Parameter study of a kinetic-frictional continuum model of a disk impeller high-shear granulator

Abrahamsson, Per; Björn, Ingela Niklasson; Rasmuson, Anders

doi:10.1016/j.powtec.2012.07.015

Cited by 11 publications

(8 citation statements)

References 34 publications

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“…The properties of the granular material for the CFD Cases is set to mimic those of micro crystalline cellulose granules at different stages of a granulation [11], Table 1. Variations in the properties were then made in order to mimic the changes in particle properties as the granulation progresses.…”

Section: System Modeledmentioning

confidence: 99%

“…Variations in the properties were then made in order to mimic the changes in particle properties as the granulation progresses. This was done in accordance to [11] where the CFD cases are set up to mimic the evolution of the properties stated.…”

Section: System Modeledmentioning

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%

“…Abrahamsson et.al. [11] investigated the effects of changing particle properties on the flow field of a disc-impeller granulator to study the time discretization of a granulation. For the spatial discretization, compartment models have been developed and used within many other chemical engineering applications [17][18][19][20][21][22].…”

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: System Modeledmentioning

confidence: 99%

Section: System Modeledmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…The most common approach to modeling the powder flow conditions in granulators is currently discrete element modeling (DEM) [16,17]. In study [18], a multi-scale model for wet granulation processes was presented using DEM and PBM techniques.…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric analysis of disintegration mechanisms (abrasion and crushing) of agglomerates during the disc granulation of dolomite

Obraniak

Ławińska²

2017

Granular Matter

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The analysis of mechanisms which affect the formation of agglomerates and determine the granulation process in a broad sense encounters difficulties related to the many ways of the formation of granules. The aim of the study was to perform a qualitative and quantitative analysis of granulation mechanisms with special reference to agglomerates' disintegration in the disc granulation process. This paper contains an analysis of disintegration mechanisms (abrasion and crushing) of agglomerates during the disc granulation of dolomite. The analysis of the mechanisms taking place during the process concerns the granulation stage after wetting. During the research, each time after the wetting stage, the size fraction 10-12.5 mm was substituted with an analogous fraction wetted by means of an aqueous solution of a coloring agent and the process was continued. After the specified time of granulation, the obtained product was sieved through laboratory sieves and then the content of the provided coloring agent in different size fractions was analyzed by means of a spectrophotometer. Measuring the absorbance of the analyzed samples and granulometric composition of the bed, the level and cause of the migration of material of the tested fraction into other size classes were determined, and at the same time, the occurring granulation mechanisms were analyzed. The proposed model and measurement method consisting of determining the absorbance of the tested granulometric fraction enable the qualitative and quantitative analysis of granulation mechanisms are encountered during the carrying-out of the process after wetting the bed.

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A compartmental CFD‐PBM model of high shear wet granulation

Hounslow

Reynolds

et al. 2016

AIChE Journal

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The conventional, geometrically lumped description of the physical processes inside a high shear granulator is not reliable for process design and scale-up. In this study, a compartmental Population Balance Model (PBM) with spatial dependence is developed and validated in two lab-scale high shear granulation processes using a 1.9L MiPro granulator and 4L DIOSNA granulator. The compartmental structure is built using a heuristic approach based on computational fluid dynamics (CFD) analysis, which includes the overall flow pattern, velocity and solids concentration. The constant volume Monte Carlo approach is implemented to solve the multi-compartment population balance equations. Different spatial dependent mechanisms are included in the compartmental PBM to describe granule growth.It is concluded that for both cases (low and high liquid content), the adjustment of parameters (e.g. layering, coalescence and breakage rate) can provide a quantitative prediction of the granulation process.

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Parameter study of a kinetic-frictional continuum model of a disk impeller high-shear granulator

Cited by 11 publications

References 34 publications

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

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

Spectrophotometric analysis of disintegration mechanisms (abrasion and crushing) of agglomerates during the disc granulation of dolomite

A compartmental CFD‐PBM model of high shear wet granulation

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