This work pursues the closure for the effective reaction rate based on fine‐grid two‐fluid model (TFM) simulations in reactive gas‐solid flows. It is found that the mesoscale mechanism in the solid‐catalyzed reaction is constrained by the kinetic regime (KR) and the external mass transfer‐controlled regimes (EMTR). Thus, a filtered reaction rate model ηsubgrid considered two different regimes is proposed. The mesoscale effectiveness factor proposed in previous work is adopted in KR. A filtered interphase mass transfer model QM, which is constructed by analogy to the interphase heat transfer model, is used in EMTR. ηsubgrid shows a good predictability in two regimes via a priori test. The fidelity of ηsubgrid is also assessed via a filtered TFM simulation. The results indicate that the simulations incorporating corrections for the drag force and reaction rate yield better agreement with the fine‐grid simulations for both mass fraction and reaction rate profiles.

中文翻译：

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反应气固流中的过滤反应速率和相间传质模型


这项工作基于反应气固流中的细网格双流体模型（TFM）模拟，寻求有效反应速率的闭合。研究发现，固体催化反应的介观机制受到动力学机制（KR）和外部传质控制机制（EMTR）的约束。因此，提出了考虑两种不同状态的过滤反应速率模型 ηsubgrid。 KR 采用了前人工作中提出的中尺度有效性因子。 EMTR 中使用了通过类比相间传热模型构建的过滤相间传质模型 QM。通过先验测试，ηsubgrid 在两种情况下显示出良好的可预测性。 ηsubgrid 的保真度也通过滤波 TFM 模拟进行评估。结果表明，结合阻力和反应速率修正的模拟与质量分数和反应速率曲线的细网格模拟更加一致。