This study investigates the pressure drop in horizontal pipes packed with large particles that result in small pipe-to-particle diameter ratio both experimentally and numerically. Two horizontal pipes of 0.1905 and 0.0254 m ID filled with cylindrical or spherical particles are used to collect the experimental data for single and two-phase flows. The porosity has same value for both pipes when they packed with cylindrical particles which is 0.75, however has different values when packed with spherical particles, 0.7 for the large pipe and 0.57 for the small pipe. The Roe-type Riemann solver proposed by Santim and Rosa Int J Numer Methods Fluids 80 (9), 536–568, [36] which uses the Drift-Flux model is modified aiming to predict the pressure drop in porous media through the implementation of a new source term in the system of equations. Empirical models available in the literature are used to calculate the single and two-phase flows pressure drop. The motivation is to verify the solver capability to reproduce the two-phase flow pressure drop in porous media and to compare some empirical models existing in the literature against the experimental data provided modifying some empirical coefficients when necessary.

这项研究调查了在水平方向上装有大颗粒的管道中的压降，无论是在实验上还是在数值上，该压降都会导致小管道与颗粒直径之比降低。使用两个填充有圆柱形或球形颗粒的0.1905和0.0254 m ID的水平管收集单相和两相流的实验数据。当两个管子装满圆柱形颗粒时，其孔隙率值相同，为0.75；但是，当装满球形颗粒时，其孔隙率值不同；大管子的孔隙率为0.7，小管子的孔隙率为0.57。Santim和Rosa Int J Numer Methods提出的Roe型Riemann求解器对使用Drift-Flux模型的Fluids 80（9），536–568，[36]进行了修改，目的是通过实施方程系统中的一个新的源项。文献中可用的经验模型用于计算单相和两相流压降。这样做的目的是验证求解器在多孔介质中再现两相流压降的能力，并将文献中现有的一些经验模型与实验数据进行比较，并在必要时提供修改某些经验系数的实验数据。