粘性珍珠的双方式动态
Auriane Huyghues Despointes1, Abhijit Kumar Kushwaha2, Jérôme Fresnais3
1Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, PSL Research University, École Supérieure de Physique et Chimie Industrielles-Paris, Paris 75005, France.
概括
超级排斥表面上的粘性滴滴表现出意想不到的超快速运动. 这种现象发生在空气形成时,使水滴能够快速滑动,而不依赖粘度.
科学领域:
- 表面科学和部落学.
- 流体动力学 流体动力学
- 材料科学 材料科学 材料科学
背景情况:
- 超级驱逐表面上的滴滴通常会采用移动的,类似珍珠的形状,这是由于接触线的固定度低,动态摩擦最小.
- 这种高流动性对粘性液滴特别有利,在这种情况下,超级排斥力有望减少与粘度相关的摩擦.
研究的目的:
- 在高度排斥的斜坡上研究粘性滴滴的运动动态.
- 为了识别和表征一种新的超快速滴滴运动模式.
- 要了解使这种超快滑翔成为可能的潜在机制.
主要方法:
- 在倾斜的超级排斥表面上对粘性滴滴下降的实验观测.
- 分析滴滴沉积方法以识别不同的运动模式.
- 在滴下面的滑空气膜 (厚度,发作) 的特征.
- 在不同类型的表面 (从超水到水) 上测试滴水的行为.
主要成果:
- 粘性滴滴表现出两种下降模式:一个标准的快速速度和一个显著更快的"超快"模式 (30-60倍更快).
- 超快速运动归因于滴水和基板之间的微弱接触,允许动态的气形成.
- 这种空气滑使滴滴的滑动速度高且独立于粘度.
- 在超疏水表面上发起的超快速滴滴甚至在水友固体上保持速度和形状.
结论:
- 在超级排斥性表面上存在超快速滴滴运动模式,由动态空气滑驱动.
- 这种空气将液滴与基板脱,使其能够高速滑动,不依赖粘度.
- 观察到的现象对控制各种应用中的滴滴运输有影响,甚至在不同的表面化学物质上.
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