Abstract: A mathematical model of gas-solids flow behavior of a concurrent down-flow fast fluidization bed was established on the basis of hydrodynamics study. Experimental data of bed pressure and pressure gradient under different operating conditions of four kinds of particles were correlated to give an equation of model parameter Cd: where AK=(1 + 2.78/m) × 14.1/Fr The physical quantities characterizing concurrent gas-solids downflow were predicted with the model and C correlation and compared with measured ones. The model was found effective in describing the hydrodynamics of concurrent gas-solids downflow.

摘要： 对气—固两相流动的流体力学分析,建立了下行快速流化床气—固流动行为的数学模型.对四种颗粒在不同操作条件下的床层压力及压力梯度的实验测定,回归得到了模型参数C_d的关联式:C_d=AK·C_dAK=(l+2.78/m)×14.1/Fr由模型及C_d关联式,预测了描述气固并流向下运动的诸物理量,并与实测值比较,表明该模型可以较好地反映气—固并流向下运动的流体力学规律.