Enhancement of large-particle gas-fluidization by adding liquid



There are circumstances where fluidization of particles by a gas can be promoted by the addition of small quantities of liquid, contrary to many reported cases where liquid impedes gas-solid fluidization. Enhancement occurs only when the particles are larger than about 3 mm in diameter, the liquid and particles have similar densities (within ∼25%), and the particles are poorly wetted by the liquid. When these conditions are met, the liquid causes the minimum gas fluidization velocity Ugmf to decrease and particle motion to be more vigorous. For low liquid loadings, Ugmf and the pressure drop across the bed are then predicted well by a “modified liquid-perturbed gas model.”