Abstract To reduce the uncertainty in predicting pressure drop for two-phase flow through spherical particle beds, especially composed of small-sized particles that adversely affect the cooling, an experimental study was performed. A series of experiments were performed to measure the pressure drop of upward two-phase flow through well-packed spherical particle beds with 2, 3.5, and 5 mm diameter particles under isothermal conditions varying the gas flow rates with no water inflow at the bottom. Based on the experimental results and the results of our previous study related to the modification of Ergun constants, a new improved model for prediction of the two-phase flow pressure drop through porous media was proposed. The adequacy of the proposed model was verified by comparison with various existing experimental data for particle diameters of 3.18–6.35 mm and the superficial air velocity of 0–0.8 m/s.

中文翻译：

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单尺寸球形颗粒床两相流压降建模

摘要 为了减少预测通过球形颗粒床的两相流压降的不确定性，特别是由对冷却产生不利影响的小颗粒组成，进行了实验研究。进行了一系列实验来测量向上两相流通过具有 2、3.5 和 5 毫米直径颗粒的填充良好的球形颗粒床的压降，在等温条件下改变气体流速，底部没有水流入。基于实验结果和我们先前有关修改 Ergun 常数的研究结果，提出了一种新的改进模型，用于预测通过多孔介质的两相流压降。通过与粒径为 3 的各种现有实验数据进行比较，验证了所提出模型的充分性。