Abstract
DAVIDSON et al. 1 have noted a marked similarity between the behaviour of gas bubbles injected into beds of solids which were gently fluidized and gas bubbles rising in a liquid. Within the narrow range of main fluidizing air velocity used for beds of glass beads, silver sand and swede seeds, the velocity of rise of bubbles, U, was found to depend only on the volume of the bubble, V, and agreed with the semi-empirical formula : derived by Davies and Taylor2 for spherical capped gas bubbles in an inviscid liquid.
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