Particle-scale study of spout deflection in a flat-bottomed spout fluidized bed

Yue, Yuanhe; Wang, Tianyu; Sakai, Mikio; Shen, Yansong

doi:10.1016/j.ces.2019.04.031

Cited by 62 publications

(22 citation statements)

References 55 publications

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“…In this paper, the CFD-DEM approach is used to study the effect of key operating variables on the gas–solid flow hydrodynamics and spout deflection in a two-dimensional (2D) spout-fluidized bed. The approach is well established and has been verified in our previous paper . The typical phenomenon of the spout deflection process is introduced.…”

Section: Introductionmentioning

confidence: 82%

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Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Yue

Shen

2019

Ind. Eng. Chem. Res.

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Spout deflection is a common instability phenomenon in spout-fluidized beds. The hydrodynamics of spout deflection under several key operating variables, including static bed height (H 0), background velocity (U bg), and reactor column width (W), is investigated by means of the computational fluid dynamic-discrete element method (CFD-DEM) coupling approach. The results show that non-alternating spout deflection can be easily observed when the H 0 is larger than 236 mm or the W is less than 0.14 m in this study. For alternating spout deflection, first, there is an upper limit for its amplitude because of the self-locking phenomenon in the bottom corner. Large W promotes the regularity, while the effects of H 0 on regularity is neglectable. Thirdly, the main frequency of the alternating spout deflection reduces with increasing H 0 and increasing U bg and finally stabilizes at 1.7 Hz. This study sheds light on the design, optimization, and operation of spout-fluidized beds.

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Section: Introductionmentioning

confidence: 82%

“…The CFD-DEM coupling approach is developed and validated in our previous paper . It is outlined below for completeness.…”

Section: Methodsmentioning

confidence: 99%

Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Yue

Shen

2019

Ind. Eng. Chem. Res.

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“…Contact Interaction: Linear Spring-Dashpot-Slider Model 3.3.1. Constant Absolute Overlap Models One of the most detailed treatment and extensive application of the coarse graining procedure with the linear contact model was given by Sakai and coworkers, who introduced it to model a pneumatic conveying line [23] and later applied it for several fluidized bed cases [61][62][63][64][65][66]. They based their derivation on imposing the conservation of the typical energy contents of the particle/grain system before and after the collisions.…”

Section: Porous Grainsmentioning

confidence: 99%

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

2021

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In the last decade, a few of the early attempts to bring CFD-DEM of fluidized beds beyond the limits of small, lab-scale units to larger scale systems have become popular. The simulation capabilities of the Discrete Element Method in multiphase flow and fluidized beds have largely benefitted by the improvements offered by coarse graining approaches. In fact, the number of real particles that can be simulated increases to the point that pilot-scale and some industrially relevant systems become approachable. Methodologically, coarse graining procedures have been introduced by various groups, resting on different physical backgrounds. The present review collects the most relevant contributions, critically proposing them within a unique, consistent framework for the derivations and nomenclature. Scaling for the contact forces, with the linear and Hertz-based approaches, for the hydrodynamic and cohesive forces is illustrated and discussed. The orders of magnitude computational savings are quantified as a function of the coarse graining degree. An overview of the recent applications in bubbling, spouted beds and circulating fluidized bed reactors is presented. Finally, new scaling, recent extensions and promising future directions are discussed in perspective. In addition to providing a compact compendium of the essential aspects, the review aims at stimulating further efforts in this promising field.

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“…The air distributor is generally located behind the gas inlet, and the gas flowing into the equipment is evenly distributed in the bed through the redistribution of the air distributor, which can effectively improve the mixing efficiency of gas-solid two-phase and enhance the controllability of equipment operation [55,64]. The effects of operating conditions such as superficial gas velocity [2-3, 16, 22, 30, 39, 44, 54-55, 65-67], bed height [3,66] and feed position [7,20] on particle distribution, separation efficiency and residence time in fluidized bed can not be ignored. The application of these variables to numerical simulation can realize the organic combination of numerical simulation and experimental research, and the obtained results can effectively predict the flow field inside the equipment during actual operation.…”

Section: Gas-solid Flow Characteristicsmentioning

confidence: 99%

Research Progress on Numerical Simulation of Two-phase Flow in the Gas-solid Fluidized Bed

et al. 2021

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It is difficult to accurately measure the parameters of solid particles in the experiment of the gas-solid fluidized bed. The numerical simulation plays an important role to accurately describe flow characteristics in the fluidized bed. Combined with the research work of the research group, this paper analyzes the application of numerical simulation of fluidized bed from the aspects of gas-solid coupling algorithm, drag model, flow characteristics, and reaction characteristics based on the previous studies. The specificity improvement of the gas-solid coupling algorithm and the regional application of the drag model is the trend of the recent development of numerical simulation. Previous studies mainly focus on the gas-solid two-phase flow field characteristics in the traditional fluidized bed, but few on the complex flow characteristics such as gas-solid reverse flow and the coupling with reaction characteristics. It is of great significance for designing a novel fluidized bed reactor to realize gas-solid continuous reaction to establish and improve the numerical simulation method of gas-solid non-catalytic reaction.

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Particle-scale study of spout deflection in a flat-bottomed spout fluidized bed

Cited by 62 publications

References 55 publications

Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

Research Progress on Numerical Simulation of Two-phase Flow in the Gas-solid Fluidized Bed

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