Coarse grid simulation of bed expansion characteristics of industrial-scale gas–solid bubbling fluidized beds
Coarse grid simulation of bed expansion characteristics of industrial-scale gas–solid bubbling fluidized beds
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DOI：
10.1016/j.ces.2009.12.004
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发表时间：
2010-03
影响因子：
4.7
通讯作者：
Junwu Wang;van der M.A. Hoef;J. Kuipers
中科院分区：
文献类型：
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作者：
Junwu Wang;van der M.A. Hoef;J. Kuipers
工业规模气体流化床流体动力学的双流体建模证明了工程师和科学家长期面临的挑战。在这项研究中，我们提出了一种简单的方法来修改当前可用的阻力相关性，以允许未解决的子网格尺度结构的影响，假设每个计算单元内的粒子以两相结构的形式呈现。因此，该方法可以用粗计算网格模拟工业规模的Geldart B和D颗粒鼓泡流化床的流体动力学。结果表明，通过对阻力关系式的修正，可以在可接受的计算成本下合理地预测工业规模鼓泡流化床的床层膨胀特性。模拟结果与实验数据有较好的一致性。
Two-fluid modeling of the hydrodynamics of industrial-scale gas-fluidized beds proves a long-standing challenge for both engineers and scientists. In this study, we suggest a simple method to modify currently available drag correlations to allow for the effect of unresolved sub-grid scale structures, by assuming that the particles inside each computational cell are presented in the form of a two-phase structure. This method would thus make it possible to simulate the hydrodynamics of industrial-scale bubbling fluidized beds of Geldart B and D particles with a coarse computational mesh. It is shown that with the proposed modification of the drag force correlation, the experimentally measured bed expansion characteristics of industrial-scale bubbling fluidized beds can be reasonably predicted at acceptable computational cost. Also the simulation result for the macroscopic solid circulation pattern is in qualitative agreement with the experimental data.