title: Rapid imaging of fluid flow patterns in a narrow packed bed using MRI.
abstract: A gradient echo rapid velocity and acceleration imaging sequence (GERVAIS) has been developed and implemented to image liquid flow within a narrow packed bed. Two-dimensional velocity images have been acquired with an in-plane pixel size of 781 microm x 781 microm, with a data acquisition time of 20 ms for a single velocity component. Images of the x, y and z velocity vectors are reported. Data are reported for Reynolds numbers (based on particle diameter) of 200 and 300. In each case, GERVAIS images are compared with the results of a standard spin-echo phase-encoding velocity measurement. At Re = 200, steady-state flow is expected and the velocity images acquired using both techniques are consistent. At Re = 300, the GERVAIS sequence is able to image the unsteady-state flow field within this system. In contrast, the standard phase-encoding velocity measurement contains significant artefacts.
authors.affiliation: Department of Chemical Engineering, University of Cambridge, Cambridge CB2 3RA, UK.
authors.forename: Mark C
authors.initials: MC
authors.lastname: Sains
authors.forename: M Samir
authors.initials: MS
authors.lastname: El-Bachir
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Sederman
authors.forename: Lynn F
authors.initials: LF
authors.lastname: Gladden
mesh_terms: D016477:Artifacts; D008279:Magnetic Resonance Imaging / Q000379:methods*; D010316:Particle Size; D019904:Polymethyl Methacrylate; D012212:Rheology
chemical_list: D019904:Polymethyl Methacrylate