Rheology of gas–solid fluidized bed

Coal dry beneficiation with gas–solid fluidized beds belongs to dry dense medium separation. It is important for us to study the rheological behaviors of gas–solid fluidized beds. In this paper, the viscosity of fluidized beds was measured by the solid-settling experiments. The rheological characteristics of fluidized beds can be described with Bingham fluid model. The effective viscosity of fluidized beds can be calculated. The plastic viscosity and yield stress of fluidized beds can be obtained by linear regression analysis of the experimental data. The calculated results agree with the experimental data well.