Characterization and CFD-DEM modelling of a prismatic spouted bed
Characterization and CFD-DEM modelling of a prismatic spouted bed
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DOI：
10.1016/j.powtec.2014.05.026
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发表时间：
2015-01-01
影响因子：
5.2
通讯作者：
Kuipers, J. A. M.
中科院分区：
文献类型：
--
作者：
Salikov, Vitalij;Antonyuk, Sergiy;Kuipers, J. A. M.
在这项研究中，棱柱形喷动床的特点是实验和建模的三维CFD离散元模拟。主要研究了气体流量对床层动力学和喷动稳定性的影响。在不同的气体速度下获得的压降时间序列被用于识别流态的频域和混沌特性，如关联维数和Kolmogorov熵。气体和颗粒动力学进行了研究，通过模拟不同的操作制度：喷射开始，以及稳定和不稳定的制度。发现了矩形槽床的典型三维床层行为，颗粒流动模式、床层膨胀和特征气体压力波动动力学的模拟与实验之间取得了良好的一致性。研究了整个床层的颗粒动力学随气速的变化规律。对于一个稳定的制度，床区域显示不同的颗粒动力学（喷口，喷泉和环）的详细特征。还提供了示出依赖于入口与床尺寸比和气体速度的稳定操作窗口的状态图。(C)2014爱思唯尔有限公司版权所有。
In this study a prismatic spouted bed was characterized experimentally and modelled by means of 3D CFD-DEM simulations. The main focus was on the investigation of the influence of the gas flow rate on the bed dynamics and spouting stability. Pressure drop time series obtained at different gas velocities were used for the identification of flow regimes by means of the frequency domain and of chaotic properties such as the correlation dimension and Kolmogorov entropy. The gas and particle dynamics were investigated through simulations of different operational regimes: the spouting onset, as well as stable and instable regimes. A 3-D bed behaviour, typical for slot-rectangular beds, was found. A good agreement between simulations and experiments in the particle flow patterns, bed expansion and dynamics of characteristic gas pressure fluctuations was achieved. The particle dynamics as a function of the gas velocity was investigated for the entire bed. For one of the stable regimes, the bed regions showing different particle dynamics (spout, fountain and annulus) were characterized in detail. A regime map showing the stable operational window in dependence on an inlet-to-bed size ratio and gas velocity is also provided. (C) 2014 Elsevier B.V. All rights reserved.