Abstract
The effect of pressure on thephenomenon of formation of gas bubbles in a polydisperse bed of granular materials has been investigated. The experiments have been carried out at pressures of 0.1, 2.2, 4.2 and 6.3 MN/m 2 for 13 mixtures of particles of coal and char, differing in their granular composition. The effect of the granular composition of mixtures upon the minimum bubbling velocity has been presented in the form of phase diagrams and a correlation for minimum bubbling velocity, valid in the pressure range investigated, has been proposed. The suitability of available correlation equations, concerning the transition from particulate fluidization to aggregative fluidization, has also been discussed.
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