title: Hydrodynamics in two-phase flow within porous media.
abstract: Ultra-fast magnetic resonance imaging techniques are used to image liquid distribution in two and three dimensions during air-water co-current down flow through a fixed bed of cylindrical porous pellets of length and diameter 3 mm, packed within a 43 mm internal diameter column in both the trickle- and pulsing-flow regimes. The data acquisition times used were 20 and 280 ms, giving 2-D and 3-D spatial resolutions of 1.4 mm x 2.8 mm and 3.75 mm x 3.75 mm x 1.87 mm, respectively. This work reports images of local pulsing events within the bed occurring during the trickle-to-pulse flow transition. The evolution of the local instabilities is studied as a function of increasing liquid velocity at constant gas velocity.
authors.affiliation: University of Cambridge, Department of Chemical Engineering, Pembroke Street, Cambridge CB2 3RA, UK.
authors.forename: Laura D
authors.initials: LD
authors.lastname: Anadon
authors.forename: Matthew H M
authors.initials: MH
authors.lastname: Lim
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Sederman
authors.forename: Lynn F
authors.initials: LF
authors.lastname: Gladden
mesh_terms: D004058:Diffusion; D008279:Magnetic Resonance Imaging / Q000379:methods; D016062:Porosity; D012212:Rheology; D014867:Water
chemical_list: D014867:Water