Liquid bridges have attracted great interest for many years in wide areas, including wet granular process, mineral processing, and flow in particle-formed porous media. Research to date has explored the liquid bridge force and rupture distance between surfaces of various shapes. However, the rupture of a large liquid bridge between rough surfaces is a problem of practical importance. This work investigated the rupture distance and shape of the liquid bridge formed between surfaces with different roughnesses, as well as the redistribution of the liquid after rupture. Firstly, some experiments on smooth surfaces were performed and a Volume of Fluid (VOF) model was established to provide a fundamental base for simulation of the liquid bridge behaviours on rough surfaces. This model was calibrated by the rupture experimental results and then applied to predict the effect of roughness on the liquid bridge rupture distance. The effect of contact angle and roughness on the rupture distance, shape and redistribution of the liquid bridge has been further analysed. It was shown that the roughness of the surfaces plays a significant role in rupture distance, particularly for relatively large roughness values.

多年来，液桥在广泛的领域引起了极大的兴趣，包括湿法颗粒工艺，矿物加工以及颗粒状多孔介质中的流动。迄今为止的研究已经探索了各种形状的表面之间的液桥力和破裂距离。然而，在粗糙表面之间的大的液桥的破裂是具有实际重要性的问题。这项工作研究了在具有不同粗糙度的表面之间形成的液桥的破裂距离和形状，以及破裂后液体的重新分布。首先，在光滑表面上进行了一些实验，建立了流体体积（VOF）模型，为模拟粗糙表面上的液桥行为提供了基础。该模型通过断裂实验结果进行了校准，然后用于预测粗糙度对液桥断裂距离的影响。进一步分析了接触角和粗糙度对液桥断裂距离，形状和再分布的影响。结果表明，表面的粗糙度在断裂距离中起着重要的作用，特别是对于较大的粗糙度值。