Particle-resolved simulation of flow and hydrodynamic behavior of different shape particles in fixed bed reactor

IF 3.6 2区工程技术 Q1 MECHANICS

International Journal of Multiphase Flow Pub Date : 2025-03-23 DOI:10.1016/j.ijmultiphaseflow.2025.105226

Mukhtiar Ahmed , Yang Yang , Xiaoxing Liu

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Abstract

This study investigates the hydrodynamic behavior of fluid-particle interactions in fixed bed assemblies containing particles of various shapes, including spheres, cylinders, and trilobes. Using sequential rigid body dynamics (RBD) for particle-resolved computational fluid dynamics (PRCFD) simulations, we analysed local flow structures in random packings of these particles. The simulations were efficiently conducted for systems containing 120 to 700 particles. We also examined the influence of the tube-to-particle diameter ratio (N) to understand the wall effects on packing and flow structure. Our analyses of porosity, flow behavior, and pressure drop align well with established empirical correlations. The results indicated that local structural configurations significantly affect velocity distribution at the particle level. The RBD-CFD method employed in this study proves to be a robust and reliable tool for obtaining detailed insights into particle-level hydrodynamics in fixed bed reactors with both spherical and non-spherical particles.

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固定床反应器中不同形状颗粒流动及流体动力特性的颗粒分解模拟

本研究探讨了固定床中流体-颗粒相互作用的流体动力学行为，固定床中包含各种形状的颗粒，包括球体、圆柱体和三叶状颗粒。利用序列刚体动力学（RBD）进行颗粒分辨计算流体动力学（PRCFD）模拟，我们分析了这些颗粒随机填料中的局部流动结构。对包含120 ~ 700个粒子的系统进行了有效的模拟。我们还研究了管与颗粒直径比(N)的影响，以了解壁面对填料和流动结构的影响。我们对孔隙度、流动特性和压降的分析与已建立的经验相关性非常吻合。结果表明，局部结构构型对粒子水平上的速度分布有显著影响。本研究中采用的RBD-CFD方法被证明是一种稳健可靠的工具，可以详细了解具有球形和非球形颗粒的固定床反应器的颗粒级流体动力学。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Multiphase Flow 物理-力学

CiteScore

7.30

自引率

10.50%

发文量

244

审稿时长

4 months

期刊介绍： The International Journal of Multiphase Flow publishes analytical, numerical and experimental articles of lasting interest. The scope of the journal includes all aspects of mass, momentum and energy exchange phenomena among different phases such as occur in disperse flows, gas–liquid and liquid–liquid flows, flows in porous media, boiling, granular flows and others. The journal publishes full papers, brief communications and conference announcements.