title: Rheo-NMR of the secondary flow of non-Newtonian fluids in square ducts.
abstract: We report the first real-time observations of the entire fully developed laminar secondary flow field of aqueous 2% Viscarin GP-209NF (a λ-carrageenan polysaccharide) in a square duct as made using a modest rheological NMR imaging (rheo-NMR) apparatus. Simulations using the Reiner-Rivlin constitutive equation verify the results. An included rheo-NMR flow rate quantification study assesses the measurement precision. Rheo-NMR resolves slow flows superimposed on primary flows about 300 times greater, making it a universally accessible technique by which full secondary flow field data may be systematically gathered.
authors.affiliation: Department of Physics, University of Guelph, Guelph, ON, Canada. cschroed@uoguelph.ca
authors.forename: Christian B
authors.initials: CB
authors.lastname: Schroeder
authors.forename: Kenneth R
authors.initials: KR
authors.lastname: Jeffrey