An experimental study of pressure drop characteristics under single-phase flow through packed bed microreactors

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL AIChE Journal Pub Date : 2024-11-20 DOI:10.1002/aic.18640

Lu Zhang, Arne Hommes, Remon Schuring, Jun Yue

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Abstract

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 (Re_m < 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.

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填料床微反应器中单相流压降特性的实验研究

填料床微反应器为强化异构催化反应提供了一个前景广阔的平台。为了了解其中的流体力学，本研究通过实验研究了氮气或水在微反应器中的流动情况，微反应器与颗粒的直径比（D/d）为 1.29-25.12。单颗粒串微反应器的孔隙率（D/d <1.866）与文献中的理论方程一致。对于 D/d 比值较大的微反应器，建议采用经验孔隙率相关性来解决床层的致密堆积特性。在整个 D/d 比和修正雷诺数（Rem < 291）范围内，现有的相关性不足以描述微反应器中的压降数据。当 D/d ≥ 3 时，测得的压降由修正的厄尔贡方程描述，该方程使用了大量床层区域的特性来排除壁面效应。在 D/d < 3 时，可以通过在厄尔贡方程中引入壁面效应修正项来预测压降。

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

期刊介绍： The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering. The AIChE Journal is indeed the global communications vehicle for the world-renowned researchers to exchange top-notch research findings with one another. Subscribing to the AIChE Journal is like having immediate access to nine topical journals in the field. Articles are categorized according to the following topical areas: Biomolecular Engineering, Bioengineering, Biochemicals, Biofuels, and Food Inorganic Materials: Synthesis and Processing Particle Technology and Fluidization Process Systems Engineering Reaction Engineering, Kinetics and Catalysis Separations: Materials, Devices and Processes Soft Materials: Synthesis, Processing and Products Thermodynamics and Molecular-Scale Phenomena Transport Phenomena and Fluid Mechanics.