Transverse mixing of ellipsoidal particles in a rotating drum

Siyuan He, Jieqing Gan, David Pinson, Zongyan Zhou

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

4 Citations (Scopus)

Abstract

Rotating drums are widely used in industry for mixing, milling, coating and drying processes. In the past decades, mixing of granular materials in rotating drums has been extensively investigated, but most of the studies are based on spherical particles. Particle shape has an influence on the flow behaviour and thus mixing behaviour, though the shape effect has as-yet received limited study. In this work, discrete element method (DEM) is employed to study the transverse mixing of ellipsoidal particles in a rotating drum. The effects of aspect ratio and rotating speed on mixing quality and mixing rate are investigated. The results show that mixing index increases exponentially with time for both spheres and ellipsoids. Particles with various aspect ratios are able to reach well-mixed states after sufficient revolutions in the rolling or cascading regime. Ellipsoids show higher mixing rate when rotational speed is set between 25 and 40 rpm. The relationship between mixing rate and aspect ratio of ellipsoids is established, demonstrating that, particles with aspect ratios of 0.5 and 2.0 achieve the highest mixing rates. Increasing rotating speed from 15 rpm to 40 rpm does not necessarily increase the mixing speed of spheres, while monotonous increase is observed for ellipsoids.

Original languageEnglish
Title of host publicationEPJ Web of Conferences
Subtitle of host publicationPowders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media
EditorsFarhang Radjai, Saeid Nezamabadi, Stefan Luding, Jean-Yves Delenne
PublisherEDP Sciences
Number of pages4
Volume140
DOIs
Publication statusPublished - 30 Jun 2017
EventPowders and Grains 2017 - Montpellier, France
Duration: 3 Jul 20177 Jul 2017
Conference number: 8th
http://pg2017.org/en/

Conference

ConferencePowders and Grains 2017
CountryFrance
CityMontpellier
Period3/07/177/07/17
Internet address

Cite this

He, S., Gan, J., Pinson, D., & Zhou, Z. (2017). Transverse mixing of ellipsoidal particles in a rotating drum. In F. Radjai, S. Nezamabadi, S. Luding, & J-Y. Delenne (Eds.), EPJ Web of Conferences : Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media (Vol. 140). [06018] EDP Sciences. https://doi.org/10.1051/epjconf/201714006018
He, Siyuan ; Gan, Jieqing ; Pinson, David ; Zhou, Zongyan. / Transverse mixing of ellipsoidal particles in a rotating drum. EPJ Web of Conferences : Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media. editor / Farhang Radjai ; Saeid Nezamabadi ; Stefan Luding ; Jean-Yves Delenne. Vol. 140 EDP Sciences, 2017.
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abstract = "Rotating drums are widely used in industry for mixing, milling, coating and drying processes. In the past decades, mixing of granular materials in rotating drums has been extensively investigated, but most of the studies are based on spherical particles. Particle shape has an influence on the flow behaviour and thus mixing behaviour, though the shape effect has as-yet received limited study. In this work, discrete element method (DEM) is employed to study the transverse mixing of ellipsoidal particles in a rotating drum. The effects of aspect ratio and rotating speed on mixing quality and mixing rate are investigated. The results show that mixing index increases exponentially with time for both spheres and ellipsoids. Particles with various aspect ratios are able to reach well-mixed states after sufficient revolutions in the rolling or cascading regime. Ellipsoids show higher mixing rate when rotational speed is set between 25 and 40 rpm. The relationship between mixing rate and aspect ratio of ellipsoids is established, demonstrating that, particles with aspect ratios of 0.5 and 2.0 achieve the highest mixing rates. Increasing rotating speed from 15 rpm to 40 rpm does not necessarily increase the mixing speed of spheres, while monotonous increase is observed for ellipsoids.",
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He, S, Gan, J, Pinson, D & Zhou, Z 2017, Transverse mixing of ellipsoidal particles in a rotating drum. in F Radjai, S Nezamabadi, S Luding & J-Y Delenne (eds), EPJ Web of Conferences : Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media. vol. 140, 06018, EDP Sciences, Powders and Grains 2017, Montpellier, France, 3/07/17. https://doi.org/10.1051/epjconf/201714006018

Transverse mixing of ellipsoidal particles in a rotating drum. / He, Siyuan; Gan, Jieqing; Pinson, David; Zhou, Zongyan.

EPJ Web of Conferences : Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media. ed. / Farhang Radjai; Saeid Nezamabadi; Stefan Luding; Jean-Yves Delenne. Vol. 140 EDP Sciences, 2017. 06018.

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

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N2 - Rotating drums are widely used in industry for mixing, milling, coating and drying processes. In the past decades, mixing of granular materials in rotating drums has been extensively investigated, but most of the studies are based on spherical particles. Particle shape has an influence on the flow behaviour and thus mixing behaviour, though the shape effect has as-yet received limited study. In this work, discrete element method (DEM) is employed to study the transverse mixing of ellipsoidal particles in a rotating drum. The effects of aspect ratio and rotating speed on mixing quality and mixing rate are investigated. The results show that mixing index increases exponentially with time for both spheres and ellipsoids. Particles with various aspect ratios are able to reach well-mixed states after sufficient revolutions in the rolling or cascading regime. Ellipsoids show higher mixing rate when rotational speed is set between 25 and 40 rpm. The relationship between mixing rate and aspect ratio of ellipsoids is established, demonstrating that, particles with aspect ratios of 0.5 and 2.0 achieve the highest mixing rates. Increasing rotating speed from 15 rpm to 40 rpm does not necessarily increase the mixing speed of spheres, while monotonous increase is observed for ellipsoids.

AB - Rotating drums are widely used in industry for mixing, milling, coating and drying processes. In the past decades, mixing of granular materials in rotating drums has been extensively investigated, but most of the studies are based on spherical particles. Particle shape has an influence on the flow behaviour and thus mixing behaviour, though the shape effect has as-yet received limited study. In this work, discrete element method (DEM) is employed to study the transverse mixing of ellipsoidal particles in a rotating drum. The effects of aspect ratio and rotating speed on mixing quality and mixing rate are investigated. The results show that mixing index increases exponentially with time for both spheres and ellipsoids. Particles with various aspect ratios are able to reach well-mixed states after sufficient revolutions in the rolling or cascading regime. Ellipsoids show higher mixing rate when rotational speed is set between 25 and 40 rpm. The relationship between mixing rate and aspect ratio of ellipsoids is established, demonstrating that, particles with aspect ratios of 0.5 and 2.0 achieve the highest mixing rates. Increasing rotating speed from 15 rpm to 40 rpm does not necessarily increase the mixing speed of spheres, while monotonous increase is observed for ellipsoids.

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PB - EDP Sciences

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He S, Gan J, Pinson D, Zhou Z. Transverse mixing of ellipsoidal particles in a rotating drum. In Radjai F, Nezamabadi S, Luding S, Delenne J-Y, editors, EPJ Web of Conferences : Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media. Vol. 140. EDP Sciences. 2017. 06018 https://doi.org/10.1051/epjconf/201714006018