We numerically investigate the effect of liquid cohesion on the clogging of microchannels induced by small wet particles. The computer simulation is performed by the discrete element method (DEM) with cohesive contact models in presence of pendular liquid bridges, which is embedded into the computational fluid dynamics (CFD). We find that liquid cohesion significantly promotes particle deposition and agglomerate growth. A clogging phase diagram, in the form of Weber number and Stokes number, is constructed to quantify the clogging-nonclogging transition. The competition between particle–particle and particle–fluid interactions is quantitatively discussed in terms of particle velocity and slip velocity. Strong cohesion can address a greater slip velocity or drag between particles and fluid, which depresses the resuspension of deposited particles and results in clogging. Finally, we compare our results with clogging induced by van der Waals adhesion of small dry particles and find that the competence of liquid cohesion is more prominent.

中文翻译：

---

具有液体凝聚力的小颗粒堵塞微通道的机理

我们数值研究了液体内聚力对小湿颗粒引起的微通道堵塞的影响。计算机模拟是通过离散元方法 (DEM) 与内聚接触模型在存在摆动液桥的情况下执行的，该模型嵌入到计算流体动力学 (CFD) 中。我们发现液体内聚力显着促进颗粒沉积和团聚体生长。以韦伯数和斯托克斯数的形式构建堵塞相图来量化堵塞-非堵塞转变。粒子-粒子和粒子-流体相互作用之间的竞争在粒子速度和滑移速度方面进行了定量讨论。强内聚力可以解决更大的滑移速度或阻力颗粒和流体之间，这会抑制沉积颗粒的再悬浮并导致堵塞。最后，我们将我们的结果与小干颗粒的范德华粘附引起的堵塞进行了比较，发现液体内聚能力更为​​突出。