Evaluation of wall boundary condition parameters for gas-solids fluidized bed simulations
- URS Corporation; Morgantown, WV (United States); National Energy Technology Lab. (NETL), Morgantown, WV (United States)
- National Energy Technology Lab. (NETL), Morgantown, WV (United States)
Wall boundary conditions for the solids phase have significant effects on numerical predictions of various gas-solids fluidized beds. Several models for the granular flow wall boundary condition are available in the open literature for numerical modeling of gas-solids flow. In this study, a model for specularity coefficient used in Johnson and Jackson boundary conditions by Li and Benyahia (AIChE Journal, 2012, 58, 2058-2068) is implemented in the open-source CFD code-MFIX. The variable specularity coefficient model provides a physical way to calculate the specularity coefficient needed by the partial-slip boundary conditions for the solids phase. Through a series of 2-D numerical simulations of bubbling fluidized bed and circulating fluidized bed riser, the model predicts qualitatively consistent trends to the previous studies. Furthermore, a quantitative comparison is conducted between numerical results of variable and constant specularity coefficients to investigate the effect of spatial and temporal variations in specularity coefficient.
- Research Organization:
- National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- DOE Contract Number:
- FE0004000
- OSTI ID:
- 1127096
- Report Number(s):
- CONTR-PUB-023
- Journal Information:
- AIChE Journal, Vol. 59, Issue 10; ISSN 0001-1541
- Publisher:
- American Institute of Chemical Engineers
- Country of Publication:
- United States
- Language:
- English
Similar Records
MFIX simulation of NETL/PSRI challenge problem of circulating fluidized bed
MULTIFLUID EULERIAN MODELLING OF DENSE GAS-SOLID FLUIDIZED BED HYDRODYNAMICS: INFLUENCE OF THE DISSIPATION PARAMETERS