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X-ray rheography uncovers planar granular flows despite non-planar walls

Baker, J, Guillard, F, Marks, B and Einav, I (2018) X-ray rheography uncovers planar granular flows despite non-planar walls. Nature Communications, 9 (1). ISSN 2041-1723

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Open Access URL: https://doi.org/10.1038/s41467-018-07628-6 (Published version)


Extremely useful techniques exist to observe the interior of deforming opaque materials, but these methods either require that the sample is replaced with a model material or that the motion is stopped intermittently. For example, X-ray computed tomography cannot measure the continuous flow of materials due to the significant scanning time required for density reconstruction. Here we resolve this technological gap with an alternative X-ray method that does not require such tomographs. Instead our approach uses correlation analysis of successive high-speed radiographs from just three directions to directly reconstruct three-dimensional velocities. When demonstrated on a steady granular system, we discover a compressible flow field that has planar streamlines despite curved confining boundaries, in surprising contrast to Newtonian fluids. More generally, our new X-ray technique can be applied using synchronous source/detector pairs to investigate transient phenomena in various soft matter such as biological tissues, geomaterials and foams.

Item Type: Article
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Q Science > QC Physics
Divisions: Computer Science & Mathematics
Publisher: Springer Science and Business Media LLC
SWORD Depositor: A Symplectic
Date Deposited: 20 Mar 2023 12:28
Last Modified: 20 Mar 2023 12:28
DOI or ID number: 10.1038/s41467-018-07628-6
URI: https://researchonline.ljmu.ac.uk/id/eprint/19139
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