Bubble dynamics in thin liquid films and breakup at drop impact,Soft Matter

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Bubble dynamics in thin liquid films and breakup at drop impact
Soft Matter ( IF 2.9 ) Pub Date : 2020-11-11 , DOI: 10.1039/d0sm01882a
Elizaveta Ya. Gatapova _{1,

2,

2,

3,

4} , Kyunney B. Gatapova _{3,

5,

6,

7}

Affiliation

A liquid drop impacting on a smooth surface heated above the boiling point and below the Leidenfrost temperature spreads over the surface forming a thin liquid film. We observed bubble nuclei originating at the first contact of a liquid with a heated sapphire surface, and the formation of a thin liquid film with one layer of microbubbles. In the present paper, we describe in detail the bubble dynamics for the substrate temperature ranging from 130 to 170 °C. The thickness of the liquid film is estimated to vary within the range from 40 to 80 μm at We = 76 and an advancing contact angle of 76°. We have detected how bubbles break the film, which is followed by dry patch propagation and sessile droplet formation, and elucidated the mechanism of spontaneous liquid film breakup. The bubble coalescence and waves induced by the rollback flow from the lamella periphery or by reversible bubble bursting are the reason for irreversible hole formation.

中文翻译：

液膜中的气泡动力学和液滴撞击时破裂

液滴撞击加热到高于沸点和低于莱顿弗罗斯特温度的光滑表面，在表面上扩散形成薄的液膜。我们观察到气泡核起源于液体与加热的蓝宝石表面的第一次接触，并形成了一层带有一层微气泡的液体薄膜。在本文中，我们详细描述了基板温度在130至170°C范围内的气泡动力学。估计在We = 76且前进接触角为76°时，液膜的厚度在40至80μm的范围内变化。我们已经检测到气泡是如何破坏膜的，然后是干膜扩散和固着液滴的形成，并阐明了液体膜自发破裂的机理。

更新日期：2020-11-21

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