A Comparative Study on Fluidization Characteristics of Coarse and Fine Particles in a Gas - Solid Fluidized Bed: CFD Analysis
A Comparative Study on Fluidization Characteristics of Coarse and Fine Particles in a Gas - Solid Fluidized Bed: CFD Analysis
复制标题
气固流化床粗细颗粒流化特性对比研究：CFD分析
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Sahoo
中科院分区：
文献类型：
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作者：
P. Sahoo;A. Sahoo
对二维气固两相流态化的粗颗粒和细颗粒的流体力学进行了实验和计算研究。通过实验观察了床层动力学，即床层压降、床层在流态化过程中达到的最小高度和最大高度。并利用商用CFD软件FLUENT 13.0进行了CFD模拟。模型参数采用Gidaspow阻力模型、颗粒恢复系数0.9值、0.001收敛准则和一阶离散格式。对实验结果和CFD模拟结果进行了对比，分析了床层高度和压降的变化规律。比较表明，模拟结果与实验结果非常接近。实验结果表明，该模型能够较好地反映床层内的气固两相流动特征。
Hydrodynamics of a two - dimensional gas - solid fluidized bed are studied experimentally and computationally for coarse and fine particles. The experiments are carried out to observe the bed dynamics namely pressure drop across the bed, the minimum and maximum heights of the expanded bed which are attained during the fluidization process. CFD simulation is also carried out by using commercial CFD software package, Fluent 13.0. The model parameters such as Gidaspow drag model, 0.9 value of restitution coefficient of particles, 0.001 convergence criterion, and first-order discretization schemes has been used. The experimental and CFD simulated results are compared with each other for pressure drop variations and bed height changes. The comparison shows a close approximation between the simulated and experimental results. It is observed that the proposed model is able to capture the gas - solid flow features existing within the fluidized bed.