Distribution of local phase holdups of gas-liquid-solid three-phase circulating fluidized beds

Local phase holdups in gas-liquid-solid three-phase circulating fluidized beds with glass beads(d_p=0.48 mm, ρ_s=2460 kg·m~(-3)) and styrene resin(d_p=1.45 mm,ρ_s=1264 kg·m~(-3)) as solid phases were measured simultaneously by the improved micro-conductivity probe technique with air as gas phase and water and 0.05%(mass),0.20% (mass)SCMC as liquid phases under a wide range of operating conditions. The axial and radial distributions of local phase holdups were studied under different operating conditions,liquid viscosity values and particle density values.1286 sets experimental data were obtained.Correlations of local solid holdup and gas holdup as a function of operating conditions and fluid physical properties as well as axial and radial distances were established respectively. The calculated local solid holdup and gas holdup distribution profiles were compared with those measured by the micro-conductivity probe technique. The correlations could describe well the distribution of local solid holdup and gas holdup observed experimentally.