DEM-LES of coal combustion in a bubbling fluidized bed. Part I: gas-particle turbulent flow structure

ZHOU, H; Flamant, Gilles; Gauthier, Daniel J.

doi:10.1016/s0009-2509(04)00293-3

Cited by 89 publications

(25 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2.3. Dynamic model of FBC boiler Zhou, Flamant, and Gauthier (2004) set up an elaborate model of FBC to describe the complex turbulent characteristics based on the 2-D Navier-Stokes equations. However the equations are expected to be solved by the numerical method of large eddy simulation (LES), whose computational complexity makes it inappropriate for a control simulation platform.…”

Section: Control Objectivesmentioning

confidence: 99%

Enhanced decentralized PI control for fluidized bed combustor via advanced disturbance observer

Sun

Lee

2015

Control Engineering Practice

View full text Add to dashboard Cite

Section: Control Objectivesmentioning

confidence: 99%

Enhanced decentralized PI control for fluidized bed combustor via advanced disturbance observer

Sun

Lee

2015

Control Engineering Practice

View full text Add to dashboard Cite

“…The physical process of particles' collision can be described by the "spring-damper" model, which was first applied in the CFB's simulation by Tsuji [15] and developed rapidly in the dense gas-solid flow simulation [16,17]. The "spring-damper" model is shown in Fig.…”

Section: Striking Forcementioning

confidence: 99%

Research of the gas-solid flow character based on the DEM method

Wang

Xiao

2011

J. Therm. Sci.

View full text Add to dashboard Cite

Numerical simulation of gas-solid flow behaviors in a rectangular fluidized bed is carried out three dimensionally by the discrete element method (DEM). Euler method and Lagrange method are employed to deal with the gas phase and solid phase respectively. The collided force among particles, striking force between particle and wall, drag force, gravity, Magnus lift force and Saffman lift force are considered when establishing the mathematic models. Soft-sphere model is used to describe the collision of particles. In addition, the Euler method is also used for modeling the solid phase to compare with the results of DEM. The flow patterns, particle mean velocities, particles' diffusion and pressure drop of the bed under typical operating conditions are obtained. The results show that the DEM method can describe the detailed information among particles, while the Euler-Euler method cannot capture the micro-scale character. No matter which method is used, the diffusion of particles increases with the increase of gas velocity. But the gathering and crushing of particles cannot be simulated, so the energy loss of particles' collision cannot be calculated and the diffusion by using the Euler-Euler method is larger. In addition, it is shown by DEM method, with strengthening of the carrying capacity, more and more particles can be schlepped upward and the dense suspension upflow pattern can be formed. However, the results given by the Euler-Euler method are not consistent with the real situation.

show abstract

“…The fourth term on the right-hand side of Eq. (4) stands for gas-particle interaction term [8] , and the fifth is the source term accounting for the particle wake effect proposed by present author [9] . In SGS kinetic energy equation of LES by all other studies, the particle wake effect has not been accounted for.…”

Section: Reynolds Numbermentioning

confidence: 99%

Comparison of gas particle flow prediction from large eddy simulation and Reynolds-averaging Navier-Stokes modeling

Zeng

Sun

Zhou

2010

J. Shanghai Jiaotong Univ. (Sci.)

View full text Add to dashboard Cite

In order to account for the effect of particle existence on gas-particle turbulence flow in large-eddy simulation (LES), a new gas-particle turbulent kinetic energy subgrid-scale (SGS) turbulence model is established, and the effect of particle wake is also considered in gas turbulent kinetic energy SGS turbulence model. Simulation of gas-particle turbulence flow in backward-facing step is carried out by LES using present model and by unified second-order moment (USM) model. The prediction statistical results including mean velocity and fluctuation velocity by LES using present model are in reasonable agreement with the experimental results. It is shown that present model is with higher calculating accuracy than USM model, which indicates that the turbulent kinetic energy SGS turbulence model is suitable.

show abstract

DEM-LES of coal combustion in a bubbling fluidized bed. Part I: gas-particle turbulent flow structure

Cited by 89 publications

References 0 publications

Enhanced decentralized PI control for fluidized bed combustor via advanced disturbance observer

Enhanced decentralized PI control for fluidized bed combustor via advanced disturbance observer

Research of the gas-solid flow character based on the DEM method

Comparison of gas particle flow prediction from large eddy simulation and Reynolds-averaging Navier-Stokes modeling

Contact Info

Product

Resources

About