In this study, we investigated the effect mechanism of the grain material of artificial porous media coating quartz sand (SiO), titanium dioxide (n-TiO), zinc oxide (ZnO) and polystyrene (PS) on the motion and deposition of suspended particles. First, the relationship was deeply analysed between the DLVO potential energy and the physico-chemical properties of grain material, including the Hamaker constant and surface zeta potential. Second, the lattice Boltzmann method-immersed moving boundary-discrete element method (LBM-IMB-DEM) was used to investigate the motion characteristics of suspended particles and their effects, including the penetration rate, deposition rate, porosity reduction and the porosity-permeability relations. Third, the relations were innovatively explained between the energy barrier and the particles bridging and bridge collapse which cause the fluctuation of permeability reduction. The main results are as follows. (1) The descending order of the energy barrier between suspended particle and grain material is SiO, ZnO, PS and n-TiO, which is the same as that of the surface zeta potential of grain material. (2) For the suspended particles with the same size, the higher potential energy and Primary energy minimum (PEM) enhance the penetration rate. The particle deposition rate in porous media coating n-TiO is higher than others. (3) The highest non-uniformity of the porosity reduction occurs in the porous media coating the material with the lowest energy barrier. (4) For the grain material with lower energy barrier, the fluctuation frequency of permeability reduction is lower owing to the longer bridging time.

中文翻译：

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人工多孔介质颗粒物质对悬浮颗粒运动和沉积影响的孔隙尺度模拟


本研究研究了人工多孔介质涂层石英砂（SiO）、二氧化钛（n-TiO）、氧化锌（ZnO）和聚苯乙烯（PS）颗粒材料对悬浮颗粒运动和沉积的影响机制。 。首先，深入分析了DLVO势能与颗粒材料物理化学性质（包括Hamaker常数和表面zeta电位）之间的关系。其次，采用格子玻尔兹曼法-浸入式移动边界-离散元法（LBM-IMB-DEM）研究了悬浮颗粒的运动特性及其影响，包括渗透速率、沉积速率、孔隙度降低和孔隙渗透率等。关系。第三，创新性地解释了能量势垒与引起渗透率降低波动的颗粒架桥和桥塌之间的关系。主要结果如下。 (1) 悬浮颗粒与颗粒物质之间的能垒由大到小依次为SiO、ZnO、PS、n-TiO，与颗粒物质表面zeta电位相同。 (2)对于相同尺寸的悬浮颗粒，较高的势能和初级能量最小值(PEM)提高了穿透率。多孔介质涂层 n-TiO 中的颗粒沉积率高于其他介质。 (3) 孔隙率降低的最高不均匀性发生在涂覆具有最低能垒的材料的多孔介质中。 (4)对于能垒较低的颗粒材料，由于桥接时间较长，渗透率降低的波动频率较低。