Packed bed microreactors offer a promising platform for intensifying heterogeneously catalyzed reactions. To understand hydrodynamics therein, N2 or water flow was investigated experimentally through microreactors packed with glass beads in this work, corresponding to a microreactor to particle diameter ratio (D/d) of 1.29–25.12. The porosity of a single pellet string microreactor (D/d < 1.866) agrees with the literature's theoretical equation. For microreactors with larger D/d ratios, an empirical porosity correlation is proposed to address the dense packing nature of the bed. The existing correlations are inadequate to describe the pressure drop data in microreactors within the entire D/d ratios and modified Reynolds numbers (Rem < 291). At D/d ≥ 3, the measured pressure drop is described by the modified Ergun equation using properties of the bulk bed zone to exclude the wall effect. At D/d < 3, it can be predicted by introducing a correction term for the wall effect into the Ergun equation.

中文翻译：

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填充床微反应器单相流下压降特性的实验研究


填充床微反应器为强化非均相催化反应提供了一个有前途的平台。为了了解其中的流体动力学，在这项工作中，通过填充有玻璃珠的微反应器对 N2 或水流进行了实验研究，对应于 1.29-25.12 的微反应器与粒径比 （D/d）。单颗粒串微反应器的孔隙率 （D/d < 1.866） 与文献的理论方程一致。对于具有较大 D/d 比的微反应器，提出了经验孔隙率相关性来解决床层的致密堆积性质。现有的相关性不足以描述整个 D/d 比和修正雷诺数 （Rem < 291） 内微反应器中的压降数据。在 D/d ≥ 3 时，测得的压降由修正的 Ergun 方程描述，该方程使用堆积床区的属性来排除壁效应。在 D/d < 3 处，可以通过在 Ergun 方程中引入壁效应的校正项来预测。