A drag model considering the particle size distribution via multi-subgrid for the simulation of downer

Lian, Wenhao; Pan, Xueer; Li, Zhengchen; Yang, Jingxuan; Hao, Xiaogang; Zhang, Hui; Fushimi, Chihiro; Tsutsumi, Atsushi; Huang, Wei; Guan, Guoqing

doi:10.1016/j.ces.2019.115363

Cited by 7 publications

(2 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Gidaspow drag model has also been proven to be an effective method for calculation of the interphase momentum transfer coefficient between the gas and solid phases in the downer reactor. ,, In this study, the Gidaspow drag model was employed with some adjustment by the constant factor to make the result consistent with the experimental data. Many researchers have widely used this method for studying the multiphase CFD simulation. − A summary of the governing equations, constitutive equations, and the interphase momentum transfer coefficient are given in Table S1.…”

Section: Simulation and Proceduresmentioning

confidence: 99%

Fast Pyrolysis Downer Reactor: Effect of Reactor Geometry on the Hydrodynamics

Soanuch

Korkerd

Pareek

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Downer reactors are the reactors of choice for fast chemical reactions, such as those associated with cracking of heavier feedstock in petroleum refineries. The objective of this study was to investigate the hydrodynamics of the downer reactor for biomass fast pyrolysis with specific emphasis on understanding the effect of the reactor geometry on the system hydrodynamics. Three-dimensional transient Eulerian–Eulerian simulations using the kinetic theory of granular flow were used to evaluate the effect of reactor tapering and cone position on the resulting hydrodynamics. It was found that optimal positioning of the cone could improve the mixing, while the suitable tapered downers could improve radial solid distribution while still resulting in a mean gas residence time within a range suitable for biomass fast pyrolysis.

show abstract

Section: Simulation and Proceduresmentioning

confidence: 99%

Fast Pyrolysis Downer Reactor: Effect of Reactor Geometry on the Hydrodynamics

Soanuch

Korkerd

Pareek

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Although the polydisperse drag model can be further extended to include more particle sizes, the solution scheme becomes more complex and the corresponding computation time increases by an order of magnitude. Lian et al 42 provided a new idea to build the drag model for the simulation of downer. The model divided the actual control volume into many subgrids with discrete particle sizes, and the drag force of each subgrid was added to get the total drag force.…”

Section: Introductionmentioning

confidence: 99%

Bubble-Based EMMS Drag Model for Particle Segregation Simulation with a Continuous Size Distribution

Wan

Liu

2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Particles in industrial fluidized beds are usually continuously distributed rather than monodisperse in size, and the separation of particles is a key factor in determining the performance of the fluidized reactor. In this paper, a bubble-based Energy Minimum Multi-Scale (EMMS) drag model was proposed to simulate polydisperse segregation in a gas–solid fluidized bed. Particle size distribution (PSD) was split into a sufficient class of characteristic particle sizes. Each size was treated as a solid phase, and the total drag force could be estimated by considering the influence of all solid phases and mesoscale structures. The EMMS drag model was then coupled with the Eulerian multi-fluid model (MFM) to simulate the segregation behavior of a polydisperse particle system. The effects of discrete particle size classes, different drag models, and gas velocities on the simulation results were also discussed under different operating conditions. The results showed that the present drag model was in better agreement with the experimental data in terms of axial solids concentration and mean particle size distribution than other models. In bubbling beds, the segregation patterns of polydisperse particles can be well predicted by this method.

show abstract

Hydrodynamic simulations of non-spherical particle dispersions in downer reactor with second-order moment turbulence model

Liu

Jiang

et al. 2021

Chemical Engineering and Processing - Process Intensification

View full text Add to dashboard Cite

A drag model considering the particle size distribution via multi-subgrid for the simulation of downer

Cited by 7 publications

References 40 publications

Fast Pyrolysis Downer Reactor: Effect of Reactor Geometry on the Hydrodynamics

Fast Pyrolysis Downer Reactor: Effect of Reactor Geometry on the Hydrodynamics

Bubble-Based EMMS Drag Model for Particle Segregation Simulation with a Continuous Size Distribution

Hydrodynamic simulations of non-spherical particle dispersions in downer reactor with second-order moment turbulence model

Contact Info

Product

Resources

About