The extents of axial gas mixing for turbulent fluidization

fast fluidization and dilute phase transport regimes in a circulating fluidized bed testing unit of 90mm inside diameter and 8m height were measured and characterized by dynamic response technique consisting of tracer pulsed input

dual probe detection and computer on-line analysis system. Experimental results indicated that the extents of axial gas mixing were related to the bed voidage mainly determined by both the gas velocity and the solids circulating rate. A one dimensional pseudo-homogeneous dispersion model was used with the least squares method in time domain to fit in with the experimental data. As a result

a generalized correlation of the gas dispersion coefficient is obtained: