Experimental and numerical study of fluidization and pressure drop of spherical and non-spherical particles in a model scale fluidized bed
Experimental and numerical study of fluidization and pressure drop of spherical and non-spherical particles in a model scale fluidized bed
复制标题
模型尺度流化床中球形与非球形颗粒流化及压降的实验与数值研究
DOI：
10.1016/j.powtec.2015.11.045
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发表时间：
2016-04-01
影响因子：
5.2
通讯作者：
Kruggel-Emden, H.
中科院分区：
文献类型：
--
作者：
Vollmari, K.;Jasevicius, R.;Kruggel-Emden, H.
实验室规模的流化床进行了实验和数值研究，涉及不同尺寸的木制Geldart-D颗粒形状。采用耦合DEM-CFD方法进行模拟，该方法涉及实现颗粒形状和取向的拖曳力模型。为了验证曳力模型，并了解更多的非球形颗粒的流化行为的压降，颗粒高度和取向分布进行了分析。为了从实验中获得可比较的数据，开发了PTV-MATLAB脚本来检测颗粒并确定它们的方向和高度。实验和数值计算结果是在大多数颗粒类型的良好协议，在压降的差异可以分配到不匹配的颗粒高度或取向。颗粒高度分布的差异是由于颗粒堆积在角落或靠近容器壁。结果发现，尽管有这些局部偏差，DEM-CFD可以准确地再现细长颗粒的取向行为，随着速度的增加，细长颗粒与流动对齐。对于低于一定伸长率的细长颗粒，不能观察到这种行为，这通过实验和模拟两者来证实。(C)2015年由Elsevier B. V.出版
A laboratory scale fluidized bed was examined experimentally and numerically involving differently sized wooden Geldart-D particle shapes. Simulations were performed with a coupled DEM-CFD approach, which involves a drag force model that realizes for the particle shape and orientation. To validate the drag force model and to learn more about the fluidization behavior of non-spherical particles the pressure drop, particle height and orientation distributions were analyzed. To gain comparable data from the experiments, a PTV-MATLAB script was developed to detect particles and determine their orientations and heights. Experimental and numerical results are in good agreement for most particle types; differences in the pressure drop can be allocated to mismatching particle heights or orientations. Differences in the particle height distribution are a result of particles that stack up in corners or close to the vessel walls. It was found that despite these local deviations the DEM-CFD can accurately reproduce the orientation behavior of elongated particles, which with increasing velocity align themselves with the flow. For elongated particles below a certain elongation ratio this behavior could not be observed, which was confirmed by both experiments and simulations. (C) 2015 Published by Elsevier B.V.