This article investigated the fluidization of sands and small Geldart A biomass mixtures. The mixture fluidized like Geldart A type particles with a uniform bed expansion regime before bubbling. The video recorded color distance between pure sands and sands–biomass mixtures was used to estimate the sands–biomass mixing. The coarse‐grained computational fluid dynamics–discrete element method with a hybrid drag model which couples the Syamlal–O'Brien drag and a filtered drag can capture the mixing while the simulation with Gidaspow drag predicted a segregated bed. The simulations were further validated with experimental measured pressure drops. The time averaged pressure drop equals the weight of the bed material, however, its fluctuation is about three times of the bed material fluctuation.

中文翻译：

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砂和Geldart A生物质共流化的实验和数值研究

本文研究了沙子和小型Geldart A生物质混合物的流化过程。在鼓泡之前，混合物像Geldart A型颗粒一样流化，并具有均匀的床膨胀方式。视频记录的纯砂与砂-生物质混合物之间的色差用于估计砂-生物质混合。带有Syamlal–O'Brien阻力和过滤阻力的混合阻力模型的粗粒计算流体动力学离散元方法可以捕获混合，而Gidaspow阻力的模拟则预测了分离床。通过实验测得的压降进一步验证了仿真。时间平均压降等于床材料的重量，但是，其波动约为床材料波动的三倍。