Drinking water distribution systems are prone to (bio)fouling over time, negatively impacting drinking water quality. Ice slurry pigging is a promising technology used to remove solids attached to the inner parts of the pipe walls with ice-water mixture. To understand the ice slurry pigging flow characteristics and optimize its operations, this study presents the development of a Computational Fluid Dynamics model (CFD) combined with the Kinetic Theory of Granular Flow model (KTGF) and a thermal model. Firstly, the model is validated with experimental data from the literature on solid-liquid Two-Phase Flow (TPF), including flow characteristics and thermal effects. Secondly, simulations for a typical ice slurry pigging process show uneven ice phase fraction and shear stress distributions in the main pipe flow and vertical direction. Results indicate that the main limitations of effective pipe cleaning are due to buoyancy and thermal effects. Moreover, ice slurry with 1.0 mm ice particles performs better in providing effective shear stress compared to 0.1 mm, 0.5 mm, and 1.5 mm ice particles. Additionally, the optimal injection ratios of ice slurry with 1.0 mm are determined to be over 0.3 and 0.26 when cleaning pipeline lengths within 500 m and 1000 m, respectively.

中文翻译：

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饮用水分配系统中的冰浆清管技术：从流动机构到管道清洁应用


随着时间的推移，饮用水分配系统容易出现（生物）污垢，对饮用水质量产生负面影响。冰浆清管是一项很有前途的技术，用于去除附着在管壁内部的冰水混合物中的固体。为了了解冰浆清管流特性并优化其操作，本研究提出了计算流体动力学模型 （CFD） 的开发，该模型结合了颗粒流动力学理论模型 （KTGF） 和热模型。首先，利用文献中关于固液两相流 （TPF） 的实验数据对模型进行了验证，包括流动特性和热效应;其次，对典型冰浆清管过程的模拟表明，在主管流和垂直方向上存在不均匀的冰相分数和剪切应力分布。结果表明，有效管道清洁的主要限制是由于浮力和热效应。此外，与 0.1 mm、0.5 mm 和 1.5 mm 冰粒相比，具有 1.0 mm 冰粒的冰浆在提供有效剪切应力方面表现更好。此外，当清洗管道长度在 500 m 和 1000 m 以内时，1.0 mm 冰浆的最佳注入率分别超过 0.3 和 0.26。