Simulations of flow behavior of gas and particles in spouted bed with a porous draft tube

Wang, Shuyan; Liu, Yongjian; Liu, Yikun; Wei, Lixin; Dong, Qun; Wang, Chunsheng

doi:10.1016/j.powtec.2010.01.012

Cited by 44 publications

(17 citation statements)

References 43 publications

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“…With no gas phase to hold them, the particles then fall downwards into the annulus region. Based on the flow structure, spouted beds are great candidates and well-suited to handle heavy, coarse, sticky, and/or irregularly shaped solids through cyclic flow patterns that are encountered in granulation, coating, gasification, and drying processes [9,10]. It is clear that such a flow pattern leads to complex hydrodynamics, recirculation flow, and gas-particle interactions.…”

Section: Introductionmentioning

confidence: 99%

An advanced evaluation of spouted beds scale-up for coating TRISO nuclear fuel particles using Radioactive Particle Tracking (RPT)

Ali

Al-Juwaya

Al‐Dahhan

2017

Experimental Thermal and Fluid Science

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A set of dimensionless groups has been proposed in the literature by He et al. [He Y. L., Lim C. J., Grace J. R., Scale-up studies of spouted beds, Chemical Engineering Science, 52 (2), 329-339, 1997] to scale-up gas-solid spouted beds while maintaining their hydrodynamics similarity. The literature reported studies do not provide conclusive assessments about this methodology. Therefore, in this work, we have applied an advanced non-invasive radioactive particle tracking (RPT) technique for the first time to evaluate such scale-up methodology by measuring the local solids velocity, normal and shear stresses and the turbulent kinetic energy. The axial and azimuthal averaged radial profiles of solids velocity, normal stresses, shear stresses, and turbulent kinetic energy illustrate that the similarity of the hydrodynamics has not been attained when the proposed set of dimensionless groups has been matched using two sizes of spouted beds of 0.076 m and 0.152 m and sets of operating conditions. The conclusion is consistent with the recent reported findings by measuring cross sectional distribution and radial profiles of solids and gas holdups along the bed height using gamma-ray computed tomography and by the limited point measurements of solids velocity and holdup using optical fiber probe. It is clear that local measurements of hydrodynamic parameters are essential for detailed assessment of scale-up methodologies. The presented results of our work in terms of the components profiles of the particles radial velocities and turbulent parameters are also valuable for benchmarking computational fluid dynamics codes and models.

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Section: Introductionmentioning

confidence: 99%

An advanced evaluation of spouted beds scale-up for coating TRISO nuclear fuel particles using Radioactive Particle Tracking (RPT)

Ali

Al-Juwaya

Al‐Dahhan

2017

Experimental Thermal and Fluid Science

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“…The air velocity, temperature and humidity vary along the spouted bed. According to the previous studies mentioned in the survey section [43,44,46,47]. It is assumed that the changes in the amounts of these parameters are negligible in the "x" and radial direction "r".…”

Section: Governing Equationsmentioning

confidence: 99%

“…Wang Shuyan et al [44] Simulated the gas and particle's behavior in a porous draft tube spouted bed dryer with Fluent 6.5 software in 2010; and validated their results by the Ishikura et al [45] empirical data. DEM simulation on particle mixing in dry and wet particles spouted bed was reported in reference number [46].…”

Section: Introductionmentioning

confidence: 96%

Transport phenomena study in a solar spouted bed dryer within a draft tube

Esmailie

Ghadamian

Aminy

2017

Env Prog and Sustain Energy

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This research investigated a high drying rate solar dryer with low-intensity energy consumption. In a brief issue, the solar spouted bed dryer was designed, fabricated and tested through this study. To cover this purpose, a 1D dynamic model was developed for this dryer's bed section. The mentioned accurate model is able to predict this type of solar dryer behavior which includes mass, momentum and energy transfer phenomena. The mentioned model solves the governing equations-mass, momentum, and energy balance equations-simultaneously using MATLAB software. By this system test pilot modeling and experiments, Design and manufacture of a high drying rate solar dryer with low energy intensity are achieved. Comparison between the model and experimental results shows that the maximum error percentage related to output profiles were approximately less than 3.6% that consider an appropriate band of errors. Based on experiments, the system is able to eliminate 85,500 mg water from 150 g corn grains during 90 min test interval. The considerable achievement contributed to the energy consumption intensity is equal to 93.3 kJ/g of corn, which can be a valuable energy heat rate.

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“…On the other hand, plenty of the numerical works are conducted in the 2D geometry. As has been described by Shuyan et al, the 3D simulations are necessary for correctly reproducing the experimental flow behaviour of particles in the spouted bed. Also, detailed flow behaviours of gas–solid phases can only be fully represented with a 3D modelling of the practical apparatus.…”

Section: Introductionmentioning

confidence: 99%

CFD‐DEM simulation of the spout–annulus interaction in a 3D spouted bed with a conical base

et al. 2013

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Numerical simulation of the gas–solid flow in a three‐dimensionally spouted bed with a conical base is conducted on the base of the CFD–DEM coupling approach. The gas phase is tracked at the computational grid level, while the solid motion is resolved at the particle scale level. The comparison is taken between the calculated results and the experimental data in literature. Hydrodynamics and spout–annulus interaction in the bed are investigated. The results demonstrate that the gas flow in the cylindrical region of the bed shows self‐similarity property. Solid vertical velocity in the central region increases initially and then decreases with bed elevation. The vertical solid transporting intensity is dramatically larger than the lateral one. Furthermore, the spout diameter exhibits a diverging tendency along the axial direction. Spout–annulus interaction intensity can be quantitatively described with solid flux exchanging from the spout boundary. Moreover, the interaction intensity through the spout–annulus interface increases initially, and then diminishes along the axial direction. Besides, the spout diameter and the spout–annulus interaction intensity are enlarged by increasing the spouting velocity.

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Simulations of flow behavior of gas and particles in spouted bed with a porous draft tube

Cited by 44 publications

References 43 publications

An advanced evaluation of spouted beds scale-up for coating TRISO nuclear fuel particles using Radioactive Particle Tracking (RPT)

An advanced evaluation of spouted beds scale-up for coating TRISO nuclear fuel particles using Radioactive Particle Tracking (RPT)

Transport phenomena study in a solar spouted bed dryer within a draft tube

CFD‐DEM simulation of the spout–annulus interaction in a 3D spouted bed with a conical base

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