Abstract
A theoretical analysis has been made of the rate of deaeration of a dilated bed of fine particles. The work is relevant to the phenomenon of flooding, since flooding is said to occur only when the material is dilated. This analysis is more general than previous analyses, and makes allowance for the change in bed depth as well as the change in bulk properties occurring during deaeration. A test case has shown that deaeration is a two-stage process. In the first stage, settlement of the bed occurs with the voidage approaching its final value fairly rapidly. At the end of this stage, elevated interstitial pressures still occur within the bed and these subsequently decay over a longer time-scale. Generalised predictions are given for the time-scale of the deaeration process as functions of the bed geometry and material properties.
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