Study on the anisotropy of particle fluctuation in a jet bubbling bed

IF 2.3 3区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Granular Matter Pub Date : 2024-01-09 DOI:10.1007/s10035-023-01388-x

Xi Chen, Shuyan Wang, Baoli Shao, Lei Xie, Guangjun Kuang, Yimei Ma

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Abstract

The flow behavior of particles is simulated with an Eulerian-Eulerian two-fluid model based on kinetic theory of granular flow (KTGF) in a jet bubbling bed. A second-order moment (SOM) model is applied to explore the anisotropy flow behavior of particles through kinetic interaction of particle collisions. The particle frictional stresses are calculated using equations proposed by Johnson and Jackson (J Fluid Mech 176:67–93, 1987) and Schaeffer (J Differ Eq 66:9–50, 1987). The predictions of the equivalent bubble diameter and porosity are in good agreement with experimental data by Kuipers et al. Simulated comparisons between the KTGF model and the SOM model show that the SOM model is superior to the KTGF model in capturing the inhomogeneity and anisotropy of the flow field. The simulated results demonstrate that the axial second-order moment component is significantly larger than the radial second-order moment component, and they exhibit obvious anisotropy. Finally, the impacts of jet velocity, particle diameter, and restitution coefficient on the second-order moments are analyzed, respectively. It is found that the enhancement of jet velocity and particle diameter intensifies the anisotropy of flow structure, and a higher restitution coefficient weakens the anisotropy due to the reduction of energy dissipation.

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喷射鼓泡床中颗粒波动的各向异性研究

基于颗粒流动力学理论（KTGF）的欧拉-欧拉双流体模型模拟了喷射鼓泡床中颗粒的流动行为。应用二阶矩（SOM）模型，通过颗粒碰撞的动力学相互作用来探索颗粒的各向异性流动行为。粒子摩擦应力采用 Johnson 和 Jackson（J Fluid Mech 176：67-93，1987 年）以及 Schaeffer（J Differ Eq 66：9-50，1987 年）提出的公式计算。对等效气泡直径和孔隙率的预测与 Kuipers 等人的实验数据十分吻合。KTGF 模型与 SOM 模型的模拟比较表明，SOM 模型在捕捉流场的不均匀性和各向异性方面优于 KTGF 模型。模拟结果表明，轴向二阶力矩分量明显大于径向二阶力矩分量，并表现出明显的各向异性。最后，分别分析了射流速度、颗粒直径和回复系数对二阶力矩的影响。结果发现，射流速度和颗粒直径的增大加剧了流动结构的各向异性，而较高的回复系数则由于能量耗散的减少而削弱了各向异性。

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来源期刊

Granular Matter Materials Science-General Materials Science

CiteScore

4.60

自引率

8.30%

发文量

审稿时长

6 months

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.