Hydrodynamic study of a multiphase spouted column

Riera, Jaime; Zeppieri, Susana; Derjani-Bayeh, Sylvana

doi:10.1016/j.fuel.2014.08.007

Cited by 9 publications

(3 citation statements)

References 27 publications

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“…There is only one work employing ANSYS CFX, different from all the others as it regards the simulation of a SB containing water [217]. The Kinetic Theory of Granular Flow (KTGF) has been used in all simulations of spouted bed reactors employing an Eulerian approach, with no exceptions; details about its theoretical development can be found in the work of Gidaspow [233].…”

Section: Number Of Occurrences Referencesmentioning

confidence: 99%

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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: Number Of Occurrences Referencesmentioning

confidence: 99%

“…There is only one work employing ANSYS CFX, different from all the others as it regards the simulation of a SB containing water [217]. …”

Section: Number Of Occurrences Referencesmentioning

confidence: 99%

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

et al. 2017

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“…In the contact zone, bubbles are very small (smaller than 150 μm in diameter) and could maintain a spherical shape. Therefore, the Schiller and Naumann model, which was developed for spherical particles and has been validated in our previous study, was adopted in this investigation. The model can be written as …”

Section: Simulation Methodologymentioning

confidence: 99%

Modeling of Microbubble Flow and Coalescence Behavior in the Contact Zone of a Dissolved Air Flotation Tank Using a Computational Fluid Dynamics–Population Balance Model

Chen

Yang

Geng

et al. 2019

Ind. Eng. Chem. Res.

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Computational fluid dynamics coupled with a population balance model was implemented to resolve microbubble flow and coalescence behavior in the contact zone of a dissolved air flotation tank. Influences of two important interphase forces and coalescence models were examined. The results indicated that the lift force has negligible influence on gas holdup, while incorporating appropriate turbulent dispersion force model can substantially improve the predicted gas holdup and make it consistent with experimental data. The population balance model considering both the eddy-capture and velocity gradient mechanisms could accurately predict the bubble diameter and its size distribution. The relative difference between the simulated and the measured mean bubble diameter is lower than 10.2%. It was also found that bubble coalescence mainly happens below the nozzle inlet and around the nozzle inlet pipe, and the bubble coalescence was enhanced by the flow direction transition and nonuniform gas holdup distribution in these two regions, respectively.

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