Velocity-sensitised Magnetic Resonance Imaging of foams
Although flowing foams are used in a variety of technologies, foam rheology is still incompletely understood. In this paper we demonstrate the use of a velocity-sensitised magnetic resonance imaging (MRI) sequence for the study of flowing foam. We employ a constant-time (pure phase encode) imaging t...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Universitätsbibliothek Leipzig
2015
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| Subjects: | |
| Online Access: | http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-184242 http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-184242 http://www.qucosa.de/fileadmin/data/qucosa/documents/18424/diff_fund_18%282013%295.pdf |
| Summary: | Although flowing foams are used in a variety of technologies, foam rheology is still incompletely understood. In this paper we demonstrate the use of a velocity-sensitised magnetic resonance imaging (MRI) sequence for the study of flowing foam. We employ a constant-time (pure phase encode) imaging technique, SPRITE, which is immune to geometrical distortions caused by the foam-induced magnetic field inhomogeneity. The sample magnetisation is prepared before the SPRITE imaging with the Cotts 13-interval motion-sensitisation sequence, which is also insensitive to the effects of the foam heterogeneity. We measure the development of a power-law velocity profile in the foam downstream of a Venturi constriction (in which the cross-section of the tube decreases by 89% in area) in a vertical, cylindrical pipe. |
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