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High-speed X-ray tomography of silo discharge

Stannarius, R.; Sancho Martinez, D.; Boerzsoenyi, T.; Bieberle, M.; Barthel, F.; Hampel, U.

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 (1000 fps) is high enough to allow high-speed recording of horizontal cross sections 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. We compare hard spherical grains with soft, low-frictional hydrogel spheres. Their flow profiles are qualitatively different. While the hard spheres form stagnant zones at the container side walls, the hydrogel spheres 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.

Keywords: Ultrafast X-ray CT; silo flow

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Permalink: https://www.hzdr.de/publications/Publ-29464
Publ.-Id: 29464