An EMMS-based multi-fluid model (EFM) for heterogeneous gas–solid riser flows: Part I. Formulation of structure-dependent conservation equations

Hong, Kun; Wang, Wei; Zhou, Quan; Wang, Junwu; Li, Jinghai

doi:10.1016/j.ces.2012.03.022

Cited by 88 publications

(37 citation statements)

References 44 publications

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“…It is to be pointed out here that the particles with lower Archimedes number require major drag correction as compared to those with higher Archimedes number. This trend can also be observed in the work of Hong et al [18] where three different types of particle systems were simulated. Although the EMMS model used there was based on cluster description of heterogeneous structures.…”

Section: Cfd Simulation Of Turbulent Fluidized Bed With the Emms Dragsupporting

confidence: 52%

“…In the terminology of structure dependent multi-fluid model of Hong et al [18], the system can be decomposed into four components i.e. dilute-phase gas, dilute-phase solid, dense-phase gas and dense-phase solid.…”

Section: Mathematical Formulation Of Bubble-based Emms Mixture Modelmentioning

confidence: 99%

“…This methodology has been adopted widely by several investigators to model turbulent fluidized beds [10][11][12][13][14]. This approach requires either fine-grid resolution of the flows or modification of simulation parameters to incorporate sub-grid structures [15][16][17][18][19]. Although there has been some progress towards accurate resolution of the sub-grid scale structures but to date no unified approach exists.…”

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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Section: Cfd Simulation Of Turbulent Fluidized Bed With the Emms Dragsupporting

confidence: 52%

Section: Mathematical Formulation Of Bubble-based Emms Mixture Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bubble-based EMMS mixture model applied to turbulent fluidization

et al. 2015

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“…En este trabajo, se incluye como modelo de arrastre el EMMS (Energy Minimization Multi-Scale), el cual fue originalmente desarrollado por Yang y colaboradores (2003,2004) como parte del desarrollo de la teoría MultiEscala ; la cual ha sido utilizada por varios investigadores prediciendo adecuadamente el comportamiento del flujo gas-sólidos Hong et at., 2012;Wang et al, 2013;Zhou et al, 2014;Zhang et al, 2014;Liu et al, 2014).…”

Section: Introductionunclassified

Comportamiento Hidrodinámico y Térmico del Flujo Gas-Sólido en un Reactor de Tubo Vertical (Riser) del Proceso de Craqueo Catalítico (FCC) con dos Salidas Laterales Asimétricas

Paz-Paredes¹,

Saldaña²,

Moreno-Pacheco³

et al. 2016

Inf. tecnol.

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ResumenEn este trabajo se realiza la simulación numérica en 2D del comportamiento hidrodinámico y térmico del flujo gas-sólido en un reactor industrial (riser) con dos salidas colocadas asimétricamente, utilizando un modelo de la Dinámica de Fluidos Computacional. El sistema se considera adiabático y el modelo del sistema se resuelve por una aproximación Euleriana transitoria y la Teoría Cinética del Flujo Granular (KTGF, Kinetic Theory for Granular Flow). Como modelo de arrastre se utiliza la minimización multiescala de la energía (EMMS, Energy Minimization Multi-Scale). Las variables que se analizan son la distribución de densidad, la distribución de velocidades, la distribución del flujo másico, y los perfiles de temperatura de la fase sólida, a varias alturas del riser. Los resultados de este trabajo se comparan con los obtenidos anteriormente para una configuración de salidas simétricas. El modelo predice adecuadamente la presencia de tres zonas de concentración y velocidad de sólidos, así como la formación del patrón de flujo anular esperado en el riser. Palabras clave: simulación numérica; riser industrial; salidas asimétricas; aproximación Euleriana; modelo de arrastre EMMS Hydrodynamic and Thermal Behavior of Gas-Solid Flow in an Vertical Pipe Reactor (Riser) of the Fluid Catalytic Cracking Process (FCC) with Two Lateral Asymmetric Outlets AbstractIn this work 2D numerical simulations of gas-solid flow hydrodynamic and thermal behavior in an industrial riser is made using a Computational Fluid Dynamics model. The mixture goes out from the riser through two lateral upper asymmetric outlets. The system is considered to be adiabatic and the system is solved through a transient Eulerian approach and the Kinetic Theory for Granular Flow. The Energy Minimization MultiScale method (EMMS) is used as a drag model. Solid density distribution, velocity distribution, mass flow distribution and temperature profiles measured at several riser heights are analyzed. The results obtained in this work are compared with those previously obtained in a similar system but having two symmetric outlets. The model properly predicts the presence of three solid concentration and velocity zones, as well as the expected core-annular flow pattern in the riser.

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“…The EMMS drag model has now been applied widely because of its effectiveness at upgrading CFD. Extensive studies has been carried out at our institute by validating the model via simulations of the various aspects of the hydrodynamics of lab and pilot scale CFB units [38,39,[41][42][43][44][45][46][47][48][49][50][51][52][53][54][55], studying its relationship with classical continuum models and therefore formulating structure-dependent continuum models [56][57][58][59][60], doing various industrial projects [61][62][63][64][65][66][67][68] and extending the model to (i) consider the effect of heat and mass transfer as well as chemical reaction [69][70][71][72][73], (ii) consider the effect of particle size distribution [74,75], (iii) simulate the hydrodynamics of bubbling and turbulent fluidization [76][77][78][79] and (iv) the gas-liquid and gas-liquid-solid systems [40,[80][81]…”

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confidence: 99%

Approaching virtual process engineering with exploring mesoscience

2015

Chemical Engineering Journal

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An EMMS-based multi-fluid model (EFM) for heterogeneous gas–solid riser flows: Part I. Formulation of structure-dependent conservation equations

Cited by 88 publications

References 44 publications

Bubble-based EMMS mixture model applied to turbulent fluidization

Bubble-based EMMS mixture model applied to turbulent fluidization

Comportamiento Hidrodinámico y Térmico del Flujo Gas-Sólido en un Reactor de Tubo Vertical (Riser) del Proceso de Craqueo Catalítico (FCC) con dos Salidas Laterales Asimétricas

Approaching virtual process engineering with exploring mesoscience

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