Xi Chen, Shuyan Wang, Baoli Shao, Lei Xie, Guangjun Kuang, Yimei Ma
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Study on the anisotropy of particle fluctuation in a jet bubbling bed
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.
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.
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