LBM-DEM data for the infiltration characteristics of slurries in porous media

Based on the DEM-LBM coupled method, we built a simplified model to simulate the process of slurry infiltrating porous media. The simulation result indicated that the fine particles had stronger movement performance than large particles. Thus, larger particles generally stopped in the porous media surface and formed a filter cake mixture with the later fine particles. Whereas, fine particles composed blockage inside the porous media. In addition, the applied fluid pressure had a close relationship with the slurry infiltration. On the one hand, higher pressure could promote slurry to infiltrate porous media. On the other hand, the pressure could also make the media clog faster by the slurry. There was a pressure threshold to make the slurry infiltrate rapidly without immediate blockage. To further investigate the media clogging process of this simulation, we classified the blockage in the media as single clogging, connecting clogging, and retention clogging according to the mechanical stability and particle composition. At the same time, we also provided a detailed description to explain the clogging process during the slurry infiltration.

本研究基于离散元法-格子玻尔兹曼法（DEM-LBM）耦合方法，构建简化模型以模拟浆液渗入多孔介质的过程。仿真结果表明，细颗粒的运动性能优于大颗粒：大颗粒通常会停留在多孔介质表面，并与后续侵入的细颗粒共同形成滤饼混合物；而细颗粒则会在多孔介质内部形成堵塞。此外，施加的流体压力与浆液渗流过程密切相关：一方面，更高的流体压力可促进浆液渗入多孔介质；另一方面，过高的压力也会加速多孔介质被浆液堵塞。存在临界压力阈值，可使浆液快速渗流且不会立即发生堵塞。为进一步探究该仿真中的多孔介质堵塞过程，本研究依据力学稳定性与颗粒组成，将介质内部的堵塞分为单一堵塞、连通堵塞与滞留堵塞三类；同时，本研究还对浆液渗流过程中的堵塞机理进行了详细阐释。