论文标题

弹性会影响液滴合并

Elasticity can affect droplet coalescence

论文作者

Varma, Sarath Chandra, Dasgupta, Debayan, Kumar, Aloke

论文摘要

最近对固体基材上聚合物液滴合并的研究报告了强烈的分歧。问题的核心是聚合物滴的合并是否类似于牛顿液的液体,并且与分子松弛无关,或者聚合链纠缠的作用是否导致与牛顿液不同的过渡动力学。通过本报告,我们通过讨论合并方法对管理聚结的主要力的影响(即惯性,耗散和放松)的影响来解决分歧。我们的研究揭示了聚合物滴的聚合动力学不是通用的,实际上,它取决于触发聚结的方法。此外,我们通过相似性分析在不同时间瞬间演示桥梁的空间特征。从理论上讲,我们还通过在改良的薄膜润滑方程中使用相似性参数来获得通用桥梁的轮廓。

Recent investigations on the coalescence of polymeric droplets on a solid substrate have reported strong disagreements; the heart of the issue is whether coalescence of polymeric drops is similar to that of Newtonian fluid and is independent of molecular relaxation, or whether the role of entanglement of polymeric chains leads to a transition kinetics different from that of Newtonian fluid. Via this report, we resolve the disagreements through a discussion on the effects of merging method on the dominant forces governing the coalescence process, i.e., inertia, dissipation, and relaxation. Our study unveils that the coalescence dynamics of polymeric drops is not universal and in fact, it is contingent of the method by which the coalescence is triggered. Additionally, we demonstrate the spatial features of the bridge at different time instants by a similarity analysis. We also theoretically obtain a universal bridge profile by employing the similarity parameter in a modified thin film lubrication equation for polymeric fluids.

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