Quartet structure generation set (QSGS) method is improved to numerically reconstruct three-dimensional heterogeneous porous wicks with uniform pore size distribution. The capillary pumping processes of the reconstructed random porous wicks are simulated at pore scale by using a three-dimensional two-phase lattice Boltzmann model. The evolutions of two-phase interface and the variations of the imbibed liquid volume fraction with time are analyzed under the conditions of different porosity, pore structure, and surface wettability. The comparisons between the LBM results and those predicted by a macroscopic scale homogenous model are also conducted. It is found that due to the pore scale effects, the two-phase interface in a random porous media is very irregular, especially at the earlier stages of capillary pumping process when the liquid penetration is faster, and the imbibed liquid does not increase exponentially with time as predicted by the macroscopic scale model. Meanwhile, the liquid penetration rate does not decrease monotonously, but exhibits different degrees of fluctuations. The pore scale effects are more prominent in the cases of lower porosity, smaller pore size and better surface wettability. In the parametric range of the present study, the capillary performance increases with the decreasing of porosity, average pore radius (when porosity is fixed) and contact angle.

改进了四重结构生成集 (QSGS) 方法以数值重建具有均匀孔径分布的三维异质多孔芯。通过使用三维两相晶格 Boltzmann 模型，在孔隙尺度上模拟了重建的随机多孔芯的毛细管泵送过程。分析了不同孔隙率、孔隙结构和表面润湿性条件下两相界面的演变和吸液体积分数随时间的变化。还进行了 LBM 结果与宏观尺度同质模型预测的结果之间的比较。发现由于孔隙尺度效应，随机多孔介质中的两相界面非常不规则，特别是在毛细管泵送过程的早期阶段，当液体渗透较快时，吸收的液体不会像宏观模型预测的那样随时间呈指数增长。同时，液体渗透率也不是单调下降，而是呈现不同程度的波动。在孔隙率较低、孔径较小和表面润湿性较好的情况下，孔隙尺度效应更为突出。在本研究的参数范围内，毛细管性能随着孔隙率、平均孔隙半径（当孔隙率固定时）和接触角的减小而增加。但表现出不同程度的波动。在孔隙率较低、孔径较小和表面润湿性较好的情况下，孔隙尺度效应更为突出。在本研究的参数范围内，毛细管性能随着孔隙率、平均孔隙半径（当孔隙率固定时）和接触角的减小而增加。但表现出不同程度的波动。在孔隙率较低、孔径较小和表面润湿性较好的情况下，孔隙尺度效应更为突出。在本研究的参数范围内，毛细管性能随着孔隙率、平均孔隙半径（当孔隙率固定时）和接触角的减小而增加。