Minimum fluidization velocity of binary mixtures

Chyang, Chien-Song; Kuo, Chen-Chung; Chen, May-Yann

doi:10.1002/cjce.5450670222

Cited by 22 publications

(3 citation statements)

References 9 publications

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“…The various variables involved are: 1-size of the small size particles(ds),2-size of the big size particle (db), 3density of small size particles(ρss), 4-density of big size particle(ρsb), 5-minimum fluidization velocity (Gmf), 6operating fluidization velocity(G), 7-total height of bed(ht) and 8-diameter of the column (Dc). hs is the height of small si2ze particles (1,2,3,4,5).…”

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confidence: 99%

“…In many cases, distinct degrees of mixing or segregation are required. The fluidization behaviour of multicomponent particle beds has been the subject of a large number of experimental investigations in the last few decade (1)(2)(3)(4)(5) . This persistent research effort is motivated by the technical and economic importance of the industrial processes which contemplate the simultaneous contact of a gaseous stream with two or more solids.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Analysis of the Fluidization of Binary Solid Mixtures

2024

IRJMETS

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The characterization of the segregation phenomenon in mixture of solids with very different densities and particle sizes is highly relevant in many industrial processes, which are the most relevant for the design of future continuous separation of solids by Segregation. Screening, Froth Floatation, Jigging, Cyclone Separators used to separate mixtures of materials. In the present work an attempt has been made to separate solid mixtures of various sizes and densities via fluidization. The experiments work performed fluidized bed consists of Column inner diameter is 0.019 m and column length1.0 m. The materials used are: sand particle size range 0.21-0032, particle density 1.40-1.70. Bengal gram particle size 0.21-0.039, particle density 1.10-1.20. Dolomite particle size0.308-0.024, particle density 2.7-2.90. Mustard seeds particle size 0.155-0.513, particle density 0.43. Steel balls particle size 0.774 -0.21, particle density 7.30-7.80.Berry seeds 0.84 -0.57, particle density 1.05-1.10. Glass beeds particle size0.786 -0.51 particle density 2.10-2.60. Sodium chloride particle size-0.308-0.032 particle density 2.163. Based on dimensional analysis and experimentation, the equations are created and the separation amount is calculated. It is observed that percent of the error found to be 14.

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Section: Write the Above Equation Inmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of the Fluidization of Binary Solid Mixtures

2024

IRJMETS

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“…With the advent of the 21st century, researchers (Zhang et al, 2006) emphasized the need for studies on the bed dynamics of the Geldart B type of particles and binary mixtures. Furthermore, experimental studies on binary mixtures gained importance at the end of the 20th century (Noda et al, 1986;Chyang et al, 1989) because the bed dynamics differed from the single-particle beds. In fluidized beds with binary systems, the fraction that mostly forms the top layer of the bed or the one that floats is called the flotsam, and the one at the bottom layer or the one that sinks is called the jetsam.…”

Section: Introductionmentioning

confidence: 99%

CFD simulations to study bed characteristics in gas–solid fluidized beds with binary mixtures of Geldart B particles: II quantitative analysis

Ganguli

Bhatt

2023

Front. Energy Res.

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Hydrodynamics of fluidized beds with binary mixtures of particles is important in many industrial applications. The binary particles are generally in the Geldart particle range. In our earlier work, (Part I) of this work simulations were carried out and qualitative analysis was presented. Quantitative predictions of gas velocity and particle velocity profiles have been presented in the present work, which is Part II of the two-part work on computational fluid dynamics (CFD) simulations of binary fluidized beds. It was observed that the dynamics of the bed vary for different binary mixtures and are a strong function of superficial velocity and bed height. Mixing and segregation in beds for two different initial bed heights and six different binary mixtures and superficial velocities have been identified. Segregation is prominent for binary mixtures with 20 wt.% and 80 wt.% of large particles, whereas mixing is observed in 40 wt.% and 60 wt.% large particle mixtures. Bypassing of gas near the walls is prominently seen for 60 wt.% large particles with gas velocities as high as 5 m/s. Time-averaged axial particle volume fractions have been observed to be lower in the dilute phase with large undulations in the middle whenever the bed is well mixed for central axial profiles. The axial volume fraction profiles also confirm the mixing and segregation for the 40 wt.% and 20 wt.% composition of large particles for the operating conditions considered for the study. Bed height expansion is linear until a certain superficial velocity with the increase or decrease depending on the superficial velocity or bed height of operation. Furthermore, correlations for minimum fluidization velocity and pressure drops from the literature have been compared with experimental results. The simulated data have been considered for the development of a correlation for minimum fluidization velocity. The predicted results match experimental data with a 10%–15% deviation.

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Prediction of pressure fluctuations and minimum fluidization velocity of binary mixtures of geldart group b particles in bubbling fluidized beds

Leu

2000

Can J Chem Eng

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A simple method was proposed to find the pressure fluctuations of binary systems of Geldart Group B particles under bubbling fluidized bed conditions. The pressure fluctuations of binary systems could be predicted from the pressure fluctuations of the individual particles component which comprised the binary systems for completely mixed and partially mixed systems. The predicted pressure fluctuations could be used to calculate the minimum fluidization velocity of the binary systems. The predicted and experimental values of pressure fluctuations and the minimum fluidization velocity of binary systems were in fairly good agreement.

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Minimum fluidization velocity of binary mixtures

Cited by 22 publications

References 9 publications

Experimental Analysis of the Fluidization of Binary Solid Mixtures

Experimental Analysis of the Fluidization of Binary Solid Mixtures

CFD simulations to study bed characteristics in gas–solid fluidized beds with binary mixtures of Geldart B particles: II quantitative analysis

Prediction of pressure fluctuations and minimum fluidization velocity of binary mixtures of geldart group b particles in bubbling fluidized beds

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