Velocity-sensitised Magnetic Resonance Imaging of foams

• Main Authors: Bos, Kevin J., Wilson, K. Gordon, Newling, Benedict
• Other Authors: University of New Brunswick, UNB MRI Centre, Dept. of Physics
• Format: Article
• Language: English
• Published: Universitätsbibliothek Leipzig 2015
• Subjects: Diffusion; Transport; diffusion; transport; ddc:530
• 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

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.