Hydrodynamics and mixing characteristics in an ejector-induced downflow slurry bubble column (EIDSBC)

Sivaiah, Mekala; Majumder, Subrata Kumar

doi:10.1016/j.cej.2013.04.023

Cited by 6 publications

(5 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been found that the present experimental values of k increase with an increase in u sg and also higher than the values published in the literature. The trend of k is in accordance with the results of other investigators . At a higher superficial gas velocity (i.e., u sg > 0.05 m/s), the values of k reported by Towell, Riquarts, Reith et al, and Kato and Nishiwaki are in the same trend as those observed in the present experiment.…”

Section: Resultssupporting

confidence: 93%

“…The trend of k is in accordance with the results of other investigators. 28 At a higher superficial gas velocity (i.e., u sg > 0.05 m/s), the values of k reported by Towell, 77 Riquarts, 63 Reith et al, 95 and Kato and Nishiwaki 91 are in the same trend as those observed in the present experiment. Some typical values of the axial (at H/W = 1.63) and transverse slurry dispersion (at x/W = 1.0) coefficients, dispersion due to the bubble motion (at H/W = 1.63), dispersion due to circulation (at H/W = 1.63), the velocity distribution characteristics factor (at H/W = 1.63), and the slurry exchange parameter (at H/W = 1.63) are given in the Supporting Information (Table S3).…”

Section: Variation Of the Transverse Slurry Dispersionsupporting

confidence: 83%

“…Numerous studies are available on the mixing characteristics in the two-phase semi-batch, co-current, , downflow, and counter-current modes. ,,, The behavior of the phase flow and its interactions becomes complex when the third phase (as solid) is introduced into the column. Some mixing studies have been reported in the three-phase cylindrical columns with co-current upflow, , three-phase downflow, and counter-current flow. ,, As noticed, there is scarcity of studies regarding the mixing characteristics in the three-phase counter-current mode. Based on the literature review, this work is mainly focused on research on the hydrodynamic behavior (i.e., mixing characteristics) of a system containing two and three phases.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the studies in the literature focus on the influence of gas velocity, liquid velocity, and the column diameter, rather than the effect of particle concentration, particle size, slurry viscosity, and slurry surface tension. However, some research has been found in the literature on the dispersion behavior of slurry in the presence of particles. ,− ,− The effect of particle size, solid concentration, interfacial tension, and slurry viscosity on the axial slurry dispersion coefficient was examined in the three-phase co-current column by Kelkar et al They reported that the axial slurry dispersion coefficient was not significantly affected by the particle size and particle concentration. Ityokumbul et al reported an increase in the liquid dispersion coefficient by adding a surfactant to the liquid.…”

Section: Introductionmentioning

confidence: 99%

“…21,23,24,26 The behavior of the phase flow and its interactions becomes complex when the third phase (as solid) is introduced into the column. Some mixing studies have been reported in the three-phase cylindrical columns with co-current upflow, 5,27 three-phase downflow, 28 and counter-current flow. 5,29,30 As noticed, there is scarcity of studies regarding the mixing characteristics in the three-phase counter-current mode.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Dispersion Characteristics in a Counter-Current Microstructured Slurry Bubble Column and Its Analysis Based on the Turbulence and Circulation

Prakash

Majumder

Singh

2020

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

The slurry bubble column has gained the attention of researchers over the years because of its wide application in various processes in the chemical and mineral industries. This work aims to quantify the degree of axial and transverse slurry dispersion in a counter-current microstructured slurry bubble column within the ranges of particle concentration of 0.5–3.0 wt %, particle size of 63–408 μm, superficial gas velocity of 0.011–0.074 m/s, and slurry velocity of 0.018–0.058 m/s. The residence time distribution (RTD) technique by online conductivity measurement was used to study the dispersion phenomena at different axial and transverse positions in the column. The axial and transverse slurry dispersion coefficients were found within the ranges of 9.12–137.23 and 12.63–141.83 cm2/s, respectively. Both the coefficients increase with the superficial gas and slurry velocities and the particle diameter but decreases with the particle concentration. The transverse slurry dispersion coefficient was 3.35–38.79% higher than the axial slurry dispersion coefficient. A model was developed to interpret the intensity of the dispersion based on liquid turbulence and circulation. The dispersion due to circulation strongly depends on the slurry velocity relative to the superficial gas velocity. The degree of dispersion was also analyzed by the velocity distribution model. The present study gives insight into process intensification and modeling of the counter-current slurry bubble column.

show abstract

Section: Resultssupporting

confidence: 93%

Section: Variation Of the Transverse Slurry Dispersionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dispersion Characteristics in a Counter-Current Microstructured Slurry Bubble Column and Its Analysis Based on the Turbulence and Circulation

Prakash

Majumder

Singh

2020

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

show abstract

Characterization of Particle Fluidization in a New Type of Fluidized Bed Flotation Unit

Zhao,

2024

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

Understanding the hydrodynamics of the bed layer in a fluidized bed is essential for optimizing and improving fluidized bed flotation units. This study proposes a fluidized bed flotation column that incorporates auxiliary particles into the gas–liquid two‐phase system to address the shortcomings of traditional flotation units. Stainless steel particles (glass beads), tap water, and compressed air were used as the solid, liquid, and gas phases, respectively. Key factors affecting the bed hydrodynamics (such as bed fluctuation, minimum fluidization velocity, bed expansion, and porosity) in the fluidized column include gas and liquid flow rates as well as the initial bed height. Experimental results show that selecting appropriate filling particles can effectively enhance the fluidization performance of the bed, while appropriately increasing the gas flow rate can achieve fluidization at lower liquid velocities, thus reducing energy consumption during the flotation mineralization process. Theoretical analysis combined with extensive data reveals that the expansion characteristics of the fluidized bed and the use of high‐density filling particles can effectively mitigate bed layer fluctuations and stabilize the flow field environment. Additionally, based on a wide range of data, this study employs model factor analysis, dimensionless analysis, and multiple linear regression analysis to propose a standard dimensionless parameter model for the fluidized bed flotation column, which can effectively predict bed layer fluctuations and expansion characteristics.

show abstract

Photoreactor Design Aspects and Modeling of Light

Mazierski

Bajorowicz

Grabowska

et al. 2015

Green Chemistry and Sustainable Technology

View full text Add to dashboard Cite

Hydrodynamics and mixing characteristics in an ejector-induced downflow slurry bubble column (EIDSBC)

Cited by 6 publications

References 45 publications

Dispersion Characteristics in a Counter-Current Microstructured Slurry Bubble Column and Its Analysis Based on the Turbulence and Circulation

Dispersion Characteristics in a Counter-Current Microstructured Slurry Bubble Column and Its Analysis Based on the Turbulence and Circulation

Characterization of Particle Fluidization in a New Type of Fluidized Bed Flotation Unit

Photoreactor Design Aspects and Modeling of Light

Contact Info

Product

Resources

About