Slug characteristics of polymer particles in a gas-solid fluidized bed

Lee, See Hoon; Lee, Dong Hoon; Kim, Sang Done

doi:10.1007/bf02698428

Cited by 11 publications

(5 citation statements)

References 13 publications

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“…Figure compares the prediction of the proposed model for maximum slugging frequency with the experimental data. The predictions using the correlations given by Lee et al and Shichen et al are also shown. The computation of f Ms using the Lee et al and Shichen et al correlations are obtained at the superficial gas velocity corresponding to the gas velocity U ms at the onset of slugging.…”

Section: Resultsmentioning

confidence: 74%

“…From the previous studies, − different correlations for predicting slugging frequency within the slugging regime are provided. However, there are no such correlations found for the maximum slugging frequency.…”

Section: Resultsmentioning

confidence: 99%

“…The predictions using the correlations given by Lee et al 30 and Shichen et al 31 was based. The Shichen et al correlation underpredicts the experimental data including those of 697 μm limestone and 624 μm glass particles even though the model was developed based on a particle size of 650 μm.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

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Investigation of Bubbling Behavior in Deep Fluidized Beds at Different Gas Velocities using Electrical Capacitance Tomography

Agu

Ugwu

Pfeifer

et al. 2019

Ind. Eng. Chem. Res.

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Deep bubbling fluidized beds have some advantages that make them attractive for industrial applications. Using different powders, this paper investigates the bubbling behavior in deep beds. The results show that bubbles grow faster in the bed of angular/rough particles than in that of round/smooth particles and that the rate of bubble growth increases with increase in the particle size. With an increase in the bed height, the changes in the bubble diameter and solids distribution decrease within the bubbling regime but may vary within the slugging regime due to the chaotic behavior of slug flows. The bubble frequency increases with an increase in the gas velocity only when the bubble diameter is below a certain threshold value; for larger bubbles, the bubble frequency is lower. The maximum bubble frequency indicates the onset of slugging. Correlations for predicting the maximum bubble/slugging frequency averaged over the bed height and the corresponding bubble diameter are proposed.

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Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

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Investigation of Bubbling Behavior in Deep Fluidized Beds at Different Gas Velocities using Electrical Capacitance Tomography

Agu

Ugwu

Pfeifer

et al. 2019

Ind. Eng. Chem. Res.

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“…Some research focused on slugs in liquid, for instance Ormiston et al (1965). Round nosed slugs were further studied by Stewart and Davidson (1967), Kehoe and Davidson (1970), Baeyens and Geldart (1974), Fan et al (1983) and Lee et al (2002). The expressions for slugs in liquid were also applied to slugs in fluidized beds of particles.…”

Section: Plug Velocitymentioning

confidence: 99%

“…Lee and Kim (1989) followed this derivation but found a slightly different expression for k 1 , based on a fit of experimental results. Lee et al (2002) found that the rise velocity of slugs was dependent on the bed height due to slug coalescence. They work with powders that cause square nosed slugging and report, in accordance with findings of Noordergraaf et al (1987), that the velocity of square nosed slugs is lower than the superficial gas velocity.…”

Section: Plug Velocitymentioning

confidence: 99%

Fluidization behavior in a circulating slugging fluidized bed reactor. Part II: Plug characteristics

Putten¹,

Annaland²,

Weickert³

2007

Chemical Engineering Science

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Gas–liquid mass transfer in three‐phase inverse fluidized bed reactor with Newtonian and non‐Newtonian fluids

Sivasubramanian

2009

Asia-Pacific J Chem Eng

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Liquid-phase volumetric mass transfer coefficients, k L a were determined in three-phase inverse fluidized beds of low-density polyethylene (LDPE) and polypropylene (PP) spheres fluidized by a countercurrent flow of air and Newtonian (water and glycerol solutions) or non-Newtonian liquids [carboxy methyl cellulose (CMC) solutions]. The effects of liquid and gas velocities, particle size, solid loading and addition of organic additives (glycerol and CMC) on the volumetric mass transfer coefficient, k L a were determined. The superficial liquid velocity had a weak effect on the mass transfer whereas the gas flow rate affected the mass transfer positively. k L a increased with increase in particle diameter and decreased with increase in initial bed height (solid loading). k L a decreased as the concentration of glycerol (viscosity) and CMC increased. Empirical correlations are presented to predict the gas-liquid volumetric mass transfer coefficient in terms of operating variables. 

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Slug characteristics of polymer particles in a gas-solid fluidized bed

Cited by 11 publications

References 13 publications

Investigation of Bubbling Behavior in Deep Fluidized Beds at Different Gas Velocities using Electrical Capacitance Tomography

Investigation of Bubbling Behavior in Deep Fluidized Beds at Different Gas Velocities using Electrical Capacitance Tomography

Fluidization behavior in a circulating slugging fluidized bed reactor. Part II: Plug characteristics

Gas–liquid mass transfer in three‐phase inverse fluidized bed reactor with Newtonian and non‐Newtonian fluids

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