A CFD Comparative Study of Bubbling Fluidized Bed Behavior with Thermal Effects Using the Open-Source Platforms MFiX and OpenFOAM

Urrutia, Andrés Reyes; Venier, César M.; Mariani, Néstor Javier; Nigro, Norberto M.; Mazza, Germán

doi:10.3390/fluids7010001

Cited by 5 publications

(3 citation statements)

References 33 publications

(44 reference statements)

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“…However, it was found that the change in temperature on the surface of the intact Malan loess samples was not homogeneous, and a series of abnormal temperature points appeared. This phenomenon is consistent with the results of the simulation process of the particle-to-fluid heat transfer process studied by Urrutia et al [20]. This study aimed to investigate whether the abnormal temperature points detected by the surface thermal imager of Malan loess samples are caused by the heterogeneity of the particle skeleton or by the conductivity of different media in multiphase porous media.…”

Section: Discussionsupporting

confidence: 86%

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The Study on Solving Large Pore Heat Transfer Simulation in Malan Loess Based on Volume Averaging Method Combined with CT Scan Images

et al. 2023

Sustainability

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Malan loess is a wind-formed sediment in arid and semi-arid regions and is an important constituent of the Earth’s critical zone. Therefore, the study of the relationship between microstructure and heat transfer in Malan loess is of great significance for the in-depth understanding of the heat transfer mechanism and the accurate prediction of the heat transfer properties of intact loess. In order to quantitatively characterize the heat transfer processes in the two-phase medium of solid particles and gas pores in the intact loess, this study used modern computed tomography to CT scan the Malan loess in Huan County, Gansu Province, the western part of the Loess Plateau, China and used the specific yield of the intact Malan loess as the parameter basis for extracting the threshold segmentation of the large pores in the scanned images for the three-dimensional reconstruction of the connected large pores. An experimental space for heat conduction of intact Malan loess was constructed, and the surface temperature of Malan loess was measured on the surface of the space with a thermal imager. The simulation of the heat conduction process was carried out using the solution program in AVIZO (2019) software using the volume averaging method combined with CT scanning to reconstruct the 3D pores. The experiments of heat conduction in the intact Malan loess showed that for a given external temperature pressure, the temperature decreases along the heat flow direction as a whole. The temperature of the pores in the normal plane along the heat flow direction is higher than the temperature of the solid skeleton. Abnormal temperature points were formed at the junction of the surface and internal pores of Maran loess, and the temperature of the jointed macropores was about 1 °C higher at the surface of the sample than that of the surrounding solid skeleton. Simulation of heat conduction in Malan loess showed that the heat transfer process in Malan loess was preferentially conducted along the large pores and then the heat was transferred to the surrounding Malan loess particle skeleton. The simulation results of heat conduction in Malan loess were in high agreement with the experimental results of heat conduction in Malan loess, which verifies the reliability of the calculated model.

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Section: Discussionsupporting

confidence: 86%

“…Heat transfer in porous and particulate media is a widely studied topic mainly in the chemical engineering systems and materials [20]. In general, the effect of solid particles on the thermal conductivity of porous media is not dominant, especially for those nonmetallic porous materials [12,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

The Study on Solving Large Pore Heat Transfer Simulation in Malan Loess Based on Volume Averaging Method Combined with CT Scan Images

et al. 2023

Sustainability

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“…Reyes-Urrutia et al [24] compared OpenFOAM and MFIX for simulating bubbling fluidized bed systems under varying temperature and heat transfer conditions. Both codes accurately predicted minimum fluidization velocity and wall-to-bed heat transfer coefficients.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Different CFD Codes for Fluidized Beds

Kusriantoko,

Daun,

Einarsrud

2024

Dynamics

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Fluidized beds are pivotal in the process industry and chemical engineering, with Computational Fluid Dynamics (CFD) playing a crucial role in their design and optimization. Challenges in CFD modeling stem from the scarcity or inconsistency of experimental data for validation, along with the uncertainties introduced by numerous parameters and assumptions across different CFD codes. This study navigates these complexities by comparing simulation results from the open-source MFIX and OpenFOAM, and the commercial ANSYS FLUENT, against experimental data. Utilizing a Eulerian–Eulerian framework and the kinetic theory of granular flow (KTGF), the investigation focuses on solid-phase properties through the classical drag laws of Gidaspow and Syamlal–O’Brien across varied parameters. Findings indicate that ANSYS Fluent, MFiX, and OpenFOAM can achieve reasonable agreement with experimental benchmarks, each showcasing distinct strengths and weaknesses. The study also emphasizes that both the Syamlal–O’Brien and Gidaspow drag models exhibit reasonable agreement with experimental benchmarks across the examined CFD codes, suggesting a moderated sensitivity to the choice of drag model. Moreover, analyses were also carried out for 2D and 3D simulations, revealing that the dimensional approach impacts the predictive accuracy to a certain extent, with both models adapting well to the complexities of each simulation environment. The study highlights the significant influence of restitution coefficients on bed expansion due to their effect on particle–particle collisions, with a value of 0.9 deemed optimal for balancing simulation accuracy and computational efficiency. Conversely, the specularity coefficient, impacting particle–wall interactions, exhibits a more subtle effect on bed dynamics. This finding emphasizes the critical role of carefully choosing these coefficients to effectively simulate the nuanced behaviors of fluidized beds.

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Hydrodynamic characteristics of the flow around dispersed medium bodies

Redko,

Redko

2023

Heat Exchange of Tubular Surfaces in a Bubbling Fluidized Bed

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A CFD Comparative Study of Bubbling Fluidized Bed Behavior with Thermal Effects Using the Open-Source Platforms MFiX and OpenFOAM

Cited by 5 publications

References 33 publications

The Study on Solving Large Pore Heat Transfer Simulation in Malan Loess Based on Volume Averaging Method Combined with CT Scan Images

The Study on Solving Large Pore Heat Transfer Simulation in Malan Loess Based on Volume Averaging Method Combined with CT Scan Images

A Comparative Study of Different CFD Codes for Fluidized Beds

Hydrodynamic characteristics of the flow around dispersed medium bodies

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