Investigation of fluidization behavior of high density particle in spouted bed using CFD–DEM coupling method

Liu, Malin; Wen, Yuanyun; Liu, Rongzheng; Liu, Bing; Shao, Youlin

doi:10.1016/j.powtec.2015.04.042

Cited by 66 publications

(17 citation statements)

References 23 publications

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“…Particles and walls in the simulation were assumed to be glass beads and steel, respectively. Required simulation parameters for these materials were obtained from [39].…”

Section: Nauta Blender Simulation Resultsmentioning

confidence: 99%

Granular mixing in nauta blenders

et al. 2017

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Flow pattern of particles and their mixing performance in a Nauta blender were studied using the discrete element method. The model was validated by experimental data obtained in a convective conical screw blender and good agreement was obtained. Flow pattern of particles was studied through velocity profiles, granular temperature and streamlines of particles. Effects of sweeping rotation speed, primary rotation speed and impeller diameter on the mixing quality and mixing rate were studied. A vertical circulation pattern in the blender was observed due to the primary rotation of the impeller that produced a convective and layered flow. In this pattern, particles are lifted to the bed surface and then descend at the opposite side of the screw. On the other hand, the sweeping rotation of the impeller pushes the particles along the direction of sweeping which leads to a tangential flow of particles. Combination of primary and sweeping rotations of the impeller results in a three dimensional particle mixing. A semi-stagnant zone is also formed temporarily near the cone axis. It was found that increasing the primary rotation speed (from 5 to 10 rad/s) and impeller diameter

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“…Particles and walls in the simulation were assumed to be glass beads and steel, respectively. Required simulation parameters for these materials were obtained from [39].…”

Section: Nauta Blender Simulation Resultsmentioning

confidence: 99%

Granular mixing in nauta blenders

et al. 2017

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“…Similarly to the main drag law, additional drag models can simulate the effect of secondary physical phenomena; the most common ones are the Saffman force and the Magnus lift effect which are taken into account in some works [90,116,118,141,167], and neglected in others [101,106,112,120,129].…”

Section: Drag Law Number Of Occurrences Referencesmentioning

confidence: 99%

“…The spouting behaviour of high-density particles (like those employed in nuclear operations) was studied by Li and colleagues [101] employing a pseudo 2D geometry, assessing the dependency of many variables on particle density. Most notably, they observed that minimum spouting velocity and peak pressure drop were proportional to ρ p 0.67 and ρ p 1.2 (with ρ p being the density of particles) and that dense particles had a wider range of stable spouting state and a dual dominant frequency.…”

Section: Study Of the Fluidisation Behaviourmentioning

confidence: 99%

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

et al. 2017

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The development of robust mathematical models could provide the necessary tools for a more rapid, efficient, and reliable spouted bed technology development. Computer simulations can be very useful to aid this design and scale-up process: firstly, they can contribute to obtain a fundamental insight into their complex dynamic behavior by understanding the elementary physical principles such as drag, friction, dissipation etc.; secondly, the simulations can be used as a design tool where the ultimate goal is to have a numerical model with predictive capabilities for gas-particle flows at engineering scale. Clearly, one single simulation method will not be able to achieve this goal, but a hierarchy of methods modelling phenomena on different length and time scales can achieve this. The most fruitful approach will be when they are simultaneously followed, so that they can mutually benefit from each other. In this sense, this paper presents a review of the current state of the art of modelling on spouted and spout-fluid beds through an analysis of recent literature following a multiscale approach (molecular and particle, lab, plant and industrial scale). The main features of the different scales together with their current limits are discussed and specific topics are highlighted as paths that still need to be explored. In summary, the paper aims to define the theoretical setline and the basis of improvement that would lead to a robust multiscale model with solid links between micro and macroscopic phenomena. If done with the correct balance between accuracy and computational costs it will gear SB towards their reliable and successful implementation.

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“…The density of the kernel UO 2 (ρ p ~ 10.80 g/cm 3 ) is noticeably bigger than those of general particles found in chemical engineering study, for example glass beads (ρ p ~ 2.60 g/cm 3 ). Therfore, the impact of particle density on spouting behavior is essential and should be investigated systematically [15]. Since the layers compact together to form a non-homogenous mixture of multiple materials, the size and density of the particles during the coating process are not constant and vary with each layer deposition, as shown in Figure 2 [9].…”

Section: Introductionmentioning

confidence: 99%

“…They also pointed out that experimental investigations are needed to quantify specific influences of key parameters on local spouted bed hydrodynamics. Liu et al [15] used the CFD-DEM (Computational Fluid Dynamics-Discrete Element Model) coupling simulation method to examine the fluidization behavior of particles with different densities in the spouted bed. The simulation results revealed that the spouting behavior of the particles is incoherent and periodic when the spouting state is stable.…”

Section: Introductionmentioning

confidence: 99%

Investigation of cross-sectional gas-solid distributions in spouted beds using advanced non-invasive gamma-ray computed tomography (CT)

Al-Juwaya

Ali

Al‐Dahhan

2017

Experimental Thermal and Fluid Science

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The successful operation and safety of the Very-High-Temperature Nuclear Reactors (VHTR) extremely depend on the quality of the TRISO nuclear fuel coated particles. Hence, the fuel coating technology of TRISO particles, based on chemical vapour deposition (CVD) process, performed in gas-solid spouted beds, is of utmost importance. However, the deposition of the coating layers surrounding the kernel is a delicate process, and impacted by the hydrodynamics of spouted beds. Therefore, in this work, we have applied an advanced non-invasive gamma-ray computed tomography (CT) technique for the first time to investigate the hydrodynamics of spouted beds. In particular, we study the effect of particle density, particle size, bed size, and superficial gas velocity on the gas-solid cross-sectional distributions of spouted beds. The color distributions of the cross-sectional images clearly identified the three regions of spouted beds: the spout, the annulus, and the fountain regions. Interesting results and findings are presented, discussed and analyzed in the article. For example, the results demonstrated that the summation that operating spouted beds at stable spouting state would lead to achieving uniform coating layers of the particles in the TRISO fuel coating process is not adequate. Further, it has been found that increasing the superficial gas velocity much higher above the minimum spouting velocity increases the gas holdup in the annulus above the gas holdup value at the loss-packed bed state, contrary to common assumptions presented in the literature. This study represents an original experimental investigation required both for advancing the understanding of TRISO particles spouted bed and providing benchmark data to validate computational fluid dynamics (CFD).

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Investigation of fluidization behavior of high density particle in spouted bed using CFD–DEM coupling method

Cited by 66 publications

References 23 publications

Granular mixing in nauta blenders

Granular mixing in nauta blenders

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

Investigation of cross-sectional gas-solid distributions in spouted beds using advanced non-invasive gamma-ray computed tomography (CT)

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