Use of Fluid Dynamic Simulation to Improve the Design of Spouted Beds

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

doi:10.5772/27369

Cited by 1 publication

(2 citation statements)

References 20 publications

(24 reference statements)

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“…Bettega and his colleagues [234] performed simulations in a pseudo-cylindrical (half-column) spouted bed, highlighting that the specularity coefficient had a strong influence on the motion of the solid phase, but not on the static pressure, velocity of the particles in the bed and solid fraction in the spout. Fattahi et al [228] emphasised the relevance of the specularity coefficient too, identifying the most appropriate value for their case of study at 0.025 and encouraging the development of a correlation of this coefficient with different operational conditions.…”

Section: Optimisation Of Drag Laws and Coefficientsmentioning

confidence: 99%

“…Gidaspow [154] 17 [25,91,[204][205][206][208][209][210]213,218,220,222,226,228,229,234,235] Syamlal-O'Brien [158] 14 [89,90,92,114,203,207,214,215,224,225,[230][231][232]236 Turbulence was not extensively discussed in most works and when considered, the k-ε turbulence model [239] was mostly employed. As it can be seen in Table 9, almost half of the works did not include a turbulence model.…”

Section: Drag Law 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: Optimisation Of Drag Laws and Coefficientsmentioning

confidence: 99%