(350h) Cluster Structure-Dependent Drag Model for Simulations of Gas-Solids Risers

A cluster structure-dependent (CSD) drag model is proposed to improve drag predictions for heterogeneous gas-solid flows in risers. A micro-meso-grid scales (M2GS) equation set consists of six hydrodynamic equations and one stability criteria with bivariate extreme value (BEV) theory as a function of eight independent variables and four dependent parameters on the basis of grid parameters. CSD drag model is verified by CFD simulations by coupling with the two-fluid model in a riser. The simulated results are compared with those using the Huilin-Gidaspow drag model and experimental data. Present investigations are supported by NSFC through Grant No. 51390494,51106039 and 51176042.