Effect of wall boundary condition on CFD simulation of CFB risers

- Hydrodynamics of gas-solid flow in a CFB riser were simulated using two-fluid model.
- Gidaspow- and EMMS-based drag models and different wall boundary conditions were used.
- Effect of wall boundary condition on hydrodynamics of CFB was closely related to drag model used.
- Small specularity resulted in better agreement with experiments while using EMMS-based drag model.