Abstract In a slurry pipeline, the diverging sections are an important pipe fitting and also a cause of major pressure loss and sometimes flow separation. To address this potential issue, the complex solid-liquid flow of coal water slurry through conical diverging sections is simulated using the computational fluid dynamics approach. Nine different geometries of the diverging sections are analyzed in the present study. The length of the diverging section is the key variable in the geometric variations and ranges from 0.05 m to 0.6 m. The influx velocity at the entrance of all the diverging sections is varied in the range of 0.5 m/s to 5 m/s. The mass concentration of the solids dispersed inside the liquid phase is varied from 10 to 60%. The results generated by the computational fluid dynamics tool are in good agreement with the experimental data. The design of the diverging section is evaluated based on results obtained for three characterization parameters viz. pressure recovery coefficient, head-loss across the diverging section and volumetric efficiency. The 0.3 m long diverging section is found to be the optimum design for best pressure recovery, maximum volumetric efficiency and lowest head-loss.

中文翻译：

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使用计算流体动力学方法模拟锥形分流段内的固液流动

摘要 在泥浆管道中，分流段是重要的管件，也是造成重大压力损失和流动分离的原因。为了解决这个潜在问题，使用计算流体动力学方法模拟了通过锥形发散部分的水煤浆的复杂固液流动。本研究分析了九种不同几何形状的发散部分。发散段的长度是几何变化中的关键变量，范围从 0.05 m 到 0.6 m。所有分流段入口处的流入速度在 0.5 m/s 到 5 m/s 的范围内变化。分散在液相中的固体的质量浓度从 10% 到 60% 不等。计算流体动力学工具生成的结果与实验数据非常吻合。发散部分的设计基于三个特征参数获得的结果进行评估，即。压力恢复系数、扩散段的水头损失和容积效率。发现 0.3 m 长的分流段是实现最佳压力恢复、最大容积效率和最低水头损失的最佳设计。