Investigation of drag models in CFD modeling and comparison to experiments of liquid–solid fluidized systems

Visuri, Olli; Wierink, Gijsbert; Alopaeus, Ville

doi:10.1016/j.minpro.2011.12.006

Cited by 27 publications

(10 citation statements)

References 18 publications

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“…The effect of various drag models on gas-particle hydrodynamics in two different outlet risers were investigated within the gas velocity 6 m/sec, and the findings are shown in Figure 12 (abrupt shape) and Figure 13 (smooth shape), respectively. For the better (Wachem et al, 2001;Visuri et al, 2012). Other than this drag model, remaining three drag models (Wen-Yu, Ergun and Wen-Yu-Ergun) could be able to explain the show the cluster formation with heterogeneous meso-scale structure by the particles in both smooth and abrupt shape risers.…”

Section: Effect Of Drag Modelmentioning

confidence: 92%

“…In this way drag model has an important role in the modeling of gas-solid fluidized bed reactors because it gives the valuable information about the momentum exchange between the phases in any gas-solid fluidized bed reactors (Wachem et al, 2001;Li et al, 2009;Gao et al, 2009). For the determination of drag coefficient, different correlations are recommended in earlier research work, where, most of the drag models are based either a pressure drop in the entire two phase fluidized bed reactor or on the drag coefficient on a single particle (Visuri et al, 2012;Klimanek et al, 2015;Xie et al, 2018;Thapa et al, 2016). As explained above, the different traditional drag models have a significant effect on the CFB system hydrodynamics.…”

Section: Drag Modelsmentioning

confidence: 99%

“…On the other hand, for smooth shape riser (Figure 17), the Richardson-Davidson-Harrison model almost showed more solid volume fraction inside the whole riser. Fewer particle clusters would weaken the influenced by the different drag models, which could be the main reason why Wen-Yu and Wen-Yu-Ergun models showed better accuracy for the flow characteristics of gas-solid phase inside the both of the risers (Wachem et al, 2001;Visuri et al, 2012). However, the results of Wen-Yu, Ergun, Wen-Yu-Ergun and Richardson-Davidson-Harrison models justified that particles flow near to core region were higher than those near the wall of the smooth and abrupt shapes risers.…”

Section: Radial Solid Holdup With Different Drag Modelsmentioning

confidence: 99%

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Three-dimensional CFD simulation and experimental validation of particle segregation in CFB riser

Dwivedi

Pramanick

Karmakar³

et al. 2020

HFF

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Purpose The purpose of this paper is to perform the computational fluid dynamics (CFD) simulation with experimental validation to investigate the particle segregation effect in abrupt and smooth shapes circulating fluidized bed (CFB) risers. Design/methodology/approach The experimental investigations were carried out in lab-scale CFB systems and the CFD simulations were performed by using commercial software BARRACUDA. Special attention was paid to investigate the gas-particle flow behavior at the top of the riser with three different superficial velocities, namely, 4, 6 and 7.7 m/s. Here, a CFD-based noble simulation approach called multi-phase particle in cell (MP-PIC) was used to investigate the effect of traditional drag models (Wen-Yu, Ergun, Wen-Yu-Ergun and Richardson-Davidson-Harrison) on particle flow characteristics in CFB riser. Findings Findings from the experimentations revealed that the increase in gas velocity leads to decrease the mixing index inside the riser. Moreover, the solid holdup found more in abrupt riser than smooth riser at the constant gas velocity. Despite the more experimental investigations, the findings with CFD simulations revealed that the MP-PIC approach, which was combined with different drag models could be more effective for the practical (industrial) design of CFB riser. Well agreement was found between the simulation and experimental outputs. The simulation work was compared with experimental data, which shows the good agreement (<4%). Originality/value The experimental and simulation study performed in this research study constitutes an easy-to-use with different drag coefficient. The proposed MP-PIC model is more effective for large particles fluidized bed, which can be helpful for further research on industrial gas-particle fluidized bed reactors. This study is expected to give throughout the analysis of CFB hydrodynamics with further exploration of overall fluidization.

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Section: Effect Of Drag Modelmentioning

confidence: 92%

Section: Drag Modelsmentioning

confidence: 99%

Section: Radial Solid Holdup With Different Drag Modelsmentioning

confidence: 99%

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Three-dimensional CFD simulation and experimental validation of particle segregation in CFB riser

Dwivedi

Pramanick

Karmakar³

et al. 2020

HFF

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“…Different approaches for the slip velocity calculation exist [31]. The turbulent dispersion term, D md , quantifies the turbulent eddy diffusion, and its value is zero if no turbulence is present.…”

Section: Previous Workmentioning

confidence: 99%

Evaluating the Performance of the Mixture Model Coupled with High and Low Reynolds Turbulence Closures in the Numerical Description of Concentrated Solid-Liquid Flows of Settling Particles

Silva

Garcı́a

Faia

et al. 2015

The Journal of Computational Multiphase Flows

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In this manuscript, Computational Fluid Dynamics (CFD) studies applying the Mixture Model coupled with both a High Reynolds and a Low Reynolds k-ε turbulence closures, were used to describe experimental pressure gradients and particle concentration profiles from the literature, for concentrated solid-liquid flows of settling particles in a horizontal pipe above the critical deposition velocity. With this work a new Mixture Model formulation is presented, incorporating the Jones-Launder Low Reynolds k-ε turbulence closure, to overcome the excessive turbulence production observed in the numerical studies using the High Reynolds k-ε turbulence model. Additionally, this formulation provides a more accurate representation of the wall turbulence damping phenomena, observed in the experimental testing for the flow of higher particle concentrations suspensions and higher flow velocities. Knowledge on the conditions that cause turbulence attenuation on solid-liquid flows is still scarce in the literature and of considerable value for industrial applications.

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“…Therefore, applying a proper drag model in Eulerian-Eulerian modeling is of a great importance. Olli Visuri et al [12] focused on various drag models between the phases, the CFD results showed that the outcome from different drag models varied considerably and therefore the used model had to be chosen with care. Chanchal Loha et al [13] used CFD simulation to simulate the complex transient behavior of gas-solid flow.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation and experiment of residence time distribution in short-contact cyclone reactors

Zhang

Wang

You-hai

et al. 2015

Advanced Powder Technology

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Investigation of drag models in CFD modeling and comparison to experiments of liquid–solid fluidized systems

Cited by 27 publications

References 18 publications

Three-dimensional CFD simulation and experimental validation of particle segregation in CFB riser

Three-dimensional CFD simulation and experimental validation of particle segregation in CFB riser

Evaluating the Performance of the Mixture Model Coupled with High and Low Reynolds Turbulence Closures in the Numerical Description of Concentrated Solid-Liquid Flows of Settling Particles

CFD simulation and experiment of residence time distribution in short-contact cyclone reactors

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