Numerical Analysis of Residence Time Distribution in Packed Bed Reactors with Irregular Particle Arrangements
Numerical Analysis of Residence Time Distribution in Packed Bed Reactors with Irregular Particle Arrangements
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DOI：
10.1515/cppm-2014-0021
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发表时间：
2015-03
影响因子：
0.9
通讯作者：
T. Atmakidis;E. Kenig
中科院分区：
文献类型：
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作者：
T. Atmakidis;E. Kenig
摘要 计算流体动力学方法适用于具有中等管径比的填充床反应器。为了在反应器内产生不规则的颗粒排列，使用了改进的弹道沉积方法。虽然我们之前的研究主要集中在压降和传质特性上，但本文使用相同的框架来研究此类反应器中发生的分散现象。应用两种不同的方法，即示踪剂和后处理方法。第一种方法模仿将非扩散示踪剂注入填充床的实验过程。停留时间可以根据示踪剂浓度的变化来评估。第二种方法是纯数值方法，可以快速估计停留时间。模拟结果已根据文献中的实验数据成功得到验证。建议的数值分析是一个有价值的工具，有助于更深入地了解此类反应器中的基本传输现象，从而改善填充床性能。
Abstract The computational fluid dynamics approach is applied to packed bed reactors with moderate tube-to-particle diameter ratios. In order to generate irregular particle arrangements within the reactors, a modified ballistic deposition method is used. While our previous studies were focused on pressure drop and mass transfer characteristics, the present paper uses the same framework to investigate the dispersion phenomena occurring in such reactors. Two different methods, namely the tracer and the post-processing method, are applied. The first method imitates the experimental procedure in which a non-diffusive tracer is injected into the packed bed. The residence time can be evaluated from the evolution of the tracer concentration. The second method is purely numerical and allows fast residence time estimation. Simulation results are successfully validated against experimental data from literature. The suggested numerical analysis is a valuable tool toward a deeper understanding of the fundamental transport phenomena in such reactors and, consequently, for the improvement of the packed bed performance.