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arXiv 1209.4983cond-mat.softcond-mat.mes-hallcond-mat.mtrl-sciphysics.flu-dyn
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超越坦纳定律:粘性液滴在同一膜上的扩散状态之间的交叉

Beyond Tanner's Law: Crossover between Spreading Regimes of a Viscous Droplet on an Identical Film

Sara L. Cormier, Joshua D. McGraw, Thomas Salez, Elie Raphael, Kari Dalnoki-Veress

摘要:

我们目前的结果,从相同的材料制备的薄膜上的聚合物微滴的流平。特别是,我们探讨了从无限小的薄膜(坦纳定律制度)上的液滴扩散到比液滴本身更厚的膜上的液滴流平的交叉。在这两种制度中,液滴的过量表面积朝向平坦液膜的平衡配置减小,但在时间上具有不同的幂律。此外,特征流平时间取决于分子性质、液滴的大小和底层膜的厚度。膜内的流动使得该系统与在固体表面上扩散的液滴根本不同。因此,我们开发了一个理论模型的基础上薄膜流体力学,定量描述了所观察到的两个平整制度之间的交叉。

英文摘要:

We present results on the leveling of polymer microdroplets on thin films prepared from the same material. In particular, we explore the crossover from a droplet spreading on an infinitesimally thin film (Tanner's law regime) to that of a droplet leveling on a film thicker than the droplet itself. In both regimes, the droplet's excess surface area decreases towards the equilibrium configuration of a flat liquid film, but with a different power law in time. Additionally, the characteristic leveling time depends on molecular properties, the size of the droplet, and the thickness of the underlying film. Flow within the film makes this system fundamentally different from a droplet spreading on a solid surface. We thus develop a theoretical model based on thin film hydrodynamics that quantitatively describes the observed crossover between the two leveling regimes.

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