Abstract
By the wall pressure signal, ∆px, from a nonuniformly fluidized bed is here termed the excess pressure at a wall of open column over the atmospheric pressure measured at a distance x from distributor. The relation was investigated between the wall pressure signal, ∆px, and some specifically defined voidages of a so-called standard bubbling bed characterized by the fact that the ratio of the experimentally determined pressure drop for minimum fluidization, ∆p0,mf, and of the theoretical pressure drop, ∆pt, is approximately equal to the unity. We have shown that under certain conditions, the time-volume averaged voidage, ε, of this bed can be determined in terms of simple relation (13).
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