论文标题
固体颗粒之间的毛细血管桥力：晶格玻尔兹曼模拟的见解
Capillary-bridge Forces Between Solid Particles: Insights from Lattice Boltzmann Simulations
论文作者
论文摘要
固体颗粒之间的液体毛细血管形成对颗粒材料的流变特性有关键影响，尤其是对流化床反应器的效率。可用的分析和半分析方法具有固有的局限性，通常不涵盖重要方面，例如存在非轴对称桥梁。在这里，我们使用晶格玻尔兹曼方法对毛细管桥形成的毛细管桥形成的数值模拟，并评估了不同分析模型家族的准确性。我们发现，某些模型显示出比其他模型更好。但是，所有这些都无法预测大于$π/2 $的接触角的毛细管力，在这种毛细角度上，排斥力的毛细管力试图向外推着固体粒子以最大程度地减少表面能量，尤其是在较小的分离距离处。
Liquid capillary-bridge formation between solid particles has a critical influence on the rheological properties of granular materials and, in particular, on the efficiency of fluidized bed reactors. The available analytical and semi-analytical methods have inherent limitations, and often do not cover important aspects, like the presence of non-axisymmetric bridges. Here, we conduct numerical simulations of the capillary bridge formation between equally and unequally-sized solid particles using the lattice Boltzmann method, and provide an assessment of the accuracy of different families of analytical models. We find that some of the models taken into account are shown to perform better than others. However, all of them fail to predict the capillary force for contact angles larger than $π/2$, where a repulsive capillary force attempts to push the solid particle outwards to minimize the surface energy, especially at a small separation distance.
