Analysis of the incipient motion of spherical particles in an open channel bed, using a coupled computational fluid dynamics–discrete element method model

Bravo-Blanco, A.; Sánchez-Medina, Álvaro; Ayuga, Francisco

doi:10.1016/j.biosystemseng.2016.12.003

“…Bravo-Blanco et al [134] studied the incipient motion of single particles in an open channel. They evaluated this system based on the critical liquid velocity in which particle motion was initiated.…”

Section: Hydraulic Conveyancementioning

confidence: 99%

A Novel Approach For Analyzing Mixing Quality In Solid-Liquid Stirred Tanks Via Coupled Computational Fluid Dynamics - Discrete Element Method And Electrical Resistance Tomography

Tran¹

2021

Preprint

0

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The mixing quality of a solid-liquid stirred tank operating in the turbulent regime was investigated, numerically and to an extent experimentally. Simulations were performed by coupling Computational Fluid Dynamics (CFD) and the Discrete Element Method (DEM). The results were evaluated against experimental data obtained using Electrical Resistance Tomography (ERT). This facilitated a novel and more rigorous assessment of CFD-DEM coupling – i.e. based on the spatial distribution of particle concentrations. Furthermore, a new mixing index definition was developed to quantify suspension quality to work in tandem with existing dispersion mixing indexes. This provides a more complete interpretation of mixing quality. In this work, it was found that the model underestimated suspension and dispersion due to model limitations associated with mesh size and fluid-particle interaction models. Furthermore, the predicted mixing quality was sensitive to changes in the drag model, including other fluid-particle interaction forces in simulations, and variations in certain particle properties

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“…Bravo-Blanco et al [134] studied the incipient motion of single particles in an open channel. They evaluated this system based on the critical liquid velocity in which particle motion was initiated.…”

Section: Hydraulic Conveyancementioning

confidence: 99%

A Novel Approach For Analyzing Mixing Quality In Solid-Liquid Stirred Tanks Via Coupled Computational Fluid Dynamics - Discrete Element Method And Electrical Resistance Tomography

Tran¹

2021

Preprint

0

View full text Add to dashboard Cite

The mixing quality of a solid-liquid stirred tank operating in the turbulent regime was investigated, numerically and to an extent experimentally. Simulations were performed by coupling Computational Fluid Dynamics (CFD) and the Discrete Element Method (DEM). The results were evaluated against experimental data obtained using Electrical Resistance Tomography (ERT). This facilitated a novel and more rigorous assessment of CFD-DEM coupling – i.e. based on the spatial distribution of particle concentrations. Furthermore, a new mixing index definition was developed to quantify suspension quality to work in tandem with existing dispersion mixing indexes. This provides a more complete interpretation of mixing quality. In this work, it was found that the model underestimated suspension and dispersion due to model limitations associated with mesh size and fluid-particle interaction models. Furthermore, the predicted mixing quality was sensitive to changes in the drag model, including other fluid-particle interaction forces in simulations, and variations in certain particle properties

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“…Research methods is the leading cause of restricting the development of complex multiphase flow problems. The method of CFD-DEM coupling method which included key components and their interactions flow field models for the motion of the particles was recognized by many scholars and many works of literature focused on transport, grading, settlement, and motion of particle in the fluidized bed by CFD-DEM (Akhshik et al, 2016;Blais & Bertrand, 2017;Bravo-Blanco et al, 2017;Gupta & Ooi, 2016;Sinnott et al, 2017). At the same time, the method is also applied to the study of agricultural bulk material processing.…”

Section: Introductionmentioning

confidence: 99%

Optimization of airflow cylinder sieve for threshed rice separation using CFD-DEM

Yuan

¹

,

Li

²

,

Qi

³

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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The airflow cylinder sieve directly affects the harvesting effect as one of the main components of the rice combine harvester. The process of grain separated from threshed rice mixture is a multi-physical random pattern. This paper constructed accurately the components particle models, and reproduced the screening process of mixture via CFD-DEM (Computational Fluid Dynamics and Discrete Element Method). Objectives of this work are to better understand the impact of airflow velocity, aperture and deflectors of cylinder sieve on separation effect of the mixture in an airflow cylinder sieve device. The optimal working parameters of sieve were developed by the OED (Orthogonal Experiment Design) and the weight of the index method. The simulations result show that airflow velocity and aperture have an impact on the loss ratio and efficiency; deflectors have implications on efficiency. It is beneficial for separation of grain from the mixture with the airflow velocity, the aperture and deflectors are of 11m/s, 11mm, and two turns, correspondingly. The experiments result carried out on the test bench with real threshed rice mixture and agree with simulations, which proved the feasibility of the results. This paper provided basic data for the design of screening unite of rice harvester's equipment.

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Analysis of the incipient motion of spherical particles in an open channel bed, using a coupled computational fluid dynamics–discrete element method model

Cited by 6 publications

References 43 publications

A Novel Approach For Analyzing Mixing Quality In Solid-Liquid Stirred Tanks Via Coupled Computational Fluid Dynamics - Discrete Element Method And Electrical Resistance Tomography

A Novel Approach For Analyzing Mixing Quality In Solid-Liquid Stirred Tanks Via Coupled Computational Fluid Dynamics - Discrete Element Method And Electrical Resistance Tomography

A Novel Approach For Analyzing Mixing Quality In Solid-Liquid Stirred Tanks Via Coupled Computational Fluid Dynamics - Discrete Element Method And Electrical Resistance Tomography

Optimization of airflow cylinder sieve for threshed rice separation using CFD-DEM

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