DEM simulation of wet granular-fluid flows in spouted beds: Numerical studies and experimental verifications

Zhang, Huang; Li, Shuiqing

doi:10.1016/j.powtec.2017.05.009

Cited by 42 publications

(29 citation statements)

References 45 publications

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“…The cohesive force reduced the velocity of particles, their concentration in the fountain and their recirculation flux. Zhang and Li [96] proposed a more detailed approach, which took into account both capillary and viscous forces, and applied it to monodispersed particles in a spouted bed. They validated it by comparison with several features observed in experiments, such as the fact that the frequency, velocity and fountain height were higher for wet rather than for dry particles.…”

Section: Study Of the Fluidisation Behaviourmentioning

confidence: 99%

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: Study Of the Fluidisation Behaviourmentioning

confidence: 99%

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

et al. 2017

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“…[11][12][13] It is capable of directly tracing the motion of individual particles, 14 thus obtaining the particle scale microscopic properties of the fluidized bed. In particular, particle cohesion can be straightforwardly considered through directly computing the interparticle forces such as the van der Waals force, [15][16][17][18] liquid bridge force, [19][20][21][22][23] and electrostatic force. [24][25][26][27][28] Hence, CFD-DEM approach was widely used in previous studies [29][30][31][32][33][34][35][36] for the microscopic understanding of the fluidization of cohesive particles.…”

Section: Introductionmentioning

confidence: 99%

Linking discrete particle simulation to continuum properties of the gas fluidization of cohesive particles

Hou

2020

AIChE Journal

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Discrete particle simulation can explicitly consider interparticle forces and obtain microscopic properties of the fluidized cohesive particles, but it is computationally expensive. It is thus pivotal to link the microscopic discrete properties to the macroscopic continuum description of the system for large scale applications. This work studies the fluidization of cohesive particles through the coupled computational fluid dynamics and discrete element method (CFD‐DEM). First, discrete CFD‐DEM results show the increased particle cohesion leads to the severe particle agglomeration which affects the fluidization quality significantly. Then, continuum properties are attained by a weighted time‐volume averaging method, showing that tensile pressure becomes significant as particle cohesion increases. By incorporating Rumpf correlation into the solid pressure equation, the tensile pressure could be predicted consistently with the averaged CFD‐DEM results for different particle cohesion. Finally, those overall steady averaged properties of the bed are obtained for understanding the general macroscopic properties of the system.

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“…The objective of this study is to investigate gas-solid spouted beds using the MFiX-DEM framework and demonstrate its effectiveness in predicting the flow regimes in the bed for different values of the background velocity and the spouting velocity. The DEM version of MFiX has been previously validated for the simulation of spouted beds with wet granular-fluid flows (Zhang & Li, 2017). The pressure fluctuations in the bed are recorded for each different operating condition and converted into a frequency spectrum using a Fourier transform.…”

Section: The Flow Pattern In a Spouted Bed Can Be Broadly Classified mentioning

confidence: 99%