Flash X-ray radiogrophy was used to study the internal structure of fluidized beds. Basic data were obtained on the density distribution and on void shapes, sizes, and velocities within an airsand bed. The doto obtained, in general, support the view of fluidized beds as consisting of liquidlike emulsions through which voids rise. Density measurements and void characteristics were in agreement with the two-phase flow theory and with more recent theories of fluid bed flow. Void velocities and shapes agreed with recent predictions that the dense phase behaves as a liquidlike emulsion of zero viscosity and surface tension.
E X P E R I M E N T A L ApparatusTwo existing flash X-ray facilities were used to obtain photographs of the bed internals. These units, which are designed for 300-and 600-kv. operation, could easily penetrate a few inches of solid fluidized material. Except for experiments involving void velocity measurements, only the 300-kv. unit was used.
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