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首页> 外文期刊>Engineering Applications of Computational Fluid Mechanics >Development of an oscillation-based technology for the removal of colloidal particles from water CFD modeling and experiments
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Development of an oscillation-based technology for the removal of colloidal particles from water CFD modeling and experiments

机译：基于振荡的技术的开发，用于从水CFD建模和实验中去除胶体颗粒

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摘要

Colloidal particles removal from water is a challenge in surface water treatment. Previously, we suggested an original technique for colloidal particles separation from water based on physical flow manipulation by an oscillating device. Laboratory experiments and 2D numerical simulation indicated that this technology enhances colloidal particles grouping and enables their rapid, simultaneous aggregation and sedimentation. The 2D model used in that study was unable to fully elucidate the grouping mechanism, settling pattern, or particle trajectories. Here, we extended the numerical simulation from 2D to 3D and examined the system’s distinctive flow field. The flow field was solved with computational fluid dynamics (CFD) simulations in the commercial ANSYS Fluent code and validated by dye injection experiments. The sedimentation patterns could nicely be explained by the computational results. This explanation was strengthened by two-dimensional population balance model simulations, which showed that particles aggregated in two zones trailing the paddle edges. Additionally, the results indicate significantly higher TKE values and faster upward vertical velocities at the higher oscillating frequency, which explains the different sedimentation patterns and removal efficiencies generated by the different oscillation frequencies. The use of 3D numerical simulations will help to better understand and further optimize this novel technology.
机译：从水中去除胶体颗粒是表面水处理的挑战。以前，我们建议一种原始技术，用于基于振荡装置的物理流动操纵从水分离的胶体颗粒。实验室实验和2D数值模拟表明，该技术增强了胶体颗粒分组，使其快速，同时聚集和沉降。该研究中使用的2D模型无法完全阐明分组机制，沉降模式或粒子轨迹。在这里，我们将数值模拟扩展到2D到3D，并检查了系统的独特流场。在商业ANSYS流利的代码中，通过计算流体动力学（CFD）模拟来解决流场，并通过染料注射实验验证。可以通过计算结果来解释沉降模式。二维人口平衡模型模拟，这一解释得到了增强，这表明颗粒在落后的桨叶边缘的两个区域中聚集。另外，结果表明了更高的TKE值和更高的振荡频率的向上垂直速度，这解释了不同振荡频率产生的不同沉降模式和去除效率。 3D数值模拟的使用将有助于更好地理解并进一步优化这项新颖的技术。

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