A numerical study on gas-fluidized beds of wet flexible fibers

A numerical study on gas-fluidized beds of wet flexible fibers
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湿柔性纤维气体流化床的数值研究

DOI:
10.1016/j.powtec.2021.117094
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发表时间:
2021-12
期刊:
影响因子:
5.2
通讯作者:
Yu Guo
Yu Guo
中科院分区:
工程技术2区
文献类型:
--
作者:
Lixiang Zhong;D;an Xu;Yiyang Jiang;Yu Guo

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采用离散单元法(DEM)和计算流体力学(CFD)相结合的方法,对含少量液体的湿式柔性纤维气态床进行了数值模拟。建立了液桥力模型,考虑了湿纤维间形成液桥所产生的粘结接触力。考察了初始床层高度、粘结度(用键数表征)和纤维柔韧性对流态化特性(压降、床层平均高度、固体混合速率和团簇尺寸)的影响。研究发现,凝聚力和纤维柔度通过影响初始床层高度和床层孔隙率来影响压降和最小流态化速度。与压力降和平均床层高度相比,混合速率对粘聚力和纤维柔韧性的变化更为敏感。
Gas-fluidized beds of wet flexible fibers with small amounts of liquid are investigated using a coupled approach.of Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD). A liquid-bridge force model is implemented.to account for cohesive contact forces due to formation of liquid bridges among the wet fibers. The.effects of initial bed height, degree of cohesion (characterized by a bond number), and fiber flexibility have.been examined on fluidization characteristics (pressure drop, average height of fluidized bed, solids mixing.rate, and cluster size). It is found that the cohesion and fiber flexibility have impacts on the pressure drop and.minimum fluidization velocity by affecting initial bed height and bed porosity. Compared to pressure drop and.average height of fluidized bed, the mixing rate is more sensitive to changes in the cohesion and fiber flexibility..This work aims to contribute to a better understanding of wet fiber fluidization.
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