Using a modulated flux technique, radiant transmission through packed and fluidized beds of 820- and 440-u.m glass beads was measured. An increase in transmission was observed in going from a packed bed to a minimally fluidized bed for the smaller particles. At velocities greater than minimum fluidization, increases were found to vary directly with void fraction. The two-flux model for radiative transfer, with absorption and scattering coefficients determined from large-particle independent scattering theory, underpredicted transmission and the effects of void fraction
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