Effect of solid loading and particle size on the phase holdup distribution and bubble behaviour in a pilot-scale slurry bubble column

Mokhtari, Mojtaba; Chaouki, Jamal

doi:10.1016/j.ces.2021.116732

Cited by 13 publications

(11 citation statements)

References 30 publications

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“…In TR and BCR, more bubbles form due to the increment of U g . The smaller particles lead to enhanced bubble coalescence, which was also explained by Mokhtari and Chaouki [29], and the gas holdups diminish when the V s is above a certain level, i.e., > 0.09. The rise velocity of a large bubble is greater than that of a small bubble, and therefore, the bubble resistance time is shortened which reduces e g .…”

Section: Impact Of Particle Size On Total Gas Holdupsupporting

confidence: 54%

“…Mokhtari and Chaouki [29] found that the higher solids concentration resulted in an increase in the gas holdup in the homogeneous flow regime and a reduction in the heterogeneous regime. Orvalho et al [35] stated that increasing the concentration of solid particles reduces the gas holdup and destabilizes the homogeneous regime which agreed with our results.…”

Section: Impact Of Solid Volume Fraction On Total Gas Holdupmentioning

confidence: 99%

“…The particle properties have an impact on the hydrodynamics of the bubble column. The solid particles as a catalyst, reactant [29] or biological particle are commonly employed in industrial applications of the bubble column. Some researchers tried to study the effect of the particles on the gas holdup, but the study numbers remained low [29].…”

Section: Introductionmentioning

confidence: 99%

“…The solid particles as a catalyst, reactant [29] or biological particle are commonly employed in industrial applications of the bubble column. Some researchers tried to study the effect of the particles on the gas holdup, but the study numbers remained low [29]. Dziallas et al [30] measured the local phase holdups with an invasive sensing probe in a three-phase bubble column.…”

Section: Introductionmentioning

confidence: 99%

“…Measurement studies of the local gas holdups in the threephase systems are rare [30]. Mokhtari and Chaouki [29] summarized the methods for measuring the local solid concentrations in the slurry bubble column and they developed a new measurement technique by using optical fiber probes to determine the local solid concentrations and gas holdup simultaneously. The effects of solid loading and particle size on the phase holdup in a pilot-scale slurry bubble column were investigated and it was stated that the particles' radial and axial distributions were not uniform.…”

Section: Introductionmentioning

confidence: 99%

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Impacts of Particle Properties on Gas Holdup under Four Flow Regimes in Three‐Phase Bubble Columns

Zhou²,

Sun

et al. 2021

Chem Eng & Technol

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The impacts of the solid volume fraction V s and particle size d p on the total and local gas holdups in gas-liquid-solid bubble columns under different flow regimes were investigated. The flow regimes discussed were the discrete bubble regime (DBR), transition regime (TR), bubble coalescence regime (BCR), and strong turbulent regime (STR). The results demonstrated that the bed average gas holdup e g decreased with higher solid volume fraction in DBR, TR, and BCR. The increment of the solid volume fraction promoted bubble coalescence and also can enhance the particle effect on the average gas holdup. The e g changed slightly when shifting the V s or d p in STR. A new correlation for e g was developed considering the particle properties and the flow regimes studied.

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Section: Impact Of Particle Size On Total Gas Holdupsupporting

confidence: 54%

Section: Impact Of Solid Volume Fraction On Total Gas Holdupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Impacts of Particle Properties on Gas Holdup under Four Flow Regimes in Three‐Phase Bubble Columns

Zhou²,

Sun

et al. 2021

Chem Eng & Technol

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VOF‐DEM numerical study of mesoscale bubble dynamics in the gas‐liquid‐solid three‐phase flow system

Yu,

Yang,

Wang

2024

AIChE Journal

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Mesoscale bubble dynamics play a critical role in governing the overall performance of gas‐liquid‐solid systems. In this study, the volume of fluid method coupled with a discrete element method is utilized to scrutinize the mesoscale bubble dynamics within a gas‐liquid‐solid system featuring a dense particle bed. The results reveal that the squeezing effect of the particle bed induces a bubble pairs regime, which causes the bubble collision, coalescence and breakup, thereby generating daughter bubbles. Additionally, the combined influence of large size, flattened shape, off‐center collisions and the exists of particles facilitate bubble wakes to transform from closed into asymmetrical open patterns, further causing particles released from bubble wakes. Finally, the high‐speed region is predominantly confined to the bubble wake area, resulting in a diminished overall stirring capability compared with two‐phase system. The insights obtained from this study shed valuable light on bubble behaviors within gas‐liquid‐solid systems, offering implications for further study in this field.

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Study on a new four‐fiber sensor signal processing algorithm of hydrodynamic characteristics in liquid–liquid two‐phase flow

Yan

Xie

Chen

et al. 2022

Asia-Pacific J Chem Eng

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In the process of two‐phase countercurrent flow in the extraction column, the study of the hydrodynamic characteristics of dispersed phase droplets is crucial for the design and scaling up of the extraction column. In a pulsed extraction column with a liquid–liquid system, the four‐sensor optical fiber probe was used to assess the hydrodynamic characteristics of the dispersed phase droplets, including size, mean velocity, and holdup. 1 M HNO3 and 30% TBP/kerosene were used as continuous phase and dispersed phase, respectively. The effects of two‐phase superficial velocities and pulsation intensity were investigated on droplet size, mean velocity, and holdup. The findings show that aside from the local holdup, the pulsation intensity has the greatest impact on the hydrodynamic characteristics. A new and concise algorithm was used to deal with the light signals to determine the droplet size and mean velocity. This algorithm created two Cartesian coordinate systems, each with a separate z‐axis using the leading probe as the origin of the coordinate instead of using the vector approach. Compared to the previous algorithm, both the needed number of the time interval between the voltage peaks and that of the direction angles decrease. The relative error of the droplet size obtained by this improved algorithm is within 7%, and droplet velocity is almost the same, compared to the previous algorithm, which indicates that the new algorithm of the four‐sensor optical fiber signal processing is reliable to the measurement of the hydrodynamic characteristics.

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Effect of solid loading and particle size on the phase holdup distribution and bubble behaviour in a pilot-scale slurry bubble column

Cited by 13 publications

References 30 publications

Impacts of Particle Properties on Gas Holdup under Four Flow Regimes in Three‐Phase Bubble Columns

Impacts of Particle Properties on Gas Holdup under Four Flow Regimes in Three‐Phase Bubble Columns

VOF‐DEM numerical study of mesoscale bubble dynamics in the gas‐liquid‐solid three‐phase flow system

Study on a new four‐fiber sensor signal processing algorithm of hydrodynamic characteristics in liquid–liquid two‐phase flow

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