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Title: High-speed X-ray tomography of silo discharge
Author(s): Stannarius, Ralf
Sancho Martinez, Diego
Börzsönyi, Tamás
Bieberle, Martina
Barthel, Frank
Hampel, Uwe
Issue Date: 2019
Type: Article
Language: English
URN: urn:nbn:de:gbv:ma9:1-1981185920-370477
Subjects: Granular materials
Ultrafast x-ray computed tomography
Silo discharge
Abstract: The outflow of granular materials from storage containers with narrow outlets is studied by means of ultrafast x-ray computed tomography (UFXCT). The used acquisition speed of this tomograph is high enough to allow high-speed recording of two horizontal cross sections (each of them at a rate of 1000 images per second) of the container during the discharge of material. Analyzing space-time plots that were generated from the tomograms, we retrieve velocity profiles and packing structures in the container.Wecompare hard spherical grains with soft, low-friction hydrogel spheres. Their flow profiles are qualitatively different. While the hard spheres form stagnant zones at the container side walls, the hydrogel spheres with extremely low friction coefficient flow in all regions of the container. Moreover, a shell-like positional arrangement of the soft spheres induced by the container walls is revealed. The results obtained for the flow field structure confirm earlier conclusions drawn from sequences of x-ray tomograms of clogged states.
Open Access: Open access publication
License: (CC BY 4.0) Creative Commons Attribution 4.0(CC BY 4.0) Creative Commons Attribution 4.0
Sponsor/Funder: DFG-Publikationsfonds 2019
Journal Title: New journal of physics
Publisher: Dt. Physikalische Ges.
Publisher Place: [Bad Honnef]
Volume: 21
Issue: 2019
Original Publication: 10.1088/1367-2630/ab5893
Page Start: 1
Page End: 13
Appears in Collections:Fakultät für Naturwissenschaften (OA)

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