Validation of CFD-DEM simulation of a liquid–solid fluidized bed by dynamic analysis of time series

Picabea, Julia; Maestri, Mauricio; Salierno, Gabriel; Blasio, Cataldo De; Cassanello, Miryan; Cardona, M. A.; Hojman, D.; Somacal, H.

doi:10.1016/j.partic.2021.11.003

Cited by 6 publications

(2 citation statements)

References 35 publications

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“…In the case of U o = 0 1 m/s (0 66u t ), the particles do not leave the bottom (see Figure 8) because the fluid's velocity is lower than the terminal velocity (u t = 0 030 m/s). This phenomenon was reported by Picabea et al [42], who found negligible fluidization for velocities below 0.021 m/s in a liquid-solid fluidized bed (LSFB) system with calcium alginate spheres. However, for velocities higher than terminal velocity (2 79u t , 4 11u t , and 5 42u t ), considerable fluidization is achieved due to drag, as shown in Figures 9-11, respectively.…”

Section: Particle'ssupporting

confidence: 69%

Theoretical Hydrodynamic Modeling of the Fluidized Bed Photoreactor (FBP) Using Computational Fluid Dynamics (CFD): Fluidization Conditions for TiO2-CuO Immobilized on Beach Sand Granules

Solano,

Mueses,

Herrera

2024

Modelling and Simulation in Engineering

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The flow regime is essential in the photoreactor’s performance in pollutant degradation in the aqueous medium, especially in fluidized systems. Therefore, this study is focused on determining the fluidization conditions of a granular catalyst based on TiO2-CuO nanoparticles (1 wt.% CuO) immobilized on beach sand granules using an FBP photoreactor. COMSOL Multiphysics 6.0 was employed for inlet velocities between 0.1 m/s and 1.0 m/s, mainly from the Reynolds averaged Navier–Stokes (RANS) turbulence model and the Stokes drag law. The results indicated that the average velocities in the annular section are much higher (4.11ut and 5.42ut) than the required particle terminal velocity. Moreover, the pressure contour lines revealed that these flow velocities do not represent excessive pressures in the concentric cylinders, with maximum gauge pressures of 740.52 Pa and 1310 Pa for inlet velocities Uo=0.75 and 1.0 m/s, respectively. Finally, it was determined that the Reynolds number adjusted (Repf) values lower than or equal to 1.37×10−3 allow high fluidization after 2 seconds. This information makes it possible to adapt and assemble the FBP equipment for future photocatalytic evaluation.

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Section: Particle'ssupporting

confidence: 69%

Theoretical Hydrodynamic Modeling of the Fluidized Bed Photoreactor (FBP) Using Computational Fluid Dynamics (CFD): Fluidization Conditions for TiO2-CuO Immobilized on Beach Sand Granules

Solano,

Mueses,

Herrera

2024

Modelling and Simulation in Engineering

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“…In recent years, the fluidized bed has been widely used in wastewater treatment, petrochemical industry, biochemistry, and other fields because of its good mass and heat transfer properties [1][2][3][4]. In order to design and optimize the fluidized bed, it is important to accurately measure the distribution and flow characteristics of each phase [5][6][7]. In the liquid-solid fluidized bed with uneven fluidization, the shear stress near the riser wall reduces the velocity of the liquid and solid phase, * Authors to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Removal of the effect of the high solids holdup ring in the fluidized bed on electromagnetic tomography

Wang

Luan

Liang

et al. 2023

Meas. Sci. Technol.

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Electromagnetic tomography (EMT) system based on tunneling magneto resistance (TMR) sensor, as a non-invasive multiphase flow measurement technique, can effectively detect the solid-phase distribution in the gas-liquid-solid three-phase fluidized bed with magnetic catalysts by reconstructing the permeability distribution image. The radial distribution of solid particles in the gas-liquid-solid three-phase fluidized bed with uneven fluidization is non-uniform, in which a high solids holdup ring exists near the wall of the riser. When the TMR-EMT system is used directly for image reconstruction, the high solids holdup ring will greatly reduce the image quality, further leading to the inability to detect phase information in the riser. To improve the reconstructed image by the TMR-EMT system, a removal method for the high solids holdup ring is proposed. The method firstly estimates the equivalent thickness of the high solids holdup ring based on the boundary measurement data. Then the influence of the high solids holdup ring on the boundary measurement data is subtracted. By the removal method, the internal phase distribution information is prominent. The simulation and experimental results demonstrate that the proposed method can realize the permeability distribution detection by the TMR-EMT system in the presence of the high solids holdup ring.

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In-depth validation of unresolved CFD-DEM simulations of liquid fluidized beds

et al. 2023

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Validation of CFD-DEM simulation of a liquid–solid fluidized bed by dynamic analysis of time series

Cited by 6 publications

References 35 publications

Theoretical Hydrodynamic Modeling of the Fluidized Bed Photoreactor (FBP) Using Computational Fluid Dynamics (CFD): Fluidization Conditions for TiO2-CuO Immobilized on Beach Sand Granules

Theoretical Hydrodynamic Modeling of the Fluidized Bed Photoreactor (FBP) Using Computational Fluid Dynamics (CFD): Fluidization Conditions for TiO2-CuO Immobilized on Beach Sand Granules

Removal of the effect of the high solids holdup ring in the fluidized bed on electromagnetic tomography

In-depth validation of unresolved CFD-DEM simulations of liquid fluidized beds

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