Numerical analysis and experimental validation of hydrodynamics of a thin bubbling fluidized bed for various particle-size distributions using a three-dimensional dense discrete phase model

Hashemisohi, Abolhasan; Wang, Lijun; Shahbazi, Abolghasem; Amini, Hossein

doi:10.1016/j.partic.2019.04.001

Cited by 17 publications

(4 citation statements)

References 71 publications

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“…Therefore, it has gradually become the mainstream to investigate the gas-solid two-phase flow characteristics by means of numerical simulation. The research on the characteristics of gas-solid two-phase flow field is relatively mature, which mainly involves gas-solid mixing [19,25,[35][36][37][38], diffusion [36], aggregation [39][40], separation [20,41], backmixing [40,42], uniformity [43][44] and heat transfer [45][46][47]. However, the particles properties are more complex.…”

Section: Gas-solid Flow Characteristicsmentioning

confidence: 99%

Research Progress on Numerical Simulation of Two-phase Flow in the Gas-solid Fluidized Bed

et al. 2021

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It is difficult to accurately measure the parameters of solid particles in the experiment of the gas-solid fluidized bed. The numerical simulation plays an important role to accurately describe flow characteristics in the fluidized bed. Combined with the research work of the research group, this paper analyzes the application of numerical simulation of fluidized bed from the aspects of gas-solid coupling algorithm, drag model, flow characteristics, and reaction characteristics based on the previous studies. The specificity improvement of the gas-solid coupling algorithm and the regional application of the drag model is the trend of the recent development of numerical simulation. Previous studies mainly focus on the gas-solid two-phase flow field characteristics in the traditional fluidized bed, but few on the complex flow characteristics such as gas-solid reverse flow and the coupling with reaction characteristics. It is of great significance for designing a novel fluidized bed reactor to realize gas-solid continuous reaction to establish and improve the numerical simulation method of gas-solid non-catalytic reaction.

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Section: Gas-solid Flow Characteristicsmentioning

confidence: 99%

Research Progress on Numerical Simulation of Two-phase Flow in the Gas-solid Fluidized Bed

et al. 2021

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“…Sheldon and Finnie conducted experiments and analysis, demonstrating that certain size and flow velocity ranges of impact particles can cause plastic deformation and exhibition of wear characteristics typically observed in flexible materials [10]. Hashemisohi et al employed a dense discrete phase model coupled with granular fluid dynamic theory and experiments to investigate the bubble characteristics and separation of multi-component particle mixtures in a fluidized bed [11]. Jafari et al examined the erosion wear characteristics of four different wear-resistant steel plates and developed a device to evaluate erosion wear rates of various materials under different slurry concentrations [12].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Study on Sediment Wear of Fixed Guide Vanes of Hydraulic Turbines in Muddy River Based on Discrete Phase Model

et al. 2023

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The erosion of the fixed guide vane of a hydraulic turbine by sandy water is influenced not only by flow velocity and mud concentration but also by the direction and speed of the sandy water over the surface. This study aims to investigate the erosive effect of sediment-laden water on a specific type of hydraulic turbine’s fixed guide vane, validate the efficacy of the discrete phase model (DPM) in simulating wear on the fixed guide vane, and identify the critical areas of wear on its surface. To achieve these objectives, the wear model and DPM model are employed to conduct numerical simulations on the fixed guide vane. Additionally, samples of sand are collected from the power station site, and laboratory tests are conducted on the hydraulic turbine’s flow passage components using actual sediment concentration and sand-to-water ratio to determine the sediment wear conditions. The numerical simulation results of the guide vane’s surface wear rate are compared with the experimental data to verify the wear condition of the fixed guide vane under its rated working condition. These findings serve as a reference for the later-stage design of erosion-resistant solid guide vanes for hydraulic turbines.

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“…In addition to bubbling fluidized beds, many experiments were also carried out in CFB risers to analyze the effect of PSD on flow characteristics. − Numerical simulations can provide more detailed information that is difficult to obtain from experiments. Several simulations have been conducted to explore the impact of polydispersity on hydrodynamics in gas–solid systems. − In a thin bubbling bed, Hashemisohi et al studied the bubble dynamics and segregation of polydispersed particles by the hybrid Eulerian–Lagrangian method. Simulations showed that a lognormal mixture with small proportions of large particles had the most even distribution.…”

Section: Introductionmentioning

confidence: 99%

“…Several simulations have been conducted to explore the impact of polydispersity on hydrodynamics in gas− solid systems. 21−23 In a thin bubbling bed, Hashemisohi et al 24 studied the bubble dynamics and segregation of polydispersed particles by the hybrid Eulerian−Lagrangian method. Simulations showed that a lognormal mixture with small proportions of large particles had the most even distribution.…”

Section: Introductionmentioning

confidence: 99%

Bubble-Based EMMS Drag Model for Particle Segregation Simulation with a Continuous Size Distribution

Wan

Liu

2022

Ind. Eng. Chem. Res.

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Particles in industrial fluidized beds are usually continuously distributed rather than monodisperse in size, and the separation of particles is a key factor in determining the performance of the fluidized reactor. In this paper, a bubble-based Energy Minimum Multi-Scale (EMMS) drag model was proposed to simulate polydisperse segregation in a gas–solid fluidized bed. Particle size distribution (PSD) was split into a sufficient class of characteristic particle sizes. Each size was treated as a solid phase, and the total drag force could be estimated by considering the influence of all solid phases and mesoscale structures. The EMMS drag model was then coupled with the Eulerian multi-fluid model (MFM) to simulate the segregation behavior of a polydisperse particle system. The effects of discrete particle size classes, different drag models, and gas velocities on the simulation results were also discussed under different operating conditions. The results showed that the present drag model was in better agreement with the experimental data in terms of axial solids concentration and mean particle size distribution than other models. In bubbling beds, the segregation patterns of polydisperse particles can be well predicted by this method.

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Numerical analysis and experimental validation of hydrodynamics of a thin bubbling fluidized bed for various particle-size distributions using a three-dimensional dense discrete phase model

Cited by 17 publications

References 71 publications

Research Progress on Numerical Simulation of Two-phase Flow in the Gas-solid Fluidized Bed

Research Progress on Numerical Simulation of Two-phase Flow in the Gas-solid Fluidized Bed

Numerical Simulation and Experimental Study on Sediment Wear of Fixed Guide Vanes of Hydraulic Turbines in Muddy River Based on Discrete Phase Model

Bubble-Based EMMS Drag Model for Particle Segregation Simulation with a Continuous Size Distribution

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