On the continuum modeling of dense granular flow in high shear granulation

Abrahamsson, Per; Sasic, Srdjan; Rasmuson, Anders

doi:10.1016/j.powtec.2014.08.057

Cited by 14 publications

(4 citation statements)

References 42 publications

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“…However, in this work a new modeling framework is developed and the method it is not dependent on the specific choice of flow model. More accurate models for dense granular flows are needed and under development [13][14][15][16] for more reliable results. The present modeling framework is, however, not affected by the detailed flow modeling and in future work more accurate flow simulations can easily be incorporated.…”

Section: Figure 1 Side and Top View Of The Two Regions In The Granulmentioning

confidence: 99%

“…The continuum approach to particle flows in high shear granulation was first used by Darelius et al [9] and Ng et al [10]. This has further been studied by Abrahamsson et al [11][12][13] and developed by Khalilitehrani et al [14][15][16] which shows promising results but also a need for further development. The HSG process is a continuously changing system where the continuous changes in particle properties are bound to affect the flow field and vice versa.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of mesoscale effects in high-shear granulation through a computational fluid dynamics–population balance coupled compartment model

et al. 2018

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In high shear granulation it has been pointed out that there is a need for meso-scale resolution and coupling between flow field information and the evolution of particle properties. In this article we develop a modelling framework that compartmentalizes the high shear granulation process based on process relevant parameters both in time and space. It is built up by a coupled flow field and population balance solver and is used to resolve and analyze the effects of meso-scales on the evolution of particle properties. A Diosna high shear mixer is modelled with micro crystalline cellulose powder as the granulation material. The analysis of the flow field solution and compartmentalization allows for a resolution of the stress and collision peak at the impeller blades. Different compartmentalizations were done showing the importance of resolving the impeller region, both for only aggregating systems and systems with breakage. An investigation on the time evolution of the flow field depending on the changing particle properties was also done, indicating the importance of resolving meso scale phenomena in time as well as space.

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Section: Figure 1 Side and Top View Of The Two Regions In The Granulmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of mesoscale effects in high-shear granulation through a computational fluid dynamics–population balance coupled compartment model

et al. 2018

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“…Depending on the concentration of actives ingredients, the units employed for powder mixing are based on different transport mechanisms, such as diffusion, and convection [7]. Currently, the predictions about the behavior of powder are based on continuum mechanics [8][9][10][11][12][13][14][15][16][17][18] and discrete element methods [1,19]. The latter has the constraint that requires a high computational power when the number of particles in the system is excessively high.…”

Section: Introductionmentioning

confidence: 99%

“…Zhao and Massoudi [21], studied the flow of granular materials between two shearing plates, subjected to slip at the walls. Abrahamsson et al [8] studied the continuum modeling of dense granular flow in a Couette shear cell in 2D.…”

Section: Introductionmentioning

confidence: 99%

Simulation of a Compressible Powder Flow under Oscillatory Shear Stress Modeled as a Non - Linear Fluid by Using an Explicit Solution Method

Robledo¹,

Quiñones²

2018

JESTR

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The purpose of this research is to develop the modeling and simulation of a frictional and compressible powder flow subjected to oscillatory shear stress in a device that consists of a rectangular shaped cavity with a free surface, two oscillatory moving walls, and three non-moving walls. The finite differences method under the explicit scheme is used to approximate the real solution to the resulting equations from the mathematical modeling of the studied system. The simulation results were compared qualitatively with experimental results, and the solution method was verified by comparing the simulation results of a viscous glycerin flow with the results of the software STAR-CCM+ under the same conditions of the powder flow. The results showed that the powder velocity profiles were coherent with the experimental results. Furthermore, the solution method was validated finding that the 83.5% of the compared data presented absolute errors less than 0.5 cm/s. The complete velocity profiles obtained from the simulation help to have a deep understanding of the granular material behavior subjected to oscillatory shear stress.

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