Individual phase holdups were measured in three phase fluidized beds of mixed particles having binary size distributions.
The bed contraction phenomena, which have been observed in the beds of small monosized particles, could not be found for some mixtures of solid particles at the same experimental conditions. The variation of bed porosity and liquid phase holdups showed miniumm values depending upon the variation of weight fraction of the component particles.
The minimum fluidizing velocity of the mixed particle systems was comparatively lower than that of the large particle component only.
Results were summarized with dimensionless correlations, in terms of fluid Reynolds and Froude numbers based on harmonic mean particle diameter, which can be applicable to both monosized and mixed particle systems.