Methods for multiphase computational fluid dynamics

Wachem, Berend G. M. van; Almstedt, Alf-Erik

doi:10.1016/j.cej.2003.08.025

Cited by 261 publications

(132 citation statements)

References 55 publications

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“…Two fluid models make use of the general equations of conservation of mass and momen tum for the mass in the gas (g) and particle (p) phases. Table 1 lists these equations expressed in absolute coordinates and standard vector notation [22]. From the definition of volume fraction it is implicit that a g + a p = 1.…”

Section: Two Fluid Model Equationsmentioning

confidence: 99%

“…The description of gas fluidized beds as two interpenetrating continua is the essence of two fluid models [22,26]. One contin uum refers to the gas phase in the bed and the other to the particle phase (also known as particulate or solids phase).…”

Section: Two Fluid Model Equationsmentioning

confidence: 99%

“…This allows the description of all the resulting particle particle and particle wall collisions [21,22]. Tatemoto et al [23] and Xiang et al [24] used the Lagrangian Eulerian method to simulate the motion of Geldart group B particles in a vibrated two dimensional bed that was fluidized with air.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, a different computa tional strategy would be desirable to numerically simulate larger beds while achieving computing times similar to the ones required for the simulation of conventional FB. In this regard, simulation of small and medium scale conventional gas fluidized beds is com monly undertaken by means of two fluid computational fluid dynamic (CFD) models, also known as Eulerian Eulerian two fluid models, which are primarily based on the representation of the gas phase and the particulate phase as two interpenetrating con tinua [22,26]. Two fluid models provide information about the macroscopic hydrodynamics (i.e.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A novel methodology for simulating vibrated fluidized beds using two-fluid models

Acosta-Iborra

Hernández-Jiménez

Vega

et al. 2012

Chemical Engineering Journal

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Section: Two Fluid Model Equationsmentioning

confidence: 99%

Section: Two Fluid Model Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A novel methodology for simulating vibrated fluidized beds using two-fluid models

Acosta-Iborra

Hernández-Jiménez

Vega

et al. 2012

Chemical Engineering Journal

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“…The level of resolution in particle motion can be reduced by computing only the bulk velocity behaviour of particles and not their individual trajec tories. This is the essence of a third approach known as Eulerian Eulerian, or CFD, two fluid modelling of fluidized beds (Gidaspow, 1994;Van Wachem and Almstedt, 2003). In this approach the gas phase and the particle or solids phase are treated as two inter penetrating and continuum media in an Eulerian framework using the conservation equation of fluids.…”

Section: Introductionmentioning

confidence: 99%

Comparison between two-fluid model simulations and particle image analysis & velocimetry (PIV) results for a two-dimensional gas–solid fluidized bed

Hernández-Jiménez

Sánchez-Delgado

Gómez-García

et al. 2011

Chemical Engineering Science

109

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a b s t r a c tThis work compares simulation and experimental results of the hydrodynamics of a two dimensional, bubbling air fluidized bed. The simulation in this study has been conducted using an Eulerian Eulerian two fluid approach based on two different and well known closure models for the gas particle interaction: the drag models due to Gidaspow and Syamlal & O'Brien. The experimental results have been obtained by means of Digital Image Analysis (DIA) and Particle Image Velocimetry (PIV) techniques applied on a real bubbling fluidized bed of 0.005 m thickness to ensure its two dimensional behaviour. Several results have been obtained in this work from both simulation and experiments and mutually compared. Previous studies in literature devoted to the comparison between two fluid models and experiments are usually focused on bubble behaviour (i.e. bubble velocity and diameter) and dense phase distribution. However, the present work examines and compares not only the bubble hydrodynamics and dense phase probability within the bed, but also the time averaged vertical and horizontal component of the dense phase velocity, the air throughflow and the instantaneous interaction between bubbles and dense phase. Besides, quantitative comparison of the time averaged dense phase probability as well as the velocity profiles at various distances from the distributor has been undertaken in this study by means of the definition of a discrepancy factor, which accounts for the quadratic difference between simulation and experiments The resulting comparison shows and acceptable resemblance between simulation and experiments for dense phase probability, and good agreement for bubble diameter and velocity in two dimensional beds, which is in harmony with other previous studies. However, regarding the time averaged velocity of the dense phase, the present study clearly reveals that simulation and experiments only agree qualitatively in the two dimensional bed tested, the vertical component of the simulated dense phase velocity being nearly an order of magnitude larger than the one obtained from the PIV experiments. This discrepancy increases with the height above the distributor of the two dimensional bed, and it is even larger for the horizontal component of the time averaged dense phase velocity. In other words, the results presented in this work indicate that the fine agreement commonly encountered between simulated and real beds on bubble hydrodynamics is not a sufficient condition to ensure that the dense phase velocity obtained with two fluid models is similar to that from experimental measurements on two dimensional beds.

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CFD‐DEM Formulation and Coupling

2016

Coupled CFD‐DEM Modeling

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Methods for multiphase computational fluid dynamics

Cited by 261 publications

References 55 publications

A novel methodology for simulating vibrated fluidized beds using two-fluid models

A novel methodology for simulating vibrated fluidized beds using two-fluid models

Comparison between two-fluid model simulations and particle image analysis & velocimetry (PIV) results for a two-dimensional gas–solid fluidized bed

CFD‐DEM Formulation and Coupling

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