Comparison of CFD-DEM and TFM simulations of single bubble injection in 3D gas-fluidized beds with MRI results

Xi, Kenan; Guo, Qiang; Boyce, Christopher M.

doi:10.1016/j.ces.2021.116738

Cited by 18 publications

(13 citation statements)

References 54 publications

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“…Even so, showing that MFM simulations can successfully capture the rising of granular bubble as a whole and in conditions without any gas bubbles is of great value, considering that MFM is a continuum modeling approach. For comparison, it should be noted that a number of prior works involving numerical modeling of gas bubbles in fluidized beds have demonstrated significant deviations in the prediction of the shape and rise velocity of gas bubbles when compared to experiments 41 …”

Section: Resultsmentioning

confidence: 99%

“…For comparison, it should be noted that a number of prior works involving numerical modeling of gas bubbles in fluidized beds have demonstrated significant deviations in the prediction of the shape and rise velocity of gas bubbles when compared to experiments. 41 With the Schaeffer model 16 turned off, Figure S2 shows that large gas bubbles appear and gas channels into these gas bubbles, but not the granular bubble. As a result, although the granular bubble can still rise to the top, it displays a tendency to percolate through the bed.…”

Section: Effect Of the Packing Limitmentioning

confidence: 99%

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Multifluid model simulations of gravitational instabilities in fluidized binary granular materials

et al. 2022

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Predicting granular flow using continuum approaches is fundamental to advance granular physics and industrial applications. Previous studies have demonstrated that continuum modeling can capture some hydrodynamic instability analogs in monodisperse granular materials. Recently, a family of gravitational instabilities was found between two types of grains, including a Rayleigh-Taylor analog, a granular bubble rising, a granular droplet splitting and particle segregation. The high packing fraction and bi-disperse nature of these flows allow for new challenges to continuum models.Herein, we applied multifluid modeling (MFM) that treats the gas phase and two separate granular phases as fully interpenetrating continua to simulate these instabilities and compared them with newly conducted experiments. Simulation results reproduced all of the four instabilities and demonstrated that frictional particle stress and solids-solids drag are needed to capture critical qualitative flow features. This study can serve as a basis for challenging future particle stress and solids-solids drag models.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of the Packing Limitmentioning

confidence: 99%

Multifluid model simulations of gravitational instabilities in fluidized binary granular materials

et al. 2022

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“…Similar bed pressure drops and gas volume fractions were observed using both approaches in the bubbling FB. A comparison of bubble rise velocity and bubble wake was performed using the CFD-DEM and TFM with classical KTGF in an air–particle FB ( d s = 3.0 mm and ρ s = 1040 kg/m 3 ) . The density ratio ρ s /ρ g was about 848.9.…”

Section: Introductionmentioning

confidence: 89%

Numerical Investigation of the Two-Fluid Model and Computational Fluid Dynamics–Discrete Element Method in Supercritical Methanol Fluidized Beds

Cai

Zhang

Wang

et al. 2022

Ind. Eng. Chem. Res.

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This work focuses on the comparison of simulated methanol fluid–particle fluidization behavior using the two-fluid model (TFM) and computational fluid dynamics–discrete element method (CFD-DEM) in subcritical methanol (SbM) and supercritical methanol (SCM) fluidized beds (FBs). The solid-phase constitutive correlations are modeled using the low density ratio-based kinetic theory of granular flow. The fluidization states of methanol fluid–particle mixtures using the TFM and CFD-DEM are compared with four thresholds reported in the literature. The outcome of the comparison shows that simulations using the TFM and CFD-DEM capture the coexistence of wave-like flow and churn-like flow along bed height in SbM FBs, and particle aggregates and fluid voids flow in SCM FBs. Agreement in methanol fluid pressure is observed, while discrepancy in volume fractions and velocities is found from the TFM and CFD-DEM in SbM and SCM FBs. Predicted methanol fluid fluctuating quantities of turbulent kinetic energy, dissipation rate, and granular temperatures show sensitivity to the two-equation turbulence model and collisional properties. The predicted expansion bed height and volume fractions agree well with experimental data in superficial carbon dioxide fluid and ambient water FBs.

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“…Two-fluid modeling (TFM) has been widely used in the literature, ,− simulating gas and particles as interpenetrating continua using computational fluid dynamics (CFD), utilizing constitutive relationships to model an effective stress of the particle phase and coupling gas and solid flow using a drag law. The governing equations and constitutive relationships used for TFM are shown below.…”

Section: Methodsmentioning

confidence: 99%

Contact-Based Method to Evaluate Mixing in Multicomponent Experiments and Simulations

Guo

Boyce

et al. 2021

Ind. Eng. Chem. Res.

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A contact-based method to evaluate mixing in a multicomponent system is proposed in this work. The proposed method is based on spatial contact frequency. One component contacting another component more frequently in space yields a higher mixing index. The preliminary applications of this method in a quasi-2D binary experiment and a 3D ternary simulation are presented. Detailed mixing information is presented. Comparisons with other methods are made, and the advantages of this method can be summarized by the following: (i) it captures all mixing behavior described in other methods listed in this work and (ii) it provides more specific information about mixing which all other methods miss, such as the mixing index of any specific component or components with respect to any other or all components. The advantages of the proposed method and the disadvantages of the existing methods are discussed.

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Comparison of CFD-DEM and TFM simulations of single bubble injection in 3D gas-fluidized beds with MRI results

Cited by 18 publications

References 54 publications

Multifluid model simulations of gravitational instabilities in fluidized binary granular materials

Multifluid model simulations of gravitational instabilities in fluidized binary granular materials

Numerical Investigation of the Two-Fluid Model and Computational Fluid Dynamics–Discrete Element Method in Supercritical Methanol Fluidized Beds

Contact-Based Method to Evaluate Mixing in Multicomponent Experiments and Simulations

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