Abstract The paper presents validation of a mathematical model describing the friction factor by comparing the predicted and measured results in a broad range of solid concentrations and mean particle diameters. Three different types of solids, surrounded by water as a carrier liquid, namely Canasphere, PVC, and Sand were used with solids density from 1045 to 2650 kg/m3, and in the range of solid concentrations by volume from 0.10 to 0.45. All solid particles were narrowly sized with mean particle diameters between 1.5 and 3.4 mm. It is presented that the model predicts the friction factor fairly well. The paper demonstrates that solid particle diameter plays a crucial role for the friction factor in a vertical slurry flow with coarse solid particles. The mathematical model is discussed in reference to damping of turbulence in such flows. As the friction factor is below the friction for water it is concluded that it is possible that the effect of damping of turbulence is included in the KB function, which depends on the Reynolds number.

中文翻译：

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含粗颗粒的垂直泥浆流中摩擦系数预测的验证

摘要 本文通过比较广泛的固体浓度和平均粒径范围内的预测和测量结果，对描述摩擦系数的数学模型进行了验证。三种不同类型的固体，被水包围作为载液，即 Canasphere、PVC 和沙子，固体密度为 1045 至 2650 kg/m3，固体体积浓度范围为 0.10 至 0.45。所有固体颗粒的尺寸都很窄，平均粒径在 1.5 到 3.4 毫米之间。结果表明，该模型较好地预测了摩擦系数。该论文表明，固体颗粒直径对具有粗固体颗粒的垂直浆料流中的摩擦系数起着至关重要的作用。数学模型是参考这种流动中的湍流阻尼来讨论的。