Cataracting-centrifuging transition investigation using nonspherical and spherical particles in a rotary drum through CFD simulations--颗粒学报PARTICUOLOGY

Benedito, W. M., Duarte, C. R., Barrozo, M. A. S., & Santos, D. A. (2022). Cataracting-centrifuging transition investigation using nonspherical and spherical particles in a rotary drum through CFD simulations. Particuology, 60, 48-60. https://doi.org/10.1016/j.partic.2021.03.012

Cataracting-centrifuging transition investigation using nonspherical and spherical particles in a rotary drum through CFD simulations

Wanessa M. Benedito ^a, Claudio R. Duarte ^b, Marcos A.S. Barrozo ^b, Dyrney A. Santos ^a *

a Institute of Chemistry, Federal University of Goiás - UFG, Campus Samambaia, Goiânia, GO, 74690-900, Brazil
b School of Chemical Engineering, Federal University of Uberlândia - UFU, Campus Santa Mônica, Uberlândia, MG, 38408-144, Brazil

10.1016/j.partic.2021.03.012

Volume 60, January 2022, Pages 48-60

Received 9 September 2020, Revised 15 March 2021, Accepted 17 March 2021, Available online 15 April 2021, Version of Record 23 October 2021.

E-mail: dyrney@ufg.br

Highlights

• The cataracting-centrifuging transition was systematically investigated.

• The drum length plays an important role in the cataracting-centrifuging transition.

• Nonspherical particles required lower critical rotation speeds for centrifuging.

• The particle shape was shown to be related to the critical solid friction.

Abstract

This paper aims to systematically investigate the cataracting-centrifuging transition in a rotary drum involving spherical and nonspherical particles by using the Multiphase Granular Eulerian Model (MGEM). The effects of drum length and particle shape on the cataracting-centrifuging transition behavior were analyzed. The results showed that drum length plays an important role in the cataracting-centrifuging transition, although most related works in the literature do not consider this. The particle shape also significantly affects the cataracting-centrifuging transition behavior. Nonspherical particles required lower rotation speeds than spherical particles to reach the centrifuging condition. The particle shape was shown to be related to the critical solid fraction (α_sc) from Schaeffer’s model, although further investigations are required to completely correlate particle spherecity with critical solid volume fractions.

Graphical abstract

Keywords

Frictional viscosity; MGEM model; Particle shape; Drum length; Drum flow regimes

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