During gas–solid mixture conveying in a dense phase, material is conveyed in dunes on the bottom of the pipeline, or as a pulsating moving bed. This phenomenon increases the pressure drop and power consumption. We introduce a new technique to reduce the pressure drop, which is termed the perforated double tube. To validate this new model, the gas–solid flow pattern and pressure drop were studied numerically and experimentally. The power consumption was also studied experimentally. Numerical studies were performed by the Eulerian–Lagrangian approach to predict gas and particle movement in the pipeline. Comparisons between the numerical predictions and the experimental results for the gas–solid flow patterns and pressure drop show good agreement.

在气固混合物以密相传输的过程中，物料以沙丘形式在管道底部或以脉动移动床的形式进行传输。这种现象会增加压降和功耗。我们引入了一种新技术来减少压降，该技术被称为带孔双管。为了验证该新模型，对气体-固体流动模式和压降进行了数值和实验研究。还对功耗进行了实验研究。通过欧拉-拉格朗日方法进行了数值研究，以预测管道中的气体和颗粒运动。气固两相流模式和压降的数值预测与实验结果之间的比较显示出很好的一致性。