Abstract
Air-fluidized beds of two types of powder (groups A and B of the Geldart classification) have been examined using X-rays and the voidage distributions around individual gas bubbles have been determined. The results show that the rising bubbles are surrounded by an expanded “shell” of particles in which the void fraction is considerably in excess of that of the emulsion phase remote from the bubbles. The extent of the shell is show to be greater than predicted by current theories relating to the steady motion of bubbles in fluidized beds. A simple model of bubble coalescence shows that the increase in size of the “visible” bubble volume is caused by inflow of gas from the shell region during the process.
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