass transfer coefficient . These correlations are based upon empirical observations using model systems in laboratory bubble columns, but they are needed to predict the behavior of real chemical systems in substantially larger reactors.…”

Section: Introductionmentioning

confidence: 99%

Prediction of gas density effects on bubbly flow hydrodynamics: New insights through an approach combining population balance models and computational fluid dynamics

et al. 2018

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Detailed measurements and computational fluid dynamics (CFD) investigation of the hydrodynamics in a bubble column containing internal features causing flow disturbances are presented for both air and helium gases. An optical needle probe has been used to measure profiles of bubble size, bubble velocity, and gas holdup at different locations across the cross section of the column. An approach combining CFD with population balances is able to represent observed multiphase flow phenomena such as the effect of the pipes to remix and redistribute the gas as well as the tendency of the gas to channel through a slit in the pipes rather than go around the pipes. The comparison of CFD simulation to experimental measurements reveal that the overall decrease in gas holdup observed when switching from air to helium gas can be explained by swarm effects, whereas the steeper decrease in the gas holdup profile across the column is due to coalescence effects. © 2018 American Institute of Chemical Engineers AIChE J, 64: 3764–3774, 2018

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“…Figure 5 shows the comparison of three gas holdup correlations with experimental data. Figures 5(a), 5(b), and 5(c) show the comparisons of experimental data with the calculated value predicted by (4), (5), and (7), respectively. From Figure 5(a), the prediction of (4) exhibits a large deviation caused by only considering the effect of the superficial gas velocity and neglecting the effect of the liquid-phase viscosity and rheological property, surface tension, and the diameter of the bubble column.…”

Section: Resultsmentioning

confidence: 99%

“…Thorat et al [4] have investigated the sparger design and dispersion height on fractional gas holdup in a bubble column, and the effects of sparger design, dispersion height, and gas-liquid system have also been analyzed on the basis of the drift flux model. Götz et al [5] have experimentally examined the effect of the gas, liquid, and solid properties, as well as sparger design, reactor diameter, and gas velocity, on gas holdup in slurry bubble columns and proposed a novel correlation for calculating the gas holdup in homogeneous and pseudo-homogeneous regimes.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surfactants on Gas Holdup in Shear-Thinning Fluids

Huang

Fan

2017

International Journal of Chemical Engineering

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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.

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Novel gas holdup correlation for slurry bubble column reactors operated in the homogeneous regime

Cited by 42 publications

References 69 publications

Simultaneous effect of particle size and solid concentration on the hydrodynamics of slurry bubble column reactors

Simultaneous effect of particle size and solid concentration on the hydrodynamics of slurry bubble column reactors

Prediction of gas density effects on bubbly flow hydrodynamics: New insights through an approach combining population balance models and computational fluid dynamics

Effect of Surfactants on Gas Holdup in Shear-Thinning Fluids

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