Particle scale study of heat transfer in packed and bubbling fluidized beds

Zhou, Zongyan; Yu, Aibing; Zulli, Paul

doi:10.1002/aic.11823

Cited by 274 publications

(161 citation statements)

References 46 publications

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“…An extended CFD-DEM approach by taking into account a comprehensive model of heat transfer mechanisms has been developed to study the heat transfer in packed and fluidized beds [11]. To reduce the computational cost that is inherent in the proposed model, a new computational method is developed by introducing a correction coefficient as the function of Young's modulus used in DEM [12].…”

Section: Model Descriptionmentioning

confidence: 99%

Discrete particle simulation of heat transfer in pressurized fluidized bed with immersed cylinders

Wahyudi

2013

AIP Conference Proceedings

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Abstract. The combined computational fluid dynamics and discrete element method (CFD-DEM) has been extended and used in recent years to study heat transfer between bed and an immersed cylinder in fluidized beds at the particle scale. The previous models usually assume the gas flow to be two-dimensional. This does not fully represent the reality in which both the gas motions and particle-gas interactions naturally have more than six degrees of freedom. Here, a full 3DCFD-DEM model is developed to study the heat transfer in 3D gas-fluidized beds with immersed cylinders. For the purpose of the model validation, the simulations are conducted first for a single cylinder under different superficial gas velocities. It is shown that the predicted heat transfer coefficients between the cylinder and bed as a function of superficial gas velocity qualitatively agree with the measurements reported in the literature. The v-shaped curve is also reproduced. Then the simulations are conducted for a fluidized bed with cylinder banks (inline and staggered configurations) at a moderate superficial gas velocity. It is also shown that there is no significant difference in the averaged heat transfer coefficient between inline and staggered arrangements at a moderate superficial gas velocity. This work demonstrates that the developed 3D CFD-DEM approach could be a useful tool to study the coupled flow phenomena and heat transfer in such complex systems.

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Section: Model Descriptionmentioning

confidence: 99%

Discrete particle simulation of heat transfer in pressurized fluidized bed with immersed cylinders

Wahyudi

2013

AIP Conference Proceedings

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“…Equations to calculate the interaction forces between particles and between particle and fluid can be found in Table 1, which has been used in our previous work. 23,24,[27][28][29][37][38][39] …”

Section: Model Descriptionsmentioning

confidence: 99%

Numerical Investigation of the Transient Multiphase Flow in an Ironmaking Blast Furnace

Zhou

Zhu

et al. 2010

ISIJ Int.

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Discrete particle simulation (DPS) has been applied to multiphase flow modelling in an ironmaking blast furnace (BF), including burden distribution at the top, gas-solid flow in the BF shaft and raceway, and liquid-solid flow in the hearth. In this work, the approach is further extended to take into account the transient features of gas and particle flow coupled with liquid tapping operation. In the simulation, two types of particles of coke and ore with different physical properties are considered, together with different shapes of the cohesive zone and the shrinkage of size of ore particles in the cohesive zone to present ore reduction. The simulated results show that the flow of both solid and gas phases varies spatially and temporally, particularly in the cohesive zone. Gas flow is strongly affected by the layered structure of ore and coke particles in the cohesive zone. A coke-free zone can form in the hearth, and the boundary profile between the coke-free zone and the coke bed depends on the amount of liquid accumulated in the hearth, gas and solid flow rates in the raceway, and coke consumption in different regions at the interface of liquid and the coke bed. The results show that the complicated transient multiphase-flow in a BF can be captured by the present approach which may be extended to account for heat transfer and chemical reaction in the future.KEY WORDS: multiphase flow; discrete particle simulation; computational fluid dynamics; blast furnace; cohesive zone. 515

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“…Zhou et al [5] extended the combined CFD and DEM approach [7,8] for multiphase flow to study heat transfer in gas fluidizationat a particle scale. The proposed approach includes three heat transfer modes: convection, conduction, and radiation.The heating process of a fluidized bedwith group B powders can be predicted as shown in Fig.…”

Section: Heat Transfr Of Group B Powders Figurementioning

confidence: 99%

“…In this work, some recent studiesby the authors on the heat transfer indifferent fluidization systems are briefly reviewed [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Computational study of heat transfer in gas fluidization

Hou

Zhou

2013

AIP Conference Proceedings

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Particle scale study of heat transfer in packed and bubbling fluidized beds

Cited by 274 publications

References 46 publications

Discrete particle simulation of heat transfer in pressurized fluidized bed with immersed cylinders

Discrete particle simulation of heat transfer in pressurized fluidized bed with immersed cylinders

Numerical Investigation of the Transient Multiphase Flow in an Ironmaking Blast Furnace

Computational study of heat transfer in gas fluidization

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