Two-phase flow behavior in the freeboard of a gas-fluidized bed

✍ Scribed by F. Hamdullahpur; G. D. M. MacKay

• Publisher: American Institute of Chemical Engineers
• Year: 1986
• Tongue: English
• Weight: 703 KB
• Volume: 32
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690321215

✦ Synopsis

An experimental and theoretical study was conducted to identify the flow behavior of gas and particulates in the freeboard of a gas-fluidized bed. The axial velocity and turbulence intensity distributions were measured along the centerline and across the freeboard. A laser Doppler velocimeter (LDV) was used for the experiments. A technique based on fluorescence emission was developed t o discriminate between gasphase and particle-phase velocity information. The gas phase measurements revealed a strong influence of bubble induced turbulence on gas velocity distribution. The axial particle velocity indicated a two-stage decay with height. Models were developed to predict centerline gas velocity and transport disengagement height.