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arXiv 2201.03932physics.flu-dyncs.NAmath.NA
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使用OpenFOAM的20 L容器中湍流粉尘扩散的CFD模拟

CFD simulations of turbulent dust dispersion in the 20 L vessel using OpenFOAM

Alain Islas, Andrés Rodróguez Fernández, Covadonga Betegón, Emilio Martínez-Pañeda, Adrián Pandal

摘要:

粉尘爆炸是影响处理颗粒固体的工业设施的最危险的事故之一。描述粉尘云的严重性参数是粉尘爆炸安全管理和风险评估的关键。根据ASTM E1226或UNE 14034标准,在20 L球形容器中通过实验确定这些参数。由于它们的再现性取决于与尘埃云相关的湍流水平,因此使用多相(气-固)流的计算模型来模拟具有开源CFD代码OpenFOAM的分散过程。该模型成功地验证了从文献和商业CFD代码的数值结果的实验测量。此外,本研究考虑了颗粒尺寸对载相湍流的影响,表明颗粒衰减了其湍流强度。此外,该模型很好地预测了双涡流型的形成,这对d<=100 μ m的含颗粒流的分布有负面影响,因为大多数颗粒集中在近壁区域。相反,对于供给较大颗粒(d=200 μ m)的情况,观察到改善的尘埃云均匀性,因为这些颗粒的增加的惯性允许它们进入再循环区域。

英文摘要:

Dust explosions are among the most hazardous accidents affecting industrial facilities processing particulate solids. Describing the severity parameters of dust clouds is critical to the safety management and risk assessment of dust explosions. These parameters are determined experimentally in a 20L spherical vessel, following the ASTM E1226 or UNE 14034 standards. Since their reproducibility depends on the levels of turbulence associated with the dust cloud, a computational model of the multi-phase (gas-solid) flow is used to simulate the dispersion process with the open-source CFD code OpenFOAM. The model is successfully validated against experimental measurements from the literature and numerical results of a commercial CFD code. In addition, this study considers the impact of particle size on the turbulence of the carrier phase, suggesting that particles attenuate its turbulence intensity. Moreover, the model predicts well the formation of a two-vortex flow pattern, which has a negative impact on the distribution of the particle-laden flows with d<=100 um, as most of the particles concentrate at the near-wall region. Contrarily, an improved homogeneity of dust cloud is observed for a case fed with larger particles (d=200 um), as the increased inertia of these particles allows them to enter into the re-circulation regions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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