Assessment of gas-particle flow models for pseudo-2D fluidized bed applications

VENIER, CESAR M.; MARQUEZ DAMIAN, SANTIAGO; NIGRO, NORBERTO M.

CHEMICAL ENGINEERING COMMUNICATIONS

TAYLOR & FRANCIS INC

Año: 2018 vol. 205 p. 456 - 478

0098-6445

The aim of this work is to provide more insight into the general modeling criteria for simulatingpseudo-2D bubbling fluidized beds. For this purpose, two experimental-based problems are stud-ied. First, a fluidized bed with a high-speed central jet problem is analyzed. A qualitative study ofthe first bubble indicates that the bubble shape prediction is highly sensitive to the frictional modeladopted. The most accurate results in terms of bubble shape and detachment time are given bySrivastava-Sundaresan model. Second, a uniformly fluidized bed problem in bubbling regime isconsidered. For this case, the drag models and boundary conditions for the particulate phase areinvestigated. Time-averaged solid phase velocity profiles are compared with the results of the liter-ature where it is found that no-slip conditions (or partial slip with a high specularity coefficient) aremore appropriate than slip conditions at the walls for these regimes. Also, the Di Felice drag modelproduces accurate results for a moderate fluidization regime, but the Syamlal-O?Brian drag modelis more robust for predicting the solid phase hydrodynamics for different gas inlet conditions.