Particle distribution in a three-phase fluidized bed under low-to-intermediate Reynolds conditions

Knesebeck, Alexandre; Guardani, Roberto

doi:10.1016/j.powtec.2003.12.013

Cited by 3 publications

(3 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Glass beads are used because of their high strength, enhanced processing, chemical stability, low oil absorption, minimal thermal expansion, good flowability, and colorless glass. Knesebeck et al [35] investigated the particle size distribution along with the bed height when fluidized solid particles with a wide size distribution. The concentration profiles of particles of each size class were determined at various liquid and gas velocities by obtaining suspension samples at different axial and radial locations.…”

Section: Hydrodynamic On Gas-liquid-solid Fluidizationmentioning

confidence: 99%

Recent Development in Hydrodynamic and Heat Transfer Characteristics in the Three-phase Fluidized-bed System

Mahdy¹,

Abdulrahmn²,

Ali³

2022

ETJ

View full text Add to dashboard Cite

The effect of several characteristics on hydrodynamic performance and heat transfer phenomena has been studied extensively.  A review of most of the previous correlations for various parameters in gas-liquid-solid fluidization systems was investigated. CFD could be used to understand the complicated hydrodynamics of fluidization Gas-liquid-solid fluidized beds are broadly utilized in the petrochemical, pharmaceutical, refining, food, biotechnology, and environmental industries. Due to complex phenomena, such as the particle-particle, liquid-particle, particlebubble interactions, complex hydrodynamics, and heat transfer of three-phase (gas-liquid-solid) fluidized beds, they are incompletely understood. The ability to accurately predict the essential characteristics of the fluidized-bed system, such as hydrodynamics, individual phase mixing, and heat transfer parameters, is necessary for its successful design and operation. This paper investigates the pressure drop, minimum fluidization velocity, phase holdup, heat-transfer coefficient of a fluidized bed reactor, heat transfer studies, CFD simulation, and the effect of these parameters on the extent of fluidization. Many variables (fluid flow rate, particle density and size, fluid inlet, and bed height) affect the fluidizing quality and performance of the fluidization process. The hydrodynamics parameters, mixing of phases, and the behavior of heat transfer with various modes of fluidization were investigated to predict hydrodynamics parameters. Several publications have demonstrated the utility of (CFD) in explaining the hydrodynamics, heat, and mass transfer of fluidized beds. Principles of measurement, details of the experimental configurations, and the applied techniques by various researchers are also presented. Feng's model was statistically validated using experimental data that was both time-averaged and time-dependent. Furthermore, this model successfully predicted the instantaneous flow structures, which should provide strategies for the best design, scale-up, and operation in fluidized bed columns. The divergence between the simulated and observed values can be reduced by better understanding the fluidized bed's nature.

show abstract

Section: Hydrodynamic On Gas-liquid-solid Fluidizationmentioning

confidence: 99%

Recent Development in Hydrodynamic and Heat Transfer Characteristics in the Three-phase Fluidized-bed System

Mahdy¹,

Abdulrahmn²,

Ali³

2022

ETJ

View full text Add to dashboard Cite

show abstract

“…It could contribute substantially to surface treatment of medical tablets, production of carbon nanotubes, , sulfur capture in energy production, − solids and catalyst attrition and modification, − and degradation of metal oxide used as oxygen carrier chemical vapor deposition, , foodstuff and grain conditioning, and particle distributions in reactors . The importance of sampling can be deduced from the large number of patents in this area .…”

Section: Introductionmentioning

confidence: 99%

“…25 Process history would be quite useful for the attrition resistance tests of catalysts used in fluidized-bed and slurry-phase types of reactors, 24 chemical vapor deposition, 26,27 foodstuff and grain conditioning, 28 and particle distributions in reactors. 29 The importance of sampling can be deduced from the large number of patents in this area. 30 In long-duration experimental and commercial reactors, reaction history would be valuable for quality control and troubleshooting.…”

Section: Introductionmentioning

confidence: 99%

A Simple Sampling Method for the Reaction History in Fluidized or Transport Reactors

Hastaog̃lu

2004

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

A sampling technique has been developed to store the reaction history in fluidized- or moving-bed reactors. A sampling tube placed in the reactor that collects solid pellets can be analyzed to determine solid conversion, catalyst deactivation, structural changes, etc., along the tube; this information is translated into reactor history through the rate of solids collection. Use of this technique can significantly reduce the number of samples required. The concept was tested for the room-temperature drying of solid pellets, an air-fluidized ion-exchange bed, and liquid−solid and air−solid fluidized-bed operations. The theoretical and experimental results verified the idea. This technique could find application in a variety of areas, including waste treatment, metallurgy, energy production, petrochemical processes, surface treatment of medical tablets, production of carbon nanotubes, etc.

show abstract

Examination of particle motion in fluidized bed flotation columns: Effect of particle shape

Han,

Chen,

Gui

et al. 2024

Powder Technology

View full text Add to dashboard Cite

Particle distribution in a three-phase fluidized bed under low-to-intermediate Reynolds conditions

Cited by 3 publications

References 27 publications

Recent Development in Hydrodynamic and Heat Transfer Characteristics in the Three-phase Fluidized-bed System

Recent Development in Hydrodynamic and Heat Transfer Characteristics in the Three-phase Fluidized-bed System

A Simple Sampling Method for the Reaction History in Fluidized or Transport Reactors

Examination of particle motion in fluidized bed flotation columns: Effect of particle shape

Contact Info

Product

Resources

About