论文标题
快速粘弹性扩散
Rapid Viscoelastic Spreading
论文作者
论文摘要
我们研究了粘弹性滴在固体上的快速扩散动力学。接触后，表面张力沿基材驱动接触线的快速运动。在这里，我们通过对不同浓度的水性聚合物溶液进行实验来解决粘弹性液体的运动。发现虽然接触线运动仅受聚合物的轻度影响，但由于奇异的聚合物应力，界面曲线变得更加清晰。这种行为让人联想到粘弹性下降合并所观察到的行为。在这种情况下，我们重新审视了扩散与结合之间的类比，这也为牛顿液体的扩散提供了新的光。
We investigate the rapid spreading dynamics of a viscoelastic drop on a solid. Upon contact, surface tension drives a fast motion of the contact line along the substrate. Here, we resolve this motion for viscoelastic liquids by experiments on aqueous polymer solutions of varying concentration. It is found that while the contact line motion is only mildly affected by the polymers, the interface profile becomes much sharper owing to singular polymer stress. This behaviour is reminiscent of that observed for viscoelastic drop coalescence; in this light we revisit the analogy between spreading and coalescence, which sheds new light also on the spreading of Newtonian liquids.
