Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

By the wall pressure signal, ∆p_x, 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, ∆p_x, 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, ∆p_0,mf, and of the theoretical pressure drop, ∆p_t, 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).