标题： 非牛顿泥浆在水平渠道中固体沉降的数值研究 显示英文标题

标题： Numerical investigation on solids settling in a non-Newtonian slurry inside a horizontal flume

摘要： 浆液输送对于许多工业过程始终是关键的。 本研究数值研究了非牛顿浆液中多尺寸固体颗粒在半圆形开放渠道（水槽）中的沉降行为。 非牛顿浆液使用三维（3D）非定常欧拉-欧拉（E-E）模型与赫谢尔-巴克利（HB）流变模型相结合进行模拟。 对曳力模型进行了详细的敏感性分析，以建立浆液流中的固液相互作用。 数值模型通过文献中的实验数据进行了验证，并显示出良好的一致性。 经过验证的模型用于模拟水槽中浆液的沉降行为。 浆液中固体颗粒的平均粒径范围为75-296 $\mu$m，中位直径为188 $\mu$m。 在参数研究中，研究了颗粒尺寸分布（PSDs）、水槽倾斜度、气泡尺寸和气泡体积分数对水槽内颗粒沉降的影响。 我们的结果分析表明，固体的沉降在开放通道系统中显著受到PSDs的影响。 特别是，水槽倾斜度的增加分别促进了细颗粒和粗颗粒的沉降和消散。 额外的模拟显示，气泡的出现影响了固体的沉降速度，这改变了多尺寸固体在水槽内的沉降行为。 所提出的研究可以作为优化浓缩浆液中水分中间排除的有价值指南，以确保尾矿储存设施的稳定性。 显示英文摘要

摘要： Slurry transportation is always crucial for many industrial processes. This study numerically investigates the settling behavior of multisize solid particles in a non-newtonian slurry inside a semicircular open channel (flume). The non-newtonian slurry is modelled using a three-dimensional (3D) unsteady Eulerian-Eulerian (E-E) model coupled with the Hershel-Bulkley (HB) rheological model. A detailed sensitivity analysis of drag models is performed to establish the solid-fluid interaction in the slurry flow. The numerical model is validated with the experimental data from the literature and shows a fair agreement. The validated model is used to simulate the settling behavior of the slurry in the flume. The mean particle diameter of the solid particles in the slurry is in the range of 75-296 $\mu$m with a median diameter of 188 $\mu$m. The effect of particle size distributions (PSDs), flume inclination, bubble size and bubble volume fraction on the particle settling inside the flume is investigated in the parametric study. The analysis of our results revealed that the settling of solids is significantly affected by PSDs in the open channel system. In particular, the increase in flume inclination progresses the settling and dissipation of fine and coarse particles, respectively. Additional simulations showed that the inception of bubbles influences the settling velocity of solids, which changes the settling behavior of multisize solids inside the flume. The presented study can be used as a valuable guideline for the optimisation of intermediate exclusion of water from thickened slurry in order to ensure the stability of tailing storage facility.