Studies on granular materials. I. Kinematics of granular materials mixed by a mechanical impeller

Novosád, Jan

doi:10.1135/cccc19642681

Cited by 14 publications

(4 citation statements)

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“…The cylindrical flow patterns are also similar to those obtained by photographing bladed particles through a transparent wall in previous experimental studies 6. 15 Interestingly, these flow features do not change with particle size, particle density, volume fraction and blade speed. However, quantitatively the velocity field may differ.…”

Section: Resultssupporting

confidence: 83%

Segregation of binary mixture of particles in a bladed mixer

Zhou

Bridgwater

2003

J of Chemical Tech & Biotech

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This paper presents a numerical study of the flow and segregation of particles over flat blades in a vertical cylindrical mixer by means of a modified discrete element method. Simulations are conducted using a binary mixture of spheres, where the blade's rotating speed, particle size, volume fraction and particle density are the variables considered. Similar flow features are found for all the cases considered: particles rise to form a heap in front of a blade and then either flow downward on the bed surface over the blade or to the base of the heap to rejoin the flow toward the blade, and there is a recirculating zone in front of the blade. However, different types of mixing behaviour can be observed. Particles with large size or light density are mainly in the top layer of the mixing bed, while small and heavy particles remain in the bottom of the mixing bed and in front of the blades. The segregation pattern resulting from size difference is not the same as that resulting from density difference. The force evolution in these two binary systems also differs, although at the initial stage large/light particles always receive a relatively larger vertical force than small/heavy particles, leading to segregation that can be maintained at the later stage. Decreasing the size or density difference promotes the mixing performance. Changing the blade speed affects the mixing kinetics but not the mixing quality.

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Section: Resultssupporting

confidence: 83%

Segregation of binary mixture of particles in a bladed mixer

Zhou

Bridgwater

2003

J of Chemical Tech & Biotech

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“…Novosad (1964aNovosad ( -c, 1968) and Novosad and Standart (1965) attempted to theoretically predict the slip planes (and the accompanying failure zones) for non-segregating, freeflowing powders. A blade rotating in a bed of powder was visually examined from outside and the slip planes were predicted using classical powder mechanical constructions.…”

Section: Review Of Liquid Slurry and Solid Mixing In Agricultural Inmentioning

confidence: 99%

A review on the continuous blending of powders

Pernenkil

Cooney

2006

Chemical Engineering Science

139

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“…In his work, J. Novosad [6,7] carried out an in experimental monitoring of a course of mixing of several kinds of bulk solids with a blade mixer. In his experiments, he used glass cylindrical chambers in a vertical arrangement.…”

Section: Introductionmentioning

confidence: 99%

The Use of Dem Simulation for Confirming the Process of Particulate Material Mixing

et al. 2018

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At the present time in the research of particulate materials, computer methods that work independently with individual particles are coming to the forefront. One such method is the Discrete Element Method – DEM, which is already widely used. Its usage, however, is complex, mostly due to the input data – what the properties of the researched material are, plus their interaction in processes. And despite the progress, it is still always necessary to validate the experimental equipment and to verify the individual simulations by an experimental measuring or by theoretical knowledge. This study focuses on the verification of the simulation of the mixing of a particulate material with the help of the DEM method, whereby simulations are compared with an experimental measurement and theoretic calculations. The theoretical calculation was carried out by the Novosad model, while the experimental material was granulated polyethylene with strictly defined mechanical-physical properties.

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Studies on granular materials. I. Kinematics of granular materials mixed by a mechanical impeller

Cited by 14 publications

References 0 publications

Segregation of binary mixture of particles in a bladed mixer

Segregation of binary mixture of particles in a bladed mixer

A review on the continuous blending of powders

The Use of Dem Simulation for Confirming the Process of Particulate Material Mixing

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