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化工学报  2014 

鼓泡床床层高度的细网格DEM模拟

DOI: 10.3969/j.issn.0438-1157.2014.06.020, PP. 2092-2097

Keywords: 流化床,多相流,模拟,DEM,曳力,细网格

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Abstract:

气固流化床DEM的细网格模拟中,采用传统方法计算网格空隙率和局部空隙率会对模拟结果造成较大偏差,给出一个精确面积分数模型和一个完全依赖颗粒环境的局部空隙率模型,从而更加合理地计算网格空隙率和局部空隙率。采用二倍颗粒直径的细网格模拟了小规模鼓泡流化床,模拟的气泡形状和尺寸与实验结果接近。模拟结果表明:采用给出的面积分数模型和局部空隙率模型能较好地模拟鼓泡流化床床层高度随时间变化的波形。

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