Stability of uniform fluidization revisited

摘要: Abstract The marginal stability of uniform gas-fluidized beds is analyzed making use ‘macroscopic’ conservation equations based on a recent version the theory random particulate motion in dense, collisional suspensions. This theory, developed by Buyevich and Kapbasov, combines standard correlation stationary processes, applied to stochastic for fluctuations flow properties, generalization, dense suspensions, classical Smoluchowski's particle concentration. It shown that, within framework adopted approach, fluidization can be explained without reference hypothetical solid-like state phase. criterion derived form critical volume fraction as function non-dimensional parameter controlling dissipation, interparticle collisions, kinetic energy velocity fluctuations. wavenumbers perturbations with maximum growth rate unstable fluidized bed are analyzed. Such usually associated initial sizes emerging bubbles; these obtained functions concentration above mentioned inelasticity collisions. Recent theoretical studies led conclusion that apparent cannot taking into account yield stress caused direct contacts. approach this paper provides an explanation invoking non-hydrodynamic phenomena (except collisions).