一种在低管粒直径比充填床中定义流体动力学单元的系统方法

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2024-12-26 DOI:10.1002/aic.18707

Dalia N. Dorantes-Landa, Alberto Hernandez-Aguirre, Luis Ricardez-Sandoval, Sergio Huerta-Ochoa, Carlos O. Castillo-Araiza

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引用次数: 0

摘要

这项工作开发了一种方法，通过描述颗粒雷诺数在5到100之间的径向空隙率和速度分布，确定合适的代表性体积（单位细胞），以捕获dt/dp≤10的球体或圆柱体填充床的流体动力学。采用刚体模拟来构建合成填料，而速度剖面则通过颗粒分解模拟获得。该方法基于不同长度层之间流体动力学的相似性，确定了单元格准确描述孔隙率和速度剖面所需的最小长度（或层中颗粒的数量）。定义这样的流体动力学单元不仅减少了计算量，而且为其在多尺度技术中的应用开辟了道路，以开发可靠的伪连续模型，这是目前工业场景中壁冷填充床反应器设计和优化的瓶颈。

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A systematic approach to defining a unit cell for fluid dynamics in packed beds with low tube-to-particle diameter ratio

This work develops an approach to identify the suitable representative volume (unit cell) that captures fluid dynamics in beds packed with spheres or cylinders with a d_t/d_p ≤ 10, by describing radial void fraction and velocity profiles at particle Reynolds numbers between 5 and 100. Rigid-body simulations were used to construct synthetic packings, while velocity profiles were obtained from particle-resolved simulations. This methodology, rooted in the similitude of fluid dynamics between beds of different lengths, determines the minimum length (or number of particles in a bed) required for the unit cell to accurately describe the void fraction and velocity profiles. Defining such a unit cell for fluid dynamics not only reduces computational effort but also opens avenues for its use in multiscale techniques to develop reliable pseudo-continuous models, which is currently the bottleneck in the design and optimization of wall-cooled packed-bed reactors in industrial scenarios.

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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.