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

Lakhdissi, El Mahdi; Soleimani, Iman; Guy, Christophe; Chaouki, Jamal

doi:10.1002/aic.16813

Cited by 29 publications

(35 citation statements)

References 42 publications

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“…Regarding the effects of solid size on the gas hold-up, Rabha et al [37], for instance, reported that at low values of solid size and concentration, the particle size cannot affect gas hold-up while at higher values of solid concentration and size, increasing the solid size decreases the gas hold-up. The same results were also reported by Lakhdissi et al [23]. On the other hand, the experiments of Li et al [50] revealed that increasing the solid size cannot affect the gas hold-up even for high concentrations of solid (up to 40 vol %).…”

Section: Flow Regimesupporting

confidence: 85%

“…Lakhdissi et al [23] studied the effects of particle concentration and size on the gas hold-up in an air-water-glass beads systems. Their experiments showed that at a constant solid concentration, increasing the solid size had no influence on the total gas hold-up at low solid concentrations (up to 3 % (v/v)) while increasing the solid size leads to decreasing gas hold-up at the higher solid particle's concentrations (5 % (v/v)).…”

Section: Flow Regimementioning

confidence: 99%

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Effect of Solid Particles on the Slurry Bubble Columns Behavior – A Review

Mahmoudi

Hlawitschka

2021

ChemBioEng Reviews

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A wide-ranging review is presented on the most focal aspects of gas-liquid-solid reactors to discuss the fresh headways towards the understanding of slurry bubble column reactors' behavior. In more detail, in this critical review, published works' findings concerning the effects of solid particles characteristics (size, concentration and density) on volumetric mass transfer coefficient, liquid-side mass transfer coefficient, gas-liquid interfacial area, gas hold-up and flow regime are deliberated. Besides, the effects of other pivotal parameters such as pressure, temperature, reactor size, height of liquid, gas distributor, density, and viscosity on the performance of slurry bubble column reactors are considered. Eventually, regarding the effects of each of the aforementioned parameters on the performance of reactor, logical conclusions are drawn.

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Section: Flow Regimesupporting

confidence: 85%

Section: Flow Regimementioning

confidence: 99%

Effect of Solid Particles on the Slurry Bubble Columns Behavior – A Review

Mahmoudi

Hlawitschka

2021

ChemBioEng Reviews

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“…Different researchers have reached different conclusions on the effect of superficial gas velocity on bubble size: with the increase of superficial gas velocity, bubble size increases, 10−12 decreases, 13,14 or has no obvious change. 15,16 In addition, solid particles can affect bubble dynamics by changing the viscosity and density of the liquid phase and the collision strength between bubbles and particles: 17 the increase in particle concentration promotes bubble coalescence by increasing the viscosity of the slurry. 18 Ojima et al 19 attributed the enhancement of bubble coalescence when the particle size decreases to an increase in the number density of particles in the liquid film around the bubble, while Lakhdissi et al 17 attributed it to a decrease in bubble−particle collision efficiency.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Bubble Size Distribution above the Bubble-Breaking Plate

Wang

Zeng

et al. 2023

Ind. Eng. Chem. Res.

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The chord length distribution (CLD) of bubbles in the region above the bubble-breaking plate in the scrubbing−cooling chamber was studied experimentally using a conductivity probe. The predictive correlations of the shape parameters were established by fitting the CLD with a distribution function. The bubble shape was discussed, and the CLD was analytically converted to the size distribution of the direct contact of the probe. The results showed that the CLD has specific right-skewed characteristics, and the Rayleigh distribution has the best-fitting effect on the CLD. The correlation equation of the shape parameter k of the Rayleigh distribution concerning the Fr number, local gas holdup ε g , and dimensionless radius r/R was established. The predicted bubble size distributions (BSDs) based on ellipsoids are in good morphological agreement with the experimental size distributions. The relative error between the calculated and experimental values of the gas−liquid interface area was within ±20%, which verified the accuracy of the prediction of the BSD.

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“…It was concluded that the bubble size distribution at the inlet of the column did not affect the distribution inside the column. Lakhdissi et al [17] investigated the impact of particle diameter and concentration on gas holdup for a slurry bubble column. The process consisted of three phases (air, water, and glass beads).…”

Section: Introductionmentioning

confidence: 99%

“…However, the holdup was independent at higher concentrations. They also mentioned that, in general, increasing the solids concentration reduces the gas holdup and therefore increases the bubble diameter [17]. Rabha et al [19] examined the effect of particle size (50-150 µm) and solids concentration Cs of (0-0.20) on the hydrodynamics of a slurry bubble column by utilizing ultrafast electron beam X-ray tomography.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Optimization of the Dispersion of Mixing Particles in an Inert-Particle Spouted-Bed Reactor (IPSBR) System

et al. 2021

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Effective gas dispersion and liquid mixing are significant parameters in the design of an inert-particle spouted-bed reactor (IPSBR) system. Solid particles can be used to ensure good mixing and an efficient rate of mass and heat transfer between the gas and liquid. In this study, computational fluid dynamics (CFD) coupled with the discrete phase model (DPM) were developed to investigate the effect of the feed gas velocity (0.5–1.5 m/s), orifice diameter (0.001–0.005 m), gas head (0.15–0.35 m), particle diameter (0.009–0.0225 m), and mixing-particle-to-reactor-volume fraction (2.0–10.0 vol.%) on the solid mass concentration, average solid velocity, and average solid volume fraction in the upper, middle, and conical regions of the reactor. Statistical analysis was performed using a second-order response surface methodology (RSM) with central composite design (CCD) to obtain the optimal operating conditions. Selected parameters were optimized to maximize the responses in the middle and upper regions, and minimize them in the conical region. Such conditions produced a high interfacial area and fewer dead zones owing to good particle dispersion. The optimal process variables were feed gas velocity of 1.5 m/s, orifice diameter of 0.001 m, gas head of 0.2025 m, a particle diameter of 0.01 m, and a particle load of 0.02 kg. The minimum average air velocity and maximum air volume fraction were observed under the same operating conditions. This confirmed the novelty of the reactor, which could work at a high feed gas velocity while maintaining a high residence time and gas volume fraction.

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

Cited by 29 publications

References 42 publications

Effect of Solid Particles on the Slurry Bubble Columns Behavior – A Review

Effect of Solid Particles on the Slurry Bubble Columns Behavior – A Review

Prediction of Bubble Size Distribution above the Bubble-Breaking Plate

Comprehensive Optimization of the Dispersion of Mixing Particles in an Inert-Particle Spouted-Bed Reactor (IPSBR) System

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