The liquid bridge is an important model problem in printing processes. We report the experimental results of stretching a highly viscous liquid bridge between two parallel plates. Depending on the stretching speed, a thin liquid bridge exhibits two representative flow regimes. At low stretching speeds, the liquid bridge deforms in a quasi-static manner and no liquid films are observed. When the stretching speed exceeds a critical value, the contact line fails to follow the retracting meniscus, resulting in the deposition of liquid films on the plate. The entrained film is characterized by an annular rim that retracts and grows by collecting the liquid in the film. It is found that the velocity of the receding contact line is weakly decreasing, and the growth of the rim is characterized by a width of wrim∼Ca1/3t1/2, where the capillary number Ca is defined by the stretching velocity and t is the time. The film may not be fully absorbed into the bulk of the liquid bridge before its eventual breakup at high stretching speeds, leading to variations in the liquid transfer ratio of the two plates.

中文翻译：

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拉伸液桥的动态润湿转变

液桥是印刷过程中的一个重要模型问题。我们报告了在两个平行板之间拉伸高粘性液桥的实验结果。根据拉伸速度，薄液桥表现出两种代表性的流动状态。在低拉伸速度下，液桥以准静态方式变形，并且没有观察到液膜。当拉伸速度超过临界值时，接触线无法遵循缩回的弯液面，导致液膜沉积在板上。夹带薄膜的特点是有一个环形边缘，该边缘通过收集薄膜中的液体而收缩和增长。研究发现，后退接触线的速度呈微弱减小，边缘的生长特征为wrim∼Ca1/3t1/2的宽度，其中毛细管数Ca由拉伸速度定义，t为拉伸速度。时间。薄膜在高拉伸速度下最终破裂之前可能无法完全吸收到液桥的主体中，从而导致两个板的液体转移比发生变化。