Simulation of Solid Suspension in a Stirred Tank Using CFD-DEM Coupled Approach

“…Accounts for difference in pressure due to buoyancy of particles and acceleration of fluid [85] Virtual Mass Required to displace fluid around accelerating particles [89] Basset Accounts for lagging development of the viscous boundary layer around accelerating particles [90] Saffman Accounts for difference in pressure due to shear flows acting on non-rotating particles [91] Magnus Accounts for difference in pressure due to rotation of particles in uniform flows [92] Lubrication Hinders particles, in close proximity, from moving towards or away from each other due to presence of interstitial fluid [93] In the majority of cases, the drag force is significant and dominant. Therefore, it is always taken into consideration.…”

Section: Pressure Gradientmentioning

confidence: 99%

“…the CFD time step divided by the DEM time stepbe greater than 10 but less than 1000 [101]. Although, typical values found in solid-liquid systems have ranged from 10 to 100 [92], [102]- [109].…”

Section: Mesh Size and Time Step Restrictionsmentioning

confidence: 99%

“…For these reasons, commercial software is quite popular and has been used in numerous papers. In the context of CFD-DEM coupling, a common combination is that between ANSYS FLUENT and EDEM [92], [109], [111]- [113]. However, it should be noted that commercially available coupling modules are not currently designed for parallel computing [111].…”

Section: Simulation Softwarementioning

confidence: 99%

“…This was possible due to their significantly lower particle concentration. Shao et al [92] investigated the influence of the Magnus lift force on the hydrodynamic behaviors of 0.3 mm glass beads suspended in water. In their CFD-DEM simulations, it was found that the Magnus lift force was significant compared to the drag force.…”

Section: Specifically When Compared To Experimental Data Obtained Using Positron Emissionmentioning

confidence: 99%

See 2 more Smart Citations

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

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

show abstract

Study of free‐surface and solids suspension in top‐sealed tanks stirred by pitched blade turbine impellers through DEM‐VOF method

Bao

Kang

Wang

et al. 2022

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

A coupled method of discrete element method (DEM) and volume of fluid (VOF) is applied to study the particle suspension in top‐sealed solid–liquid tanks with a free‐surface. VOF is used to track the gas–liquid free‐surface, and DEM is used to calculate the movement and interaction of particles. As the air between the cover and free‐surface in a sealed tank is very limited, the free‐surface evolution process that a big vortex is generated quickly and then shrinks to a smaller one in sealed stirred tanks is reported first in this paper. In addition, the effects of pitched blade turbine (PBT) with different blade pitched angles (including 30°, 45°, 60°, 75°, and 90°) on solid suspension, free‐surface, and power number are investigated. Finally, the relationships between particle motion and fluid flow during the stirring are studied carefully. Fluid flow plays a dominant role during the start‐up of the stirring; and then, due to the contact of particles, some particles could obtain the larger velocity than the fluid. The results obtained here are helpful to design the sealed stirred tanks with PBT.

show abstract

Simulation of Solid Suspension in a Stirred Tank Using CFD-DEM Coupled Approach

Cited by 46 publications

References 24 publications

Power consumption and flow field characteristics of a coaxial mixer with a double inner impeller

Power consumption and flow field characteristics of a coaxial mixer with a double inner impeller

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

Study of free‐surface and solids suspension in top‐sealed tanks stirred by pitched blade turbine impellers through DEM‐VOF method

Contact Info

Product

Resources

About