The characteristics of a 60 mm I. D. fluidized bed with baffles are studied using particles belonging to group B in Geldarts classifcation. Experimental results of pressure drop

pressure drop fluctuation bed expansion and RTD of gas show that the behavior of fluidization varies with changing gas velocity. Apparently it can be devided into two regions

i. e. bubbling and turbulent regions. It is suggested that a critical point exists between the bubbling and the turbulent regions

this point may be referred to as the critical turbulent fluidized point. The critical turbulent fluidization velocity un corresponding to this point can be expressed by the following equation: Ren = 0.1358p?6576GaP0.5120 inwhich

Ren=undppf/μ;Gap=dp3Pf2g/μ2; ρ=ρs/ρf This equation can be used as a criterion for the static turbulent fluidization region in fluidized beds with baffles. Its error is less than 10%.