CFD-DEM modeling of a three-dimensional prismatic spouted bed

Pietsch, Swantje; Heinrich, Stefan; Karpinski, Katja; Müller, Michael; Schönherr, Michael; Jäger, Frank

doi:10.1016/j.powtec.2016.12.046

Cited by 43 publications

(18 citation statements)

References 25 publications

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“…More recently, Pietsch et al [129] reported that Koch and Hill's [156] and Beetstra's [157] drag laws, based on Lattice-Boltzmann simulations, were the most adequate to reproduce the motion of particles in their prismatic spouted bed. Zhang and Li [98] argued that the drag coefficient is a 2nd order tensor, which can be reduced to a homogeneous function.…”

Section: Drag Law Number Of Occurrences Referencesmentioning

confidence: 99%

“…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%

“…Figure 8 shows a scheme with the most applied devices: porous/non-porous draft tubes (a), porous/non-porous draft plates (b) or the recently proposed fountain confiners (c) specifically used to improve the stabilization of the process with fine particles. An analysis with Fast Fourier Transform (FFT) allowed Pietsch and co-workers [129] to observe that the spouting behaviour (initially instable) of a 3D prismatic spouted bed with two horizontal gas inlets could be enhanced by the addition of two draft plates. This is mostly promising for processes with liquid injections.…”

Section: Dem Applied To Auxiliary Devicesmentioning

confidence: 99%

“…They assessed how the angle affected the minimum spouting velocity, proposing a new correlation for its calculation. They also observed that an increase of the angle (i.e., making the device wider) enhanced the velocity of particles and solid flux in the central zone and proposed a An analysis with Fast Fourier Transform (FFT) allowed Pietsch and co-workers [129] to observe that the spouting behaviour (initially instable) of a 3D prismatic spouted bed with two horizontal gas inlets could be enhanced by the addition of two draft plates. This is mostly promising for processes with liquid injections.…”

Section: Dem Applied To Auxiliary Devicesmentioning

confidence: 99%

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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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Section: Drag Law Number Of Occurrences Referencesmentioning

confidence: 99%

Section: Drag Law Number Of Occurrences Referencesmentioning

confidence: 99%

Section: Dem Applied To Auxiliary Devicesmentioning

confidence: 99%

Section: Dem Applied To Auxiliary Devicesmentioning

confidence: 99%

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

et al. 2017

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“…Computational fluid dynamics coupled with the discrete element method (CFD-DEM) 1,2 is widely used in the simulation of gas-solids flows, such as bubbling fluidized bed, 3 spouting fluidized bed, 4 cyclone separators, 5 circulating fluidized bed (CFB), 6 heat transfer, 7 and chemical reactions. 8 In CFD-DEM, the gas phase is solved on a fixed computational mesh while Lagrange tracking of particles follows Newton's laws of motion.…”

Section: Introductionmentioning

confidence: 99%

Method to estimate uncertainty associated with parcel size in coarse discrete particle simulation

Benyahia

2018

AIChE Journal

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Coarse grained particle methods significantly reduce the computation cost of large‐scale fluidized bed simulation by lumping many real particles into a computation parcel. This research provides a method to estimate the errors associated with parcel size in large‐scale fluidized bed simulations. This uncertainty is first quantified in small scale domains by comparing results of discrete particle method with that employing coarse parcels of different sizes. Then, this uncertainty is correlated with parcel size and simulation domains consisting of a simple homogeneous cooling system and more complex bubbling and circulating fluidized beds. These correlations allow us to accurately estimate the uncertainty in large‐scale fluidized beds based solely on data obtained in smaller systems. The ability to estimate model‐related uncertainty in larger systems makes this method relevant for industrial applications. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2340–2350, 2018

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Influence of Longitudinal Vortex Generator Configuration on the Hydrodynamics in a Novel Spouted Bed

Huang

Zhang

et al. 2018

Chem Eng & Technol

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The gas-solid flow in a cylindrical spouted bed with a pair of spherical longitudinal vortex generators (LVGs) was numerically investigated by a two-fluid model with kinetic theory for granular flow. Simulations and analyses were conducted on five types of spouted beds: a conventional spouted bed without disturbance units as well as spouted beds with a pair of LVGs in which the radius of spheres installed on the LVGs had four different dimensions. Results of the computational fluid dynamics demonstrate that the fountain height decreases with larger radius, and the influence range of the longitudinal vortex increases with the greater radius, both for the gas phase and particle phase. The turbulent kinetic energy of the gas phase along the radial and axial directions in the spouted bed was also promoted significantly by the longitudinal vortex and increased with larger radius, which is due to the higher LVG volume.

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CFD-DEM modeling of a three-dimensional prismatic spouted bed

Cited by 43 publications

References 25 publications

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

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

Method to estimate uncertainty associated with parcel size in coarse discrete particle simulation

Influence of Longitudinal Vortex Generator Configuration on the Hydrodynamics in a Novel Spouted Bed

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