在线阅读

在线阅读

Partic. vol. 34 pp. 70-80 (October 2017)
doi: 10.1016/j.partic.2016.12.003

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

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chenjuhui@hit.edu.cnshuaiwang@hit.edu.cn

Highlights

    • The SGS-TKE model under the framework of LES-SOM approach was derived. • The anisotropic characteristics of particles in the circulating fluidized bed were predicted. • The second-order moment of particles and the SGS turbulent kinetic energy of gas were analyzed. • The effects of solid mass flux on the anisotropic characteristics of particles were summarized.

Abstract

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.

Graphical abstract

Keywords

Large-eddy simulation; Sub-grid scale turbulent kinetic energy model; Second-order moment model; Anisotropic gas–solid flow; Circulating fluidized bed