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Insight into particle detachment in clogging of porous media; a pore scale study using lattice Boltzmann method
Advances in Water Resources ( IF 4.7 ) Pub Date : 2021-03-14 , DOI: 10.1016/j.advwatres.2021.103888
Amin Parvan , Saeed Jafari , Mohammad Rahnama , Saeid Norouzi-Apourvari , Amir Raoof

Clogging of porous media is controlled by attachment of particles and their subsequent detachment. In this study, we explore particle transport at the pore scale by considering attachment and detachment processes. We use pore structures of three samples which have similar topological properties but different initial porosities. The main focus is on particle detachment, after they are attached to the solid grain boundaries, and to explore how particle detachment affects hydraulic properties and clogging of porous media. A new approach was proposed by combining the lattice Boltzmann method with a Lagrangian method to simulate fluid flow and particle transport, respectively. Comparisons between several simulations, with and without detachment, were used to evaluate the impact of particle detachment on fluid flow velocity distributions. The coefficients of Carman-Kozeny relation were used to relate porosity changes of each sample to its permeability alterations. Additionally, the influence of the initial porosity of the sample and flow velocity on the detachment process was analysed. The results show that compared to the impact of flow velocity, the initial porosity of the media has a greater influence on controlling the rate of detachment and change of pore structures.



中文翻译:

洞察多孔介质堵塞中的颗粒分离;晶格玻尔兹曼法的孔尺度研究

多孔介质的堵塞是通过颗粒的附着及其随后的分离来控制的。在这项研究中,我们通过考虑附着和分离过程来探索在孔隙尺度上的颗粒运输。我们使用三个具有相似拓扑特性但初始孔隙率不同的样品的孔结构。在将它们附着到固体颗粒边界之后,主要重点是颗粒分离,并探讨颗粒分离如何影响水硬性和多孔介质的堵塞。通过将格子玻尔兹曼方法与拉格朗日方法相结合,分别模拟流体流动和颗粒传输,提出了一种新方法。在有和没有分离的情况下,进行了几种模拟之间的比较,以评估颗粒分离对流体流速分布的影响。Carman-Kozeny关系系数用于将每个样品的孔隙率变化与其渗透率变化相关联。另外,分析了样品初始孔隙率和流速对分离过程的影响。结果表明,与流速的影响相比,介质的初始孔隙度对控制孔隙结构的脱离速率和变化的影响更大。

更新日期:2021-03-27
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