Eulerian–Eulerian modeling is widely applied in simulations of multi-phase flows in fluidized beds. However, the validity of this model is questionable, especially with the limitation of gas–solid drag closures. In this study, CFD simulations were performed to investigate the validity of the numerical model for segregating fluidized bed. The numerical model was tested with experimental data from the literature to select the most appropriate gas–solid drag model. It was found that the Gidaspow drag model is generally better than the Syamlal–O’Brien, the BVK, and the Di Felice models. However, all the drag models showed poor agreement with experimental data of size segregating systems. Also, all the investigated gas–solid drag models mispredicted the minimum fluidization velocity of various fluidized bed systems. The Gidaspow and Di Felice models had an acceptable error, while the BVK and the SB always under-predicted the minimum fluidization velocity with high error. A new correlation was proposed to correct the computational superficial velocity to mitigate the effect of the error of fluidization velocity prediction by the Wen-Yu gas–solid drag model.

欧拉-欧拉模型广泛应用于流化床中多相流动的模拟。然而，这个模型的有效性是有问题的，特别是在气固阻力闭合的限制下。在这项研究中，进行了 CFD 模拟以研究用于隔离流化床的数值模型的有效性。用文献中的实验数据对数值模型进行测试，以选择最合适的气固阻力模型。发现 Gidaspow 阻力模型通常优于 Syamal-O'Brien、BVK 和 Di Felice 模型。然而，所有阻力模型与尺寸分离系统的实验数据显示出较差的一致性。此外，所有研究的气固阻力模型都错误地预测了各种流化床系统的最小流化速度。Gidaspow 和 Di Felice 模型具有可接受的误差，而 BVK 和 SB 总是以高误差低估最小流化速度。提出了一种新的相关性来校正计算表观速度，以减轻文宇气固阻力模型流化速度预测误差的影响。