Upscaled DEM-CFD model for vibrated fluidized bed based on particle-scale similarities

Jiang, Zhaohua; Rai, Kenta; Tsuji, Tomohiro; Washino, Kimiaki; Tanaka, Toshitsugu; Oshitani, Jun

doi:10.1016/j.apt.2020.10.009

Cited by 29 publications

(4 citation statements)

References 33 publications

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“…Different testing methods for measuring solids distribution have been compared and improved by simulating the so-called "travelling fluidized bed" [96]. A coarse-graining application to segregation in vibrated fluidized beds can be found in Reference [97].…”

Section: Bubbling/spouted/liquid Fluidized Bedsmentioning

confidence: 99%

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

2021

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In the last decade, a few of the early attempts to bring CFD-DEM of fluidized beds beyond the limits of small, lab-scale units to larger scale systems have become popular. The simulation capabilities of the Discrete Element Method in multiphase flow and fluidized beds have largely benefitted by the improvements offered by coarse graining approaches. In fact, the number of real particles that can be simulated increases to the point that pilot-scale and some industrially relevant systems become approachable. Methodologically, coarse graining procedures have been introduced by various groups, resting on different physical backgrounds. The present review collects the most relevant contributions, critically proposing them within a unique, consistent framework for the derivations and nomenclature. Scaling for the contact forces, with the linear and Hertz-based approaches, for the hydrodynamic and cohesive forces is illustrated and discussed. The orders of magnitude computational savings are quantified as a function of the coarse graining degree. An overview of the recent applications in bubbling, spouted beds and circulating fluidized bed reactors is presented. Finally, new scaling, recent extensions and promising future directions are discussed in perspective. In addition to providing a compact compendium of the essential aspects, the review aims at stimulating further efforts in this promising field.

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Section: Bubbling/spouted/liquid Fluidized Bedsmentioning

confidence: 99%

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

2021

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“…The discrete element method (DEM) is a numerical method that can analyze contact, collision, and flow problems of particulate materials. Recently, DEM has been extended to encompass the analysis of interparticle contact heat conduction [21,22] and the investigation of fluid-structure interaction (FSI) [23][24][25][26]. However, there is still a lack of research on models for collision-induced heating and convective heat transfer to the ambient environment, both of which are essential for high-energy ball milling analysis [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling of Collisional Heat Generation and Convective Heat Transfer Problem for Single Spherical Body in Oscillating Boundaries

Son

2023

Mathematics

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The application of high-energy ball milling in the field of advanced materials processing, such as mechanochemical alloying and ammonia synthesis, has been gaining increasing attention beyond its traditional use in material crushing. It is important to recognize the role of thermodynamics in high-energy processes, including heat generation from collisions, as well as ongoing investigations into grinding ball behavior. This study aims to develop a mathematical model for the numerical analysis of a spherical ball in a shaker mill, taking into account its dynamics, contact mechanics, thermodynamics, and heat transfer. The complexity of the problem for mathematical modeling is reduced by limiting the motion to one-dimensional translation and representing the vibration of the vial wall in a shaker mill as rigid boundaries that move in a linear fashion. A nonlinear viscoelastic contact model is employed to construct a heat generation model. An equation of internal energy evolution is derived that incorporates a velocity-dependent heat convection model. In coupled field modeling, equations of motion for high-energy impact phenomena are derived from energy-based Hamiltonian mechanics rather than vector-based Newtonian mechanics. The numerical integration of the governing equations is performed at the system level to analyze the general heating characteristics during collisions and the effect of various operational parameters, such as the oscillation frequency and amplitude of the vial. The results of the numerical analysis provide essential performance metrics, including steady-state temperature and time constant for the characteristics of temperature evolution for a high-energy shaker milling process with a computation accuracy of 0.1%. The novelty of this modeling study is that it is the first to obtain such a high accuracy numerical solution for the temperature evolution associated with a shaker mill process.

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“…Researchers have successfully used the two-phase flow coupling method with the combination of the Discrete Element Method (DEM). Computational Fluid Dynamics (CFD) has be used to quantitatively study the particle-breaking process in a jet mill [10], the movement process of airflow transported seeds [11,12], the filling process of the pneumatic seed metering device [13][14][15][16][17], the design of seed feeding devices and horizontal seed supply pipe of the air-assisted centralized metering system [18,19], and it has also been used as a tool for optimizing the design of the machine structure [20][21][22][23][24][25][26][27][28]. Shi et al analyzed the main factors affecting the filling performance at each stage of the filling process at a microscopic scale.…”

Section: Introductionmentioning

confidence: 99%

Optimization and Experiment of a Disturbance-Assisted Seed Filling High-Speed Vacuum Seed-Metering Device Based on DEM-CFD

Liu²,

Zhao

et al. 2022

Agriculture

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In disturbance-assisted seed filling vacuum seed-metering devices, the suction hole causes difficulty in quickly and stably sucking seeds when used for high-speed seeding and the large working negative pressure demand is used. To address this difficulty, this study’s authors designed a seed disk hole with a variable cross-section structure, and the groove depth, which has the function of assisting seed filling, was optimized. Using the combined method of Fluent numerical analysis and an orthogonal experiment, the influence of the shape, inlet diameter, and length of the seed disk hole on the pressure difference of the seed disk hole was analyzed. The working process of the vacuum seed meter was simulated and analyzed by the Discrete Element Method and Computational Fluid Dynamics coupling method. It was found that with the increase of the diameter of the seed disk hole, the pressure difference decreased, and the length of the seed disk hole had little effect on the pressure difference. The best diameter of the seed disk hole was 5.4 mm, and the length was 5 mm. It was found that the pressurization effect of the arc-shaped seed disk hole is better. With the increase of groove depth, the leakage rate shows a trend of first decreasing and then increasing, which was determined to be 1.5 mm. The verification experiment proved that the working performance of the optimized seed metering device is better than that of the original one. The results show that when the working negative pressure was 4 kPa and the working speeds were 8~14 km·h−1, the qualified rate was not less than 95.0%, and the seed filling performance was relatively stable. The optimized vacuum seed metering device can be applied to high-speed seeders, while ensuring the requirements of high-speed sowing operations.

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Upscaled DEM-CFD model for vibrated fluidized bed based on particle-scale similarities

Cited by 29 publications

References 33 publications

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

Mathematical Modeling of Collisional Heat Generation and Convective Heat Transfer Problem for Single Spherical Body in Oscillating Boundaries

Optimization and Experiment of a Disturbance-Assisted Seed Filling High-Speed Vacuum Seed-Metering Device Based on DEM-CFD

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