Magnetic resonance studies of a gas–solids fluidised bed: Jet–jet and jet–wall interactions

Magnetic resonance imaging (MRI) gave images of air jets from orifices in the distributor plate of a bed of poppy seeds. Attention focused on two features:(1)The interaction between nearby vertical jets from two, three or four orifices;(2)Wall effects, where one or more orifices created vertical jets near the vertical wall of the cylinder containing the particle bed.The results show that nearby jets are mutually attracted. Likewise a jet near a wall bends out of the vertical, towards the wall. For multiple adjacent jets, the jet lengths show dependence on orifice layout: the lengths are in reasonable agreement with published measurements, by other methods, for single jets. The MRI gives three-dimensional images of the single jets and of multiple jets, separate or merging.

Greyscale intensity slices and 3D reconstructions of jets from a 3-hole linear distributor.Magnetic resonance imaging (MRI) gave images of air jets from orifices in the distributor plate of a bed of poppy seeds, showing that nearby jets are mutually attracted. Likewise a jet near a wall bends out of the vertical, towards the wall. For multiple jets, the jet lengths show dependence on orifice layout. The MRI gives three-dimensional images of the single jets and of multiple jets, separate or merging.Figure optionsDownload as PowerPoint slide