Experimental Study and DEM Numerical Simulation of Dry/Wet Particle Flow Behaviors in a Spouted Bed

Tang, Tianqi; He, Yaning; Ren, Anxing; Wang, Tianyu

doi:10.1021/acs.iecr.9b02448

Cited by 23 publications

(14 citation statements)

References 55 publications

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“…This is similar with group C particles . Similar results have been extensively reported. , The abovementioned trend is caused by the combined effect of the liquid bridge force and gas–solid drag force . In view of the whole bed, the drag force tends to fluidize the particles, whereas the liquid bridge force is prone to bond the particles together, maintaining the bed in a stable manner.…”

Section: Introductionsupporting

confidence: 90%

“…7,8 The abovementioned trend is caused by the combined effect of the liquid bridge force and gas−solid drag force. 9 In view of the whole bed, the drag force tends to fluidize the particles, whereas the liquid bridge force is prone to bond the particles together, maintaining the bed in a stable manner. Because the liquid bridge force imposes in various directions, it is difficult to perform a force balance analysis to interpret the bed behaviors.…”

Section: Introductionmentioning

confidence: 99%

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Distinguishing Liquid Transport Patterns during the Fluidization of Wet Particles with Bed Expansion Behaviors

Pan

Liu

2020

Ind. Eng. Chem. Res.

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The liquid transport pattern in a fluidized bed of wet particles influences the global fluidization dynamics. This paper proposed a method for distinguishing liquid transport patterns according to the bed expansion behaviors at incipient fluidization. The results show that the average bed expansion ratio increases first and then decreases with increasing ratio of liquid to solid (L/S ratio), corresponding to the free-liquid regime and trapped-liquid regime, respectively. The L/S ratio at the largest expansion ratio, Λc, is the critical value distinguishing both regimes. The critical L/S ratio increases with particle diameter while decreases with the liquid surface tension. The liquid viscosity has negligible impacts on the bed expansion and the critical L/S ratio. Finally, a regime map was drawn combining the bond number Bo and L/S ratio, and a correlation between Λc and Bo was fitted: Λc = −Bo/10,000 + 0.0111. This may help choose operating parameters according to the desired liquid transport pattern.

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Section: Introductionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Distinguishing Liquid Transport Patterns during the Fluidization of Wet Particles with Bed Expansion Behaviors

Pan

Liu

2020

Ind. Eng. Chem. Res.

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“…In this work, the CFD-DEM approach is implemented to describe gas−solid flow behaviors in a wet-particle fluidized bed. 15 The governing equations of the gas phase are expressed as follows…”

Section: Cfd-dem Approachmentioning

confidence: 99%

“…The results revealed that the double water injection caused more liquid volumes on the particles, leading to an increase in contact duration. Tang et al 15 Most studies about wet-particle systems neglect the particle shape effect and spherical particles are assumed. In practical processes, a majority of the particles are nonspherical.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the Fluidization Behavior of Nonspherical Wet Particles with Liquid Transfer

Wang

2022

Ind. Eng. Chem. Res.

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Many industrial processes involve wet-particle systems. Particle shape influences the liquid transfer and interaction between particles in wet-particle systems. In this work, a spouted fluidized-bed system with nonspherical wet particles is investigated, where the liquid transfer model is implemented in the CFD-DEM framework to consider the redistribution of liquid content after the collision of nonspherical wet particles. The behaviors of spherical and nonspherical wet particles in a spouted fluidized bed are compared. The results demonstrate that nonspherical wet particles can strengthen the liquid bridge force and particle agglomeration in contrast to spherical wet particles. The liquid transfer results in a clear discrepancy of liquid content on the particle surface. The multiple contacts with neighboring particles inside the agglomeration reduce the liquid content on the particle surface, which is enhanced under a higher aspect ratio.

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“…The second one is computational fluid dynamics coupled with the discrete element method (CFD-DEM), − which tracks the solid phase at the particle-scale level and handles particle collision events through a soft-sphere collision model . However, this high-fidelity numerical method requires numerous computational resources for tracking the solid phase, and thus the majority of the available studies have been carried out for small-scale risers of the CFB with a limited particle number. − …”

Section: Introductionmentioning

confidence: 99%

Shape Effect of the Riser Cross Section on the Full-Loop Hydrodynamics of a Three-Dimensional Circulating Fluidized Bed

Yang

Wang

2020

ACS Omega

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In this work, numerical simulation is carried out in a threedimensional full-loop pilot-scale circulating fluidized bed to explore the shape effect of the riser cross section on the typical flow characteristics of the bed via the multiphase particle-in-cell (MP-PIC) method. The gas and solid phases are modeled with the large eddy simulation and Newton's law of motion in the Eulerian and Lagrangian frameworks, respectively. The proposed model has been well validated with experimental data, followed by evaluating the typical core−annulus structure and the nonuniformity of the solid phase distributed along the radial and axial directions of the riser. Then, the particle-scale information of the solid phase distributed in different parts of the system is explored. The results demonstrate that (i) the square riser gives rise to a higher solid inventory in the standpipe owing to the stronger circulation intensity; (ii) the thickness of the solid back-mixing layer reduces along the riser height; the solid back-mixing tends to concentrate in the four corners, while it is not obvious near the sidewalls of the square riser; and (iii) nonuniform distribution of the particle-scale information of the solid phase (e.g., mass, flux, drag force, and slip velocity) can be observed. The square riser gives rise to comparatively more uniform axial mass distribution, a larger rising solid flux, larger horizontal transportation velocity between the core and annulus regions, and a larger horizontal dispersion coefficient in the riser, as compared with the corresponding ones in the circular riser.

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Experimental Study and DEM Numerical Simulation of Dry/Wet Particle Flow Behaviors in a Spouted Bed

Cited by 23 publications

References 55 publications

Distinguishing Liquid Transport Patterns during the Fluidization of Wet Particles with Bed Expansion Behaviors

Distinguishing Liquid Transport Patterns during the Fluidization of Wet Particles with Bed Expansion Behaviors

Estimation of the Fluidization Behavior of Nonspherical Wet Particles with Liquid Transfer

Shape Effect of the Riser Cross Section on the Full-Loop Hydrodynamics of a Three-Dimensional Circulating Fluidized Bed

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