流化床中碳纳米管聚集体流体力学的 CPFD 模拟

IF 2.9 4区 工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY Korean Journal of Chemical Engineering Pub Date : 2024-08-19 DOI:10.1007/s11814-024-00257-4
Suyoung Kim, Min Ji Lee, Ye Ji Chang, Yujin Go, Geunhye Won, Sung Won Kim
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引用次数: 0

摘要

建立了含有碳纳米管(CNT,dp = 485 μm)颗粒的流化床反应器的粒子流体动力学(CPFD)计算模型。确定了阻力模型和系数,以模拟流化床中碳纳米管的流体动力学行为。阻力系数反映了 CNT 团聚造成的物理性质变化,如团聚体尺寸分布、颗粒圆度和表观密度。根据固体滞留分布的结果,选择了阻力系数为 0.17 的 Richardson-Davidson-Harrison 模型。所提出的 CPFD 模型描述了床层膨胀、固体截留分布和压降相对标准偏差(RSD)随气体速度变化的流体力学行为,并预测了部分流化和完全流化状态之间的过渡气体速度。在部分流化体系中,床层膨胀率和 RSD 随气体速度的增加而逐渐增大,在完全流化体系开始时迅速增大。气体速度的增加极大地增强了床层膨胀和颗粒夹带,从而形成了大的 CNT 聚集体,并在完全流化体系的自由板中形成了更高的固体截留。模拟结果描述了床面附近和自由板区域的 CNT 聚集体的行为,支持了之前的文献研究结果。床层和自由板区域出现了不均匀的局部气体流,模拟结果描述了完全流态化条件下的气泡床特性。
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A CPFD Simulation on Hydrodynamics of Carbon Nanotube Aggregates in a Fluidized Bed

A computational particle–fluid dynamics (CPFD) model of a fluidized bed reactor with carbon nanotube (CNT, dp = 485 μm) particles was established. A drag model and coefficient were determined to simulate the hydrodynamic behavior of CNTs in a fluidized bed. The drag coefficient reflected the variation in physical properties owing to CNT agglomeration, such as aggregate size distribution, particle circularity, and apparent density. The Richardson–Davidson–Harrison model with a drag coefficient of 0.17 was chosen based on results on solid holdup distribution. The proposed CPFD model described hydrodynamic behaviors, such as bed expansion, solid holdup distribution, and relative standard deviation (RSD) of the pressure drop with gas velocity, and predicted the transition gas velocity between the partial and complete fluidization regimes. The bed expansion and RSD gradually increased with increasing gas velocity in the partial fluidization regime and rapidly increased at the beginning of the complete fluidization regime. The increased gas velocity significantly enhanced bed expansion and particle entrainment, resulting in the formation of large CNT aggregates and a higher solid holdup in the freeboard in the complete fluidization regime. The simulated results describe the behavior of CNT aggregates near the bed surface and in the freeboard region, supporting previous findings in the literature. Uneven local gas flows occurred in the bed and freeboard regions, and the results described the bubbling bed characteristics in the complete fluidization regime.

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来源期刊
Korean Journal of Chemical Engineering
Korean Journal of Chemical Engineering 工程技术-工程:化工
CiteScore
4.60
自引率
11.10%
发文量
310
审稿时长
4.7 months
期刊介绍: The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.
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