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Numerical study of the sedimentation of spheroidal particles
KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-4346-4732
2016 (English)In: International Journal of Multiphase Flow, ISSN 0301-9322, E-ISSN 1879-3533, Vol. 87, 16-34 p.Article in journal (Refereed) Published
Abstract [en]

The gravity-driven motion of-rigid particles in a viscous fluid is relevant in many natural and industrial processes, yet this has mainly been investigated for spherical particles. We therefore consider the sedimentation of non-spherical (spheroidal) isolated and particle pairs in a viscous fluid via numerical simulations using the Immersed Boundary Method. The simulations performed here show that the critical Galileo number for the onset of secondary motions decreases as the spheroid aspect ratio departs from 1. Above this critical threshold, oblate particles perform a zigzagging motion whereas prolate particles rotate around, the vertical axis while having their broad side facing the falling direction. Instabilities of the vortices in the wake follow when farther increasing the Galileo number. We also study the drafting kissing-tumbling associated with the settling of particle pairs. We find that the interaction time increases significantly for non-spherical particles and, more interestingly, spheroidal particles are attracted from larger lateral displacements. This has important implications for the estimation of collision kernels and can result its increasing clustering in suspensions of sedimenting spheroids.

Place, publisher, year, edition, pages
2016. Vol. 87, 16-34 p.
Keyword [en]
Non-spherical particles, Sedimentation, Particle pair interactions, Drafting-kissing-tumbling, Numerical modelling
National Category
Applied Mechanics
URN: urn:nbn:se:kth:diva-196969DOI: 10.1016/j.ijmultiphaseflow.2016.08.005ISI: 000386645300003ScopusID: 2-s2.0-84985916725OAI: diva2:1056010

QC 20161213

Available from: 2016-12-13 Created: 2016-11-28 Last updated: 2016-12-13Bibliographically approved

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Ardekani, Mehdi NiaziBrandt, Luca
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SeRC - Swedish e-Science Research CentreLinné Flow Center, FLOW
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