In this work, the CFD-DEM method is applied to establish a spouted pulsed fluidized bed (SPFB) model, which can enhance the heat and mass transfer by eliminating the dead zones. The effects of the frequency and amplitude of the auxiliary pulsed flow on the gas–solid flow, particle mixing, and heat transfer characteristics as well as the mutual correlation analysis are investigated. The results show that the mixing rate and average Lacey index of bidispersed particles first increase and then decrease with the increase of pulsed flow frequency or amplitude. Based on the comprehensive analysis of flow and heat transfer characteristics, it is determined that the optimal pulse flow condition is frequency 6 Hz and amplitude 1.2 m/s. The convection heat transfer and radiation heat transfer rates increased by 4.8% and 9.2%, respectively, compared with that under continuous flow. The results can provide effective theoretical guidance for the design and optimization of the SPFB.

中文翻译：

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喷口脉冲流化床中双分散颗粒的流动行为与传热特性的 CFD-DEM 建模及相关性分析


本工作应用 CFD-DEM 方法建立了喷口脉冲流化床 （SPFB） 模型，该模型可以通过消除死区来增强传热传质。研究了辅助脉冲流的频率和振幅对气固流、颗粒混合和传热特性的影响，并进行了互相关分析。结果表明，随着脉冲流频率或振幅的增加，双分散颗粒的混合速率和平均Lacey指数先增加后减小。基于流动和传热特性的综合分析，确定最佳脉冲流条件为频率 6 Hz，振幅 1.2 m/s。与连续流相比，对流传热和辐射传热速率分别提高了 4.8% 和 9.2%。研究结果可为SPFB的设计和优化提供有效的理论指导。