Simulation of gas–solid two-phase flow by a multi-scale CFD approach—of the EMMS model to the sub-grid level

Wang, Wei; Li, Jinghai

doi:10.1016/j.ces.2006.08.017

Cited by 395 publications

(215 citation statements)

References 46 publications

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“…An increasing body of literature focusing on the subject is already available (e.g. [8][9][10][11]). However, the additional modelling included in this filtered approach introduces a substantial degree of uncertainty simply due to the complex nature of the subgrid clustering phenomena.…”

Section: Introductionmentioning

confidence: 99%

Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Effect of particle size

2015

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Section: Introductionmentioning

confidence: 99%

Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Effect of particle size

2015

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“…The solution scheme is essentially the same as in Wang and Li [25]. Once the system of equations has been solved for any voidage satisfying the stability criterion, the drag coefficient is then calculated as …”

Section:  mentioning

confidence: 99%

“…o Force balance for solid particle in the dense phase: Using equations for individual phases presented in Wang and Li [25] and following the approach for mixture modelling [31], we have the drag force for dense phase as…”

Section:  mentioning

confidence: 99%

“…Some authors [21][22][23] have used empirical correlations or equivalent cluster diameters to modify the homogeneous drag force. Others have considered heterogeneity by modifying the drag coefficient through the cluster-based EMMS (energy-minimization multi-scale) approach [24][25][26]. Recently there has been attempt to model the bubbling bed heterogeneity by following the EMMS principle [27].…”

Section: Introductionmentioning

confidence: 99%

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Bubble-based EMMS mixture model applied to turbulent fluidization

et al. 2015

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. AbstractTurbulent fluidization is now widely recognized as a distinct flow regime and is commonly utilized in industrial fluidized-bed reactors. However, relatively fewer attempts have been made to rigorously model these systems in comparison to bubbling and circulating fluidized beds. In this work, we have rewritten the original bubble based EMMS model in form of a mixture to apply it to turbulent fluidization. At microscale this mixture is composed of gas and particles whereas voids and gas-particle suspension make up this mixture at mesoscale level. Subsequently, all the system properties are then calculated in terms of mixture rather than individual phases. With the minimization of the objective function for the bubbling mixture, the set of equations is then solved numerically. The objective function, used to close the system of equations, is composed of the energy consumption rates required to suspend gas-particle suspension and the energy consumed due to interaction between suspension and voids. The model is then applied to simulate gas-solid turbulent fluidized beds. Simulation results are encouraging as the model is able to predict the dense bottom and dilute top zones along the height of the bed. Comparison of results with experimental data and homogeneous drag model has been made for validation purposes.

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“…Firstly, TFM-KTGF simulations are used to derive industrial scale filtered models (e.g. [4][5][6]) which are enjoying significant research attention at present. Secondly, as shown in the first part of this work [7], larger particle sizes have much less stringent grid size requirements than smaller particle sizes and industrial sized beds using large particles (~500 µm) can already be simulated with current computational capacities.…”

Section: Introductionmentioning

confidence: 99%

Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Detailed parametric study

2016

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Simulation of gas–solid two-phase flow by a multi-scale CFD approach—of the EMMS model to the sub-grid level

Cited by 395 publications

References 46 publications

Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Effect of particle size

Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Effect of particle size

Bubble-based EMMS mixture model applied to turbulent fluidization

Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Detailed parametric study

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