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Title: An approach for drag correction based on the local heterogeneity for gas-solid flows

The drag models typically used for gas-solids interaction are mainly developed based on homogeneous systems of flow passing fixed particle assembly. It has been shown that the heterogeneous structures, i.e., clusters and bubbles in fluidized beds, need to be resolved to account for their effect in the numerical simulations. Since the heterogeneity is essentially captured through the local concentration gradient in the computational cells, this study proposes a simple approach to account for the non-uniformity of solids spatial distribution inside a computational cell and its effect on the interaction between gas and solid phases. Finally, to validate this approach, the predicted drag coefficient has been compared to the results from direct numerical simulations. In addition, the need to account for this type of heterogeneity is discussed for a periodic riser flow simulation with highly resolved numerical grids and the impact of the proposed correction for drag is demonstrated.
ORCiD logo [1] ;  [2] ;  [3] ;  [2] ;  [2]
  1. National Energy Technology Lab. (NETL), Morgantown, WV (United States); AECOM, Morgantown, WV (United States)
  2. Chinese Academy of Sciences (CAS), Beijing (China). State Key Lab. of Multiphase Complex Systems, Inst. of Process Engineering
  3. National Energy Technology Lab. (NETL), Morgantown, WV (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 0001-1541
Grant/Contract Number:
Accepted Manuscript
Journal Name:
AIChE Journal
Additional Journal Information:
Journal Volume: 63; Journal Issue: 4; Journal ID: ISSN 0001-1541
American Institute of Chemical Engineers
Research Org:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
Sponsoring Org:
Country of Publication:
United States
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; computational fluid dynamics; gas–solid flow; drag model; direct numerical simulation; heterogeneous structure; sub-grid model
OSTI Identifier: