Scale‐up study of spouted beds using computational fluid dynamics

Béttega, Rodrigo; Corrêa, Ronaldo Guimarães; Freire, José Teixeira

doi:10.1002/cjce.20154

Cited by 38 publications

(34 citation statements)

References 46 publications

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“…A scale-up relationship for spouted beds was proposed by He et al [197]; Bettega and colleagues [235] verified its validity with a 2D model, confirming that when the scaling relationships were not satisfied, the hydrodynamics of the beds was severely hindered.…”

Section: Particle Mixingmentioning

confidence: 93%

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

et al. 2017

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The development of robust mathematical models could provide the necessary tools for a more rapid, efficient, and reliable spouted bed technology development. Computer simulations can be very useful to aid this design and scale-up process: firstly, they can contribute to obtain a fundamental insight into their complex dynamic behavior by understanding the elementary physical principles such as drag, friction, dissipation etc.; secondly, the simulations can be used as a design tool where the ultimate goal is to have a numerical model with predictive capabilities for gas-particle flows at engineering scale. Clearly, one single simulation method will not be able to achieve this goal, but a hierarchy of methods modelling phenomena on different length and time scales can achieve this. The most fruitful approach will be when they are simultaneously followed, so that they can mutually benefit from each other. In this sense, this paper presents a review of the current state of the art of modelling on spouted and spout-fluid beds through an analysis of recent literature following a multiscale approach (molecular and particle, lab, plant and industrial scale). The main features of the different scales together with their current limits are discussed and specific topics are highlighted as paths that still need to be explored. In summary, the paper aims to define the theoretical setline and the basis of improvement that would lead to a robust multiscale model with solid links between micro and macroscopic phenomena. If done with the correct balance between accuracy and computational costs it will gear SB towards their reliable and successful implementation.

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Section: Particle Mixingmentioning

confidence: 93%

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

et al. 2017

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“…According to their numerical study, the solid‐phase dynamic behaviour tends to disturb the flow inside the vessel; even the friction between solid phase and flat wall was negligible. In another work, Bettega et al investigated scaling relationships proposed by He et al for spouted bed systems based on similitude method using CFD simulation. They found that if all of the scale‐up relations are fulfilled, numerical simulation shows good results.…”

Section: Introductionmentioning

confidence: 99%

Cylindrical‐conical spouted bed dynamics: Laminar and turbulent flow predictions

2016

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This work numerically studies transient behaviour of particulate flows in a cylindrical‐conical spouted bed in terms of comparative analysis of different models’ predictions. Two approaches were used: a laminar flow model and a turbulent flow model. As a reference case, we consider experimental studies by He et al.,[14,15] where the profiles of vertical particle velocities and the void fraction in the spout and the fountain of a full‐column spout bed were measured. In this work we used the Euler‐Euler unsteady multiphase model with the Syamlal‐O'Brien, Gidaspow, and Wen‐Yu drag models available in commercial CFD software Fluent 14.0. Analysis of results obtained by the use of laminar and turbulent flow models revealed almost identical solid and gas phase velocities and phase fractions within the spouted bed region. We found that the turbulence plays a significant role only in the gas phase above the spouted bed and it does not have any influence on the solid phase. Comparing our simulation results in the form of time‐averaged vertical velocity of the solid phase against experimental data showed acceptable agreement in the spout and very good agreement in the fountain region. Numerical simulations with the Syamlal‐O'Brien drag model gave better agreement with experimental data than results obtained using the Gidaspow and Wen‐Yu drag models. To analyze the transient behaviour of the spouted bed, we use the volume‐averaged particle velocity and gas phase velocity. The analysis of their time histories showed that the start up time is 2–3 s. The developed unsteady regime is reached after 4–5 s. Additionally we studied numerically the influence of different discretization schemes for convective terms on the final results. We found that the use of 1st order upwind scheme gives a steady state solution for both models, laminar and turbulent. Finally, we investigated the influence of the restitution coefficient on the transient characteristics of a cylindrical‐conical spouted bed. A decrease in the value of the restitution coefficient leads to an increase in the period of oscillations of the volume‐averaged velocities of the gas and solid phases.

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“…The authors devised good predictions using this model. Many other researchers have adopted this kind of approach in the simulations of spouted beds, obtaining relevant information about their fluid dynamics …”

Section: Introductionmentioning

confidence: 99%

Study of hybrid drag models for predicting hydrodynamic behaviour in a spouted bed

et al. 2013

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A hybridisation study of drag models was performed in a conical–cylindrical spouted bed by means of CFD simulations using an Eulerian–Eulerian multiphase model. In order to evaluate the simulation results, time‐averaged velocity distributions of the particulate phase were compared with the experimental data obtained by means of an optical fibre probe. The hybrid drag model considering both the volume fraction and the granular temperature distribution in the drag force calculation predicted the experimental data of the particle velocity distribution better than the other simulations performed in this work using other hybrid drag models.

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Scale‐up study of spouted beds using computational fluid dynamics

Cited by 38 publications

References 46 publications

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

Cylindrical‐conical spouted bed dynamics: Laminar and turbulent flow predictions

Study of hybrid drag models for predicting hydrodynamic behaviour in a spouted bed

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