The present work deals with the computation of the gas–solid two-phase flow pressure drop across thin and thick orifices for a vertically downward flow configuration at the higher limits of a dilute phase flow situation $(0.01\le {\mathrm{\alpha }}_{\text{s},\text{in}}\le 0.10)$. The Eulerian–Eulerian (two-fluid) model has been used in conjunction with the kinetic theory of granular flow with a four-way coupling approach. The validation of the solution process has been performed by comparing the computational result with the existing experimental data. It is observed that the two-phase flow pressure drop across the orifice increases with an increase in the thickness of the orifice, and the effect is more prominent at higher solid loading. The pressure drop is found to increase with an increase in the solid volume fraction. An increase in the Reynolds number or the area ratio increases the pressure drop. An increase in the size of the particles reduces the pressure drop across the orifice at both small and relatively large solid volume fractions. Finally, a two-phase multiplier has been proposed in terms of the relevant parameters, which can be useful to evaluate the gas–solid two-phase flow pressure drop across the orifice and can subsequently help to improve the system performance.

目前的工作是在稀相流情况下，垂直向下流动时，薄壁和厚孔上的气固两相流压降的计算。 $（0.01\le {\mathrm{\alpha }}_{\text{s}，\text{在}}\le 0.10）$。欧拉-欧拉（两种流体）模型已与颗粒流动的动力学理论结合起来，并采用了四向耦合方法。解决方案过程的验证是通过将计算结果与现有实验数据进行比较来进行的。可以看出，随着孔口厚度的增加，流过孔口的两相流压降增加，并且在较高的固体载量下效果更加明显。发现压降随着固体体积分数的增加而增加。雷诺数或面积比的增加会增加压降。颗粒尺寸的增加减小了在较小和相对较大的固体体积分数时穿过孔的压降。最后，