title: Real-time measurement of bubbling phenomena in a three-dimensional gas-fluidized bed using ultrafast magnetic resonance imaging.
abstract: Ultrafast magnetic resonance imaging has been applied for the first time to measure simultaneously both the rise velocities and coalescence of bubbles, and the dynamics of the solid phase in a gas-solid two-phase flow. Here, we consider the hydrodynamics within a gas-fluidized bed of particles of diameter 0.5 mm contained within a column of internal diameter 50 mm; gas velocities in the range of 0.18-0.54 m/s were studied. The data are of sufficient temporal and spatial resolution that bubble size and the evolution of bubble size and velocity following coalescence events are determined.
authors.affiliation: Department of Chemical Engineering, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, United Kingdom.
authors.forename: C R
authors.initials: CR
authors.lastname: Müller
authors.forename: J F
authors.initials: JF
authors.lastname: Davidson
authors.forename: J S
authors.initials: JS
authors.lastname: Dennis
authors.forename: P S
authors.initials: PS
authors.lastname: Fennell
authors.forename: L F
authors.initials: LF
authors.lastname: Gladden
authors.forename: A N
authors.initials: AN
authors.lastname: Hayhurst
authors.forename: M D
authors.initials: MD
authors.lastname: Mantle
authors.forename: A C
authors.initials: AC
authors.lastname: Rees
authors.forename: A J
authors.initials: AJ
authors.lastname: Sederman