Effect of solid mass flux on anisotropic gas–solid flow in risers determined with an LES-SOM model
Juhui Chena, b, *, Cheng Menga, Shuai Wangc, *, Guangbin Yua, Ting Hub, Feng Linb
Within the framework of the two-fluid approach, gas was treated with a large-eddy simulation and a sub-grid-scale (SGS) turbulent kinetic energy model while particles were treated with a second-order-moment method to describe the anisotropy of the fluctuating velocity. A modified Simonin model was derived for the gas–solid interphase fluctuating energy transfer. The anisotropic gas–solid flow in a circulating fluidized bed was investigated. Predictions were in good agreement with experimental data. The distributions of the second-order moment of particles and SGS-turbulent kinetic energy of gas were simulated at different solid mass fluxes. The effects of the solid mass flux on the particle second-order moment, particle anisotropic behavior, gas SGS-turbulent kinetic energy and gas SGS energy dissipation were analyzed for the circulating fluidized bed.
Large-eddy simulation; Sub-grid scale turbulent kinetic energy model; Second-order moment model; Anisotropic gas–solid flow; Circulating fluidized bed