Computational modeling of gas/particle flow in a riser

✍ Scribed by Arild Samuelsberg; Bjørn H. Hjertager

• Publisher: American Institute of Chemical Engineers
• Year: 1996
• Tongue: English
• Weight: 946 KB
• Volume: 42
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690420605

✦ Synopsis

Axial solid velocity, solid volume fraction, and solid shear viscosity were computed in the riser of a circulating puidized-bed reactor using a two-phase 2-0 computational fluid dynamic model. The time-averaged model predictions agree well with the experimental data of Miller and Gidaspow (1992). The model predicts a core-annulus flow in the riser, similar to that found experimentally. The maximum velocity in the core agrees well with the measurements, but the downflow in the annulus is somewhat ovelpredicted. The solid volume fractions profiles agree well in both core and annulus, with discrepancy in the core at the level close to the inlet The radial profile of solid shear viscosity computed by the turbulent kinetic energy model is ten times lower in the core than that found experimentally, but with a linear function of solid volume fraction in the measurement, the computed profile agrees well with experiments.