A numerical study of fluidization behavior of Geldart A particles using a discrete particle model
A numerical study of fluidization behavior of Geldart A particles using a discrete particle model
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DOI：
10.1016/j.powtec.2003.10.012
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发表时间：
2004-01
影响因子：
5.2
通讯作者：
M. Ye;van der M.A. Hoef;J. Kuipers
中科院分区：
文献类型：
--
作者：
M. Ye;van der M.A. Hoef;J. Kuipers
本文报告了使用二维软球离散颗粒模型 (DPM) 对 Geldart A 颗粒流化行为进行的数值研究。如果粒子间范德华力相对较弱，则可以清楚地显示一些典型特征，包括均匀膨胀、无气泡时的总粒子循环以及快速气泡。在均匀流化状态和鼓泡状态中都发现颗粒速度波动的各向异性。均匀流化被证明代表由三种基本相互作用的竞争产生的过渡相：流体-颗粒相互作用、颗粒-颗粒碰撞（和颗粒-壁碰撞）和颗粒间范德华力。然而，在鼓泡状态下，颗粒间范德华力的影响消失，流体-颗粒相互作用成为决定 Geldart A 颗粒流化行为的主导因素。颗粒物压力与其他理论和实验结果的比较也证明了这一点。
This paper reports on a numerical study of fluidization behavior of Geldart A particles by use of a 2D soft-sphere discrete particle model (DPM). Some typical features, including the homogeneous expansion, gross particle circulation in the absence of bubbles, and fast bubbles, can be clearly displayed if the interparticle van der Waals forces are relatively weak. An anisotropy of the velocity fluctuation of particles is found in both the homogeneous fluidization regime and the bubbling regime. The homogeneous fluidization is shown to represent a transition phase resulting from the competition of three kinds of basic interactions: the fluid–particle interaction, the particle–particle collisions (and particle–wall collisions) and the interparticle van der Waals forces. In the bubbling regime, however, the effect of the interparticle van der Waals forces vanishes and the fluid–particle interaction becomes the dominant factor determining the fluidization behavior of Geldart A particles. This is also evidenced by the comparisons of the particulate pressure with other theoretical and experimental results.