Investigation into the hydrodynamics of liquid-solid inclined micro-fluidized beds

Zhang, Yi; Ullah, Nina; Law, Richard; Reay, David; Živković, Vladimir

doi:10.1016/j.recm.2021.12.001

Cited by 2 publications

(2 citation statements)

References 38 publications

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“…Moreover, it has been discovered that an inclination of 10°leads to a greater level of solid particle mixing compared to other inclination conditions, or even the straight condition, at a constant superficial air velocity. The hydrodynamics of liquid−solid micro-fluidized beds (MFB) were examined by Zhang et al 41 in the presence of various particle-to-channel diameter ratios ranging from 0.025 to 0.165 at bed inclinations between 0 and 10°. The study on bed expansion behavior demonstrated a consistent pattern of reduced bed expansion across various particle-to-channel diameter combinations, accompanied by an elevation in the bed inclination.…”

Section: ■ Introductionmentioning

confidence: 99%

Impact of the Bend Angle on Monodisperse Particle Dynamics in an Inclination-Augmented Liquid–Solid Fluidized Bed

Puhan,

Mukherjee,

Atta

2024

Ind. Eng. Chem. Res.

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Inclination-augmented liquid−solid fluidized beds (LSFB), such as the Reflux Classifier, have been widely used in the mineral industries to isolate coal and mineral particles based on their size and density. Due to the intricacy of the liquid−solid flow and interfacial forces, the hydrodynamic behavior of an inclination-augmented LSFB exhibits greater complexity compared to that of a conventionally vertical fluidized bed. Here, we demonstrate the influence of the bend angle, defined as the angle between the vertical bottom and the inclined top section with respect to the horizontal plane, on the LSFB hydrodynamics and solid flow characteristics using a two-dimensional transient multifluid computational fluid dynamics model coupled with the kinetic theory of granular flow. The results are elaborated in terms of average solid volume fraction, length of solid suspension, pressure drop, vorticity, lateral distribution of solid horizontal velocity, vertical velocity, and solid volume fraction. The inclination angle of a LSFB augmented with inclinations notably influences bed hydrodynamics, especially at higher liquid velocities, such as when particles reach the inclined section. Increasing the bed inclination angle leads to a longer suspension length in the inclined section and a decrease in the average solid flux ratio. Bed inclination significantly alters bed pressure, with vorticity generation decreasing as the inclined top section aligns with the vertical bottom segment. While the inclination angle has no significant effect on solid horizontal velocity, it does significantly impact solid vertical velocity. Additionally, the inclination angle notably modifies the distribution of the solid volume fraction in both the lateral and vertical directions.

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Section: ■ Introductionmentioning

confidence: 99%

Impact of the Bend Angle on Monodisperse Particle Dynamics in an Inclination-Augmented Liquid–Solid Fluidized Bed

Puhan,

Mukherjee,

Atta

2024

Ind. Eng. Chem. Res.

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“…Prior to understanding the hydrodynamics of a RC, which is a combination of a straight fluidized bed and a set of parallel inclined channels at its top section, it is essential to comprehend the basics of an inclination-augmented fluidized bed, where an inclined section is attached at the top of a straight fluidized bed. The existing literature primarily focuses on the hydrodynamic analysis of straight fluidized beds, with limited research available on inclined fluidized beds that provides comprehensive insights into the hydrodynamic behavior. − Interestingly, although some published studies and reports are available on inclined fluidized beds, there were no inclined section at the top of a straight channel. Doroodchi et al, , numerically studied the expansion behavior of both mono and bidisperse solid suspensions in an inclination-augmented LSFB using ANSYS CFX.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the Influence of Key Model Parameters in Two-Fluid CFD Modeling of an Inclination-Augmented Liquid–Solid Fluidized Bed

Puhan,

Mukherjee,

Atta

2023

Ind. Eng. Chem. Res.

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To understand the dynamics of liquid–solid flow in an inclined fluidized bed such as the Reflux Classifiers, two-dimensional numerical simulations are performed by using a two-fluid Eulerian model. There are several literature reports available for conventional fluidized beds, and also a few have modeled inclined channels using computational fluid dynamics (CFD) models. However, there is still no consensus on how to choose appropriate closure models and sensitive model parameters in the CFD modeling of a liquid–solid fluidized bed containing an inclined section at the top. Here, the influences of various pertinent model parameters like interphase drag force, lift force, solid viscosity model, particle–particle restitution coefficient, and particle-wall specularity coefficient on average solid volume fraction and suspension length are thoroughly demonstrated to realize their impact on the hydrodynamic behavior. This study suggests that for an inclined fluidized bed operated in the laminar regime, choosing suitable drag models and taking lift force into account result in a significant improvement in the model predictions.

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Investigation into the hydrodynamics of liquid-solid inclined micro-fluidized beds

Cited by 2 publications

References 38 publications

Impact of the Bend Angle on Monodisperse Particle Dynamics in an Inclination-Augmented Liquid–Solid Fluidized Bed

Impact of the Bend Angle on Monodisperse Particle Dynamics in an Inclination-Augmented Liquid–Solid Fluidized Bed

Analyzing the Influence of Key Model Parameters in Two-Fluid CFD Modeling of an Inclination-Augmented Liquid–Solid Fluidized Bed

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