A computational study based on the Euler–Lagrange approach was developed for the characterization of flammable dusts in the 20 L sphere standard test. The aim of the study was to analyze some parameters that might affect the experimental data (e.g., cold turbulence and particle size). The turbulence of a wheat starch cloud was described with the Detached Eddy Simulation model. Both the pressure of the system and the RMS velocity were compared with the flow patterns established with a particle image velocimetry analysis. It was concluded that the rebound nozzle forms a cloud that is composed by clumps. This fact implies dissimilarities between the local concentrations and the nominal value. Finally, a granulometric analysis established that the mean diameter of the particle size distribution (PSD) decreased by 69% during the dispersion. Thus, it is suggested to consider the PSD at the ignition zone rather than the PSD of the sample. © 2017 American Institute of Chemical Engineers AIChE J, 2017

中文翻译：

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CFD作为了解易燃粉尘20 L标准测试的一种方法：点火时间对流体流量的影响

进行了基于欧拉-拉格朗日方法的计算研究，以表征20 L球形标准测试中的可燃粉尘。该研究的目的是分析一些可能影响实验数据的参数（例如，冷湍流和粒径）。用Dedched Eddy Simulation模型描述了小麦淀粉云的湍流。系统的压力和RMS速度都与通过颗粒图像测速分析建立的流动模式进行了比较。结论是回弹喷嘴形成了由团块组成的云。这一事实暗示了局部浓度和标称值之间的差异。最终，粒度分析确定了分散过程中粒径分布（PSD）的平均直径降低了69％。因此，建议考虑在点火区的PSD，而不是样品的PSD。©2017美国化学工程师学会AIChE的Ĵ，2017年