Investigation on solid dispersion in a CFB dense region with Bluetooth tracking method and MP-PIC simulation

Luo, Guanwen; Cheng, Leming; Kang, Qixun; Zhang, Qingyu; Li, Kun; Guo, Qiang; Li, Weicheng

doi:10.1016/j.powtec.2023.118892

Powder Technology

2023

DOI: 10.1016/j.powtec.2023.118892

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Investigation on solid dispersion in a CFB dense region with Bluetooth tracking method and MP-PIC simulation

Guanwen Luo,

Leming Cheng,

Qixun Kang

et al.

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2024

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Cited by 3 publications

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Effective lateral dispersion of momentum, heat and mass in bubbling fluidized beds

Gustafsson,

Castilla,

Pallarès

et al. 2024

Front. Chem. Sci. Eng.

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The lateral dispersion of bed material in a bubbling fluidized bed is a key parameter in the prediction of the effective in-bed heat transfer and transport of heterogenous reactants, properties important for the successful design and scale-up of thermal and/or chemical processes. Computational fluid dynamics simulations offer means to investigate such beds in silico and derive effective parameters for reduced-order models. In this work, we use the Eulerian-Eulerian two-fluid model with the kinetic theory of granular flow to perform numerical simulations of solids mixing and heat transfer in bubbling fluidized beds. We extract the lateral solids dispersion coefficient using four different methods: by fitting the transient response of the bed to (1) an ideal heat or (2) mass transfer problem, (3) by extracting the time-averaged heat transfer behavior and (4) through a momentum transfer approach in an analogy with single-phase turbulence. The method (2) fitting against a mass transfer problem is found to produce robust results at a reasonable computational cost when assessed against experiments. Furthermore, the gas inlet boundary condition is shown to have a significant effect on the prediction, indicating a need to account for nozzle characteristics when simulating industrial cases.

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Effective lateral dispersion of momentum, heat and mass in bubbling fluidized beds

Gustafsson,

Castilla,

Pallarès

et al. 2024

Front. Chem. Sci. Eng.

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Numerical and Experimental Study on the Particle Erosion and Gas-Particle Hydrodynamics in a Codirectional Swirling Spouted Bed

Sun,

Che,

et al. 2024

Ind. Eng. Chem. Res.

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The experimental and simulative methods were used to study the hydrodynamic characteristics of gas−solid two-phase flow and particle erosion in a codirectional swirling spouted bed (CSSB). The four-zone flow of particles was found in the filling zone: separation zone, convergence zone, re-separation zone, and particle accumulation zone. The internal reinforced structure effectively strengthened the radial velocity of particles in the cylinder. In addition, the two serious erosion zones on the axial swirl vane were, respectively, in the convergence zone and particle accumulation zone, and the erosion heights were, respectively, roughly 0.045 m on the A-face and 0.076 m on the B-face. The erosion heights on the cylinder internal walls were basically 0.15 m with the increase of the inlet velocity. By comparing the axial swirling spouted bed, integrated multinozzle swirling spouted bed, and CSSB, it was found that CSSB had a better swirling effect and smaller intensity of particle erosion.

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Modeling of the Solid Stress Tensor in the MP-PIC Method: A Review of Methods and Applications

Henríquez-Vargas,

Donoso-García,

Lackey

et al. 2024

Mathematics

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In recent years, the fast growth of computational power has allowed the application of computational fluid dynamics (CFD) in a wide range of areas of interest, such as gas–solid unit operations. In this context, the multiphase particle-in-cell (MP-PIC) method appears as an option to represent fluid–particle and particle–particle interactions, avoiding the complexity of tracking each particle and the high computational cost derived from this. The MP-PIC method can represent the particles as a group with the same characteristics, allowing the simulation of gas–solid systems at different scales. To achieve this, the particle–particle interactions are simplified using the solid stress tensor to represent them; this does not require explicit expressions. This approach has a low computational cost, allowing the simulation of industrial cases using just workstations. This paper provides a review of the literature on the solid stress tensor and its commercial and non-commercial applications, including its historical and mathematical development in the description of particle–particle interactions. In addition, to consolidate the knowledge and advancing understanding in this crucial aspect of multiphase flow simulations, this review identifies the current challenges and opportunities for future research in multiphase systems based on the solid stress tensor. In addition, this review identifies the current challenges and opportunities for future research in multiphase systems based on the solid stress tensor.

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Investigation on solid dispersion in a CFB dense region with Bluetooth tracking method and MP-PIC simulation

Cited by 3 publications

References 36 publications

Effective lateral dispersion of momentum, heat and mass in bubbling fluidized beds

Effective lateral dispersion of momentum, heat and mass in bubbling fluidized beds

Numerical and Experimental Study on the Particle Erosion and Gas-Particle Hydrodynamics in a Codirectional Swirling Spouted Bed

Modeling of the Solid Stress Tensor in the MP-PIC Method: A Review of Methods and Applications

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