Rheology of gas-solid fluidized bed

Coal dry beneficiation with gas-solid fluidized beds belongs to dry dense m edium separation. It is important for us to study the rheological behaviors of gas-solid fluidized beds. In this paper, the viscosity of fluidized bed s was measured by the solid-settling experiments. The rheological character istics of fluidized beds can be described with Bingham fluid model. The eff ective viscosity of fluidized beds can be calculated. The plastic viscosity and yield stress of fluidized beds can be obtained by Linear regression an alysis of the experimental data. The calculated results agree with the expe rimental data well. (C) 2000 Elsevier Science B.V. All rights reserved.