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Title: Evaluation of wall boundary condition parameters for gas-solids fluidized bed simulations

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.
 [1] ;  [2]
  1. URS Corporation; Morgantown, WV (United States); National Energy Technology Lab. (NETL), Morgantown, WV (United States)
  2. National Energy Technology Lab. (NETL), Morgantown, WV (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0001-1541
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIChE Journal; Journal Volume: 59; Journal Issue: 10
American Institute of Chemical Engineers
Research Org:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
42 ENGINEERING Computational fluid dynamics, fludized bed, gas-solids flow, boundary condition, granular flow, two-fluid model