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Drop impact on thin powder layers: pattern formation by air entrapment.
Soft Matter ( IF 2.9 ) Pub Date : 2020-01-14 , DOI: 10.1039/c9sm01887e
Meenakshi Sharma 1 , Maheshwar Gopu , Jijo Easo George , Saumya Gupta , Dileep Mampallil
Affiliation  

Impact of drops on thin powder layers displaces the powder particles radially outward producing shallow craters with thick rims, for example, as observed on dust layers on the floor. Here, we report that the patterns formed on thin powder layers by drop impact are not limited to such crater-like ones. Instead, depending upon the layer properties, disc or disc-plus-ring shaped patterns are formed at the impact point. We show that air entrapment and micro-bubble formation during the drop impact result in the formation of such patterns. Based on high-speed imaging, scaling analyses, and measurements with various liquids and powder layers, we propose a mechanism for the formation of such patterns. The phenomenon that we report can open further investigations on drop impact on the granular matter.

中文翻译:

掉落在薄粉末层上的冲击:空气夹带形成图案。

液滴对薄粉末层的冲击使粉末颗粒径向向外移位,从而产生带有厚边沿的浅火山口,例如在地板上的灰尘层上观察到的那样。在这里,我们报道了通过液滴撞击在薄粉末层上形成的图案不限于这种坑状的图案。取而代之的是,取决于层的特性,在冲击点处形成了盘形或盘形环状图案。我们表明,在液滴撞击过程中空气的滞留和微气泡的形成导致了这种模式的形成。基于高速成像,缩放分析以及对各种液体和粉末层的测量,我们提出了形成这种图案的机制。我们报告的现象可以进一步研究液滴对颗粒物的影响。
更新日期:2020-02-13
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