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arXiv 2008.13029physics.flu-dyncond-mat.mtrl-sci
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部分冻结二元液滴撞击冷表面时的斑图形成

Pattern formation during the impact of a partially-frozen binary droplet on a cold surface

Pallav Kant, Henrik Müller-Groeling, Detlef Lohse

摘要:

液滴在过冷表面上的撞击是一种复杂的现象,因为它同时引发了几个物理过程,涵盖了广泛的传输现象和相变。在这里,我们报告和解释一个意想不到的,但高度相关的现象指状生长的固相。它出现在一个二元液滴的影响,从外面冻结之前的过冷表面上的影响。我们建立了在前进的接触线的预固化材料的存在下,从根本上改变了所得到的动态,即通过修改局部流动性,导致类似于粘性指进的不稳定性。此外,我们描绘的界面变形的影响液滴和图案化的固相生长之间的相互作用,断开模式出现在更快的影响。

英文摘要:

Impact of a droplet on an undercooled surface is a complex phenomenon as it simultaneously instigates several physical processes that cover a broad spectrum of transport phenomena and phase-transition. Here, we report and explain an unexpected but highly relevant phenomenon of fingered growth of the solid-phase. It emerges during the impact of a binary droplet that freezes from the outside prior to the impact on the undercooled surface. We establish that the presence of pre-solidified material at the advancing contact line fundamentally changes the resulting dynamics, namely by modifying the local flow mobility that leads to an instability analogous to viscous fingering. Moreover, we delineate the interplay between the interfacial deformations of the impacting droplet and patterned growth of the solid-phase as disconnected patterns emerge at faster impacts.

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