A study was made on the capture of monodispersed aerosol particles in the size range 0.8 ‐ 2.9 μm, in a screen‐supported fixed bed, and in a fixed and a fluidized bed supported on a grid of low superficial area (0.56%). All beds were composed of glass beads of mean size 425 μm. Relatively high capture efficiency was observed in the grid regions of both fixed and fluidized beds supported in this manner, with relatively lower capture efficiency observed in the vicinity of the screen. Aerosol capture efficiency per unit of bed volume in the body of the fixed beds was not significantly affected by the method of support, and was larger than was the case with the fluidized bed. An estimate of aerosol capture efficiency at the grid jets, based on an equivalent pneumatic transport line concept, was in reasonable agreement with experiment.

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